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About 1 in 6,250 babies are born with Horner syndrome. The incidence of Horner syndrome that appears later is unknown, but it is considered an uncommon disorder.
These resources address the diagnosis or management of renal tubular acidosis with deafness: - Genetic Testing Registry: Renal tubular acidosis with progressive nerve deafness - MedlinePlus Encyclopedia: Audiometry - MedlinePlus Encyclopedia: Kidney Function Tests These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
People normally have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Females typically have two X chromosomes (46,XX), and males have one X chromosome and one Y chromosome (46,XY). 47,XYY syndrome is caused by the presence of an extra copy of the Y chromosome in each of a male's cells. As a result of the extra Y chromosome, each cell has a total of 47 chromosomes instead of the usual 46. It is unclear why an extra copy of the Y chromosome is associated with tall stature, learning problems, and other features in some boys and men. Some males with 47,XYY syndrome have an extra Y chromosome in only some of their cells. This phenomenon is called 46,XY/47,XYY mosaicism.
If left untreated, tabes dorsalis can lead to paralysis, dementia, and blindness. Existing nerve damage cannot be reversed.
ARVC occurs in an estimated 1 in 1,000 to 1 in 1,250 people. This disorder may be underdiagnosed because it can be difficult to detect in people with mild or no symptoms.
Larsen syndrome is a condition that causes abnormal development of the bones. Signs and symptoms may include clubfoot and numerous joint dislocations at birth (affecting the hips, knees and elbows); flexible joints; and a distinctive appearance of the face, hands and feet. Larsen syndrome is inherited in an autosomal dominant manner and is caused by mutations in the FLNB gene. Management may include surgeries (especially for hip dislocation), and physiotherapy.
These resources address the diagnosis or management of dentinogenesis imperfecta: - Genetic Testing Registry: Dentinogenesis imperfecta - Shield's type II - Genetic Testing Registry: Dentinogenesis imperfecta - Shield's type III - MedlinePlus Encyclopedia: Tooth - abnormal colors These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
How is cold urticaria diagnosed? A diagnosis of cold urticaria is typically suspected based on the presence of characteristic signs and symptoms. Additional testing can then be ordered to confirm the diagnosis and determine if there are other associated conditions. This generally involves a cold simulation test in which a cold object (such as an ice cube) is applied against the skin of the forearm for 1-5 minutes. In people affected by cold urticaria, a distinct red and swollen rash will generally develop within minutes of exposure. A complete blood count and/or metabolic tests may also be performed to determine associated diseases.
What are the symptoms of cat scratch disease? Most people with cat scratch disease have been bitten or scratched by a cat and developed a mild infection at the point of injury. Lymph nodes, especially those around the head, neck, and upper limbs, become swollen. Additionally, a person with cat scratch disease may experience fever, headache, fatigue, achiness and discomfort (malaise), sore throat, enlarged spleen, and/or loss of appetite.
Mutations in the COL7A1 gene cause all three major forms of dystrophic epidermolysis bullosa. This gene provides instructions for making a protein that is used to assemble type VII collagen. Collagens are molecules that give structure and strength to connective tissues, such as skin, tendons, and ligaments, throughout the body. Type VII collagen plays an important role in strengthening and stabilizing the skin. It is the main component of structures called anchoring fibrils, which anchor the top layer of skin, called the epidermis, to an underlying layer called the dermis. COL7A1 mutations alter the structure or disrupt the production of type VII collagen, which impairs its ability to help connect the epidermis to the dermis. When type VII collagen is abnormal or missing, friction or other minor trauma can cause the two skin layers to separate. This separation leads to the formation of blisters, which can cause extensive scarring as they heal. Researchers are working to determine how abnormalities of type VII collagen also underlie the increased risk of skin cancer seen in the severe form of dystrophic epidermolysis bullosa.
5-alpha reductase deficiency is a condition that affects male sexual development before birth and during puberty. People with this condition are genetically male, with one X and one Y chromosome in each cell, and they have male gonads (testes). Their bodies, however, do not produce enough of a hormone called dihydrotestosterone (DHT). DHT has a critical role in male sexual development, and a shortage of this hormone disrupts the formation of the external sex organs before birth. Many people with 5-alpha reductase deficiency are born with external genitalia that appear female. In other cases, the external genitalia do not look clearly male or clearly female (sometimes called ambiguous genitalia). Still other affected infants have genitalia that appear predominantly male, often with an unusually small penis (micropenis) and the urethra opening on the underside of the penis (hypospadias). During puberty, people with this condition develop some secondary sex characteristics, such as increased muscle mass, deepening of the voice, development of pubic hair, and a growth spurt. The penis and scrotum (the sac of skin that holds the testes) grow larger. Unlike many men, people with 5-alpha reductase deficiency do not develop much facial or body hair. Most affected males are unable to father a child (infertile). Children with 5-alpha reductase deficiency are often raised as girls. About half of these individuals adopt a male gender role in adolescence or early adulthood.
GLUT1 deficiency syndrome is caused by mutations in the SLC2A1 gene. This gene provides instructions for producing a protein called the glucose transporter protein type 1 (GLUT1). The GLUT1 protein is embedded in the outer membrane surrounding cells, where it transports a simple sugar called glucose into cells from the blood or from other cells for use as fuel. In the brain, the GLUT1 protein is involved in moving glucose, which is the brain's main energy source, across the blood-brain barrier. The blood-brain barrier acts as a boundary between tiny blood vessels (capillaries) and the surrounding brain tissue; it protects the brain's delicate nerve tissue by preventing many other types of molecules from entering the brain. The GLUT1 protein also moves glucose between cells in the brain called glia, which protect and maintain nerve cells (neurons). SLC2A1 gene mutations reduce or eliminate the function of the GLUT1 protein. Having less functional GLUT1 protein reduces the amount of glucose available to brain cells, which affects brain development and function.
Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis (chance of recovery) and treatment options depend on: - Where the tumor has formed in the central nervous system (CNS). - Whether there are certain changes in the genes or chromosomes. - Whether any cancer cells remain after surgery to remove the tumor. - The type of ependymoma. - The age of the child when the tumor is diagnosed. - Whether the cancer has spread to other parts of the brain or spinal cord. - Whether the tumor has just been diagnosed or has recurred (come back). Prognosis also depends on the type and dose of radiation therapy that is given.
Donohue syndrome is estimated to affect less than 1 per million people worldwide. Several dozen cases have been reported in the medical literature.
Hereditary neuropathies are a group of inherited disorders affecting the peripheral nervous system. The hereditary neuropathies are divided into four major subcategories: hereditary motor and sensory neuropathy, hereditary sensory neuropathy, hereditary motor neuropathy, and hereditary sensory and autonomic neuropathy. The most common type is Charcot-Marie-Tooth disease, one of the hereditary motor and sensory neuropathies. Symptoms of the hereditary neuropathies vary according to the type and may include sensory symptoms such as numbness, tingling, and pain in the feet and hands; or motor symptoms such as weakness and loss of muscle bulk, particularly in the lower leg and feet muscles. Certain types of hereditary neuropathies can affect the autonomic nerves, resulting in impaired sweating, postural hypotension, or insensitivity to pain. Some people may have foot deformities such as high arches and hammer toes, thin calf muscles (having the appearance of an inverted champagne glass) or scoliosis (curvature of the spine). The symptoms of hereditary neuropathies may be apparent at birth or appear in middle or late life. They can vary among different family members, with some family members being more severely affected than others. The hereditary neuropathies can be diagnosed by blood tests for genetic testing, nerve conduction studies, and nerve biopsies.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Certain factors affect prognosis (chance of recovery and treatment options). The prognosis (chance of recovery) and treatment options depend on the following: - The type of cancer. - The size of the tumor. - The stage of cancer (whether it affects part of the ovary, involves the whole ovary, or has spread to other places in the body). - The way the cancer cells look under a microscope. - The patients general health. Ovarian germ cell tumors are usually cured if found and treated early.
If you have lupus, your immune system attacks healthy cells and tissues by mistake. This can damage your joints, skin, blood vessels and organs. There are many kinds of lupus. The most common type, systemic lupus erythematosus, affects many parts of the body. Discoid lupus causes a rash that doesn't go away. Subacute cutaneous lupus causes sores after being out in the sun. Another type can be caused by medication. Neonatal lupus, which is rare, affects newborns. Anyone can get lupus, but women are most at risk. Lupus is also more common in African American, Hispanic, Asian and Native American women. The cause of lupus is not known. Lupus has many symptoms. Some common ones are - Joint pain or swelling - Muscle pain - Fever with no known cause - Fatigue - Red rashes, often on the face (also called the "butterfly rash") There is no one test to diagnose lupus, and it may take months or years to make the diagnosis. There is no cure for lupus, but medicines and lifestyle changes can help control it. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
Peripheral arterial disease (P.A.D.) is a disease in which plaque (plak) builds up in the arteries that carry blood to your head, organs, and limbs. Plaque is made up of fat, cholesterol, calcium, fibrous tissue, and other substances in the blood. P.A.D. currently affects millions of Americans, and about 1 in every 20 Americans over the age of 50 has P.A.D.
Treatment is supportive and symptomatic. Individuals with the disorder often require tube feeding. Because COFS is genetic, genetic counseling is available.
Tremors are unintentional trembling or shaking movements in one or more parts of your body. Most tremors occur in the hands. You can also have arm, head, face, vocal cord, trunk, and leg tremors. Tremors are most common in middle-aged and older people, but anyone can have them. The cause of tremors is a problem in the parts of the brain that control muscles in the body or in specific parts of the body, such as the hands. They commonly occur in otherwise healthy people. They may also be caused by problems such as - Parkinson's disease - Dystonia - Multiple sclerosis - Stroke - Traumatic brain injury - Alcohol abuse and withdrawal - Certain medicines Some forms are inherited and run in families. Others have no known cause. There is no cure for most tremors. Treatment to relieve them depends on their cause. In many cases, medicines and sometimes surgical procedures can reduce or stop tremors and improve muscle control. Tremors are not life threatening. However, they can be embarrassing and make it hard to perform daily tasks. NIH: National Institute of Neurological Disorders and Stroke
If you have a balance disorder, you may stagger when you try to walk, or teeter or fall when you try to stand up. You might experience other symptoms such as - dizziness or vertigo (a spinning sensation) - falling or feeling as if you are going to fall - lightheadedness, faintness, or a floating sensation - blurred vision - confusion or disorientation. dizziness or vertigo (a spinning sensation) falling or feeling as if you are going to fall lightheadedness, faintness, or a floating sensation blurred vision confusion or disorientation. Other symptoms might include nausea and vomiting, diarrhea, changes in heart rate and blood pressure, and fear, anxiety, or panic. Symptoms may come and go over short time periods or last for a long time, and can lead to fatigue and depression.
Fragile XE syndrome is caused by mutations in the AFF2 gene. This gene provides instructions for making a protein whose function is not well understood. Some studies show that the AFF2 protein can attach (bind) to DNA and help control the activity of other genes. Other studies suggest that the AFF2 protein is involved in the process by which the blueprint for making proteins is cut and rearranged to produce different versions of the protein (alternative splicing). Researchers are working to determine which genes and proteins are affected by AFF2. Nearly all cases of fragile XE syndrome occur when a region of the AFF2 gene, known as the CCG trinucleotide repeat, is abnormally expanded. Normally, this segment of three DNA building blocks (nucleotides) is repeated approximately 4 to 40 times. However, in people with fragile XE syndrome, the CCG segment is repeated more than 200 times, which makes this region of the gene unstable. (When expanded, this region is known as the FRAXE fragile site.) As a result, the AFF2 gene is turned off (silenced), and no AFF2 protein is produced. It is unclear how a shortage of this protein leads to intellectual disability in people with fragile XE syndrome. People with 50 to 200 CCG repeats are said to have an AFF2 gene premutation. Current research suggests that people with a premutation do not have associated cognitive problems.
Niemann-Pick disease types A and B is caused by mutations in the SMPD1 gene. This gene provides instructions for producing an enzyme called acid sphingomyelinase. This enzyme is found in lysosomes, which are compartments within cells that break down and recycle different types of molecules. Acid sphingomyelinase is responsible for the conversion of a fat (lipid) called sphingomyelin into another type of lipid called ceramide. Mutations in SMPD1 lead to a shortage of acid sphingomyelinase, which results in reduced break down of sphingomyelin, causing this fat to accumulate in cells. This fat buildup causes cells to malfunction and eventually die. Over time, cell loss impairs function of tissues and organs including the brain, lungs, spleen, and liver in people with Niemann-Pick disease types A and B. Mutations in either the NPC1 or NPC2 gene cause Niemann-Pick disease type C. The proteins produced from these genes are involved in the movement of lipids within cells. Mutations in these genes lead to a shortage of functional protein, which prevents movement of cholesterol and other lipids, leading to their accumulation in cells. Because these lipids are not in their proper location in cells, many normal cell functions that require lipids (such as cell membrane formation) are impaired. The accumulation of lipids as well as the cell dysfunction eventually leads to cell death, causing the tissue and organ damage seen in Niemann-Pick disease types C1 and C2.
How is familial isolated hyperparathyroidism diagnosed? The diagnosis of familial isolated hyperparathyroidism (FIHP) is primarily a diagnosis of exclusion. This means that it is diagnosed when no symptoms or genetic features of other forms of familial hyperparathyroidism are present. FIHP may be the only feature of another condition that is not manifesting completely, or it may be a distinct condition due to mutations in genes that have not yet been identified. Clinical exams, laboratory tests, and histological (microscopic) findings are needed before making a diagnosis of FIHP. A diagnosis of FIHP may include the findings of: hypercalcemia (defined as a serum calcium level greater than 10.5 mg/dL) inappropriately high parathyroid hormone (PTH) concentrations parathyroid adenomas exclusion of multiple endocrine neoplasia type 1 (MEN 1) and hyperparathyroidism-jaw tumor syndrome (HPT-JT) In the majority of people with FIHP, genetic mutations are not found. However, in some people, mutations in the MEN1, CASR, and CDC73 (HRPT2) genes have been reported. At this time, no gene has been associated exclusively with FIHP.
Is non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency inherited? Non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency (NCAH) is inherited in an autosomal recessive manner. This means that to be affected, a person must have a mutation in both copies of the responsible gene in each cell. The parents of an affected person usually each carry one mutated copy of the gene and are referred to as carriers. Carriers typically do not show signs or symptoms of the condition. When two carriers of an autosomal recessive condition have children, each child has a 25% (1 in 4) risk to have the condition, a 50% (1 in 2) risk to be a carrier like each of the parents, and a 25% chance to not have the condition and not be a carrier.
Multiple mitochondrial dysfunctions syndrome (MMDS) is a severe condition that affects the energy-producing structures of cells (called the mitochondria). Signs and symptoms of this condition generally develop early in life and may include encephalopathy, hypotonia (poor muscle tone), seizures, developmental delay, failure to thrive, lactic acidosis and a variety of other health problems. Due to the severity of the condition, most affected babies do not live past infancy. MMDS can be caused by changes (mutations) in the NFU1 gene or the BOLA3 gene. In these cases, the condition is inherited in an autosomal recessive manner. Treatment is based on the signs and symptoms present in each person.
Histidinemia is an inherited condition characterized by elevated blood levels of the amino acid histidine, a building block of most proteins. Histidinemia is caused by the shortage (deficiency) of the enzyme that breaks down histidine. Histidinemia typically causes no health problems, and most people with elevated histidine levels are unaware that they have this condition. The combination of histidinemia and a medical complication during or soon after birth (such as a temporary lack of oxygen) might increase a person's chances of developing intellectual disability, behavioral problems, or learning disorders.
Osteoarthritis is the most common form of arthritis among older people. It affects hands, low back, neck, and weight-bearing joints such as knees, hips, and feet. Osteoarthritis occurs when cartilage, the tissue that cushions the ends of the bones within the joints, breaks down and wears away. This causes bones to rub together, causing pain, swelling, and loss of motion of the joint.
The treatment for nerve damage from diabetes is based on your symptoms. No treatment can reverse nerve damage; however, it can help you feel better. Your doctor might suggest taking low doses of medicines that both treat other health problems and help the pain of neuropathy. Some of these medicines include - antidepressants - anticonvulsants, or anti-seizure medicines Other treatment options include - creams or patches on your skin for burning pain - over-the-counter pain medicines - acupuncture, a form of pain treatment that uses needles inserted into your body at certain pressure points - physical therapy, which helps with muscle weakness and loss of balance - relaxation exercises, such as yoga - special shoes to fit softly around sore feet or feet that have changed shape Your doctor also can prescribe medicines to help with problems caused by nerve damage in other areas of your body, such as poor digestion, dizziness, sexual problems, and lack of bladder control. Stopping smoking and drinking alcoholic beverages also may help with symptoms.
Ascher syndrome is a rare condition characterized by a combination of episodic edemea or swelling of the eyelids (blepharochalasia), double lip, and nontoxic thyroid enlargement (goiter). The underlying cause of this condition is unknown. Most cases are sporadic, but familial cases suggestive of autosomal dominant inheritance have also been reported. The condition is often undiagnosed due to its rarity. Treatment may include surgical excision of the double lip and/or surgery for eyelid edema.
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.
Mutations in the HMGCL gene cause HMG-CoA lyase deficiency. The HMGCL gene provides instructions for making an enzyme known as 3-hydroxymethyl-3-methylglutaryl-coenzyme A lyase (HMG-CoA lyase). This enzyme plays a critical role in breaking down dietary proteins and fats for energy. Specifically, it is responsible for processing leucine, an amino acid that is part of many proteins. HMG-CoA lyase also produces ketones during the breakdown of fats. Ketones are compounds that certain organs and tissues, particularly the brain, use for energy when the simple sugar glucose is not available. For example, ketones are important sources of energy during periods of fasting. If a mutation in the HMGCL gene reduces or eliminates the activity of HMG-CoA lyase, the body is unable to process leucine or make ketones properly. When leucine is not processed normally, a buildup of chemical byproducts called organic acids can result in metabolic acidosis. A shortage of ketones often leads to hypoglycemia. Metabolic acidosis and hypoglycemia can damage cells, particularly in the brain, resulting in serious illness in children with HMG-CoA lyase deficiency.
Significant exposure to asbestos fibers causes asbestos-related lung diseases. "Significant" usually means you were exposed for at least several months to visible dust from the fibers. Asbestos fibers are very small. When you breathe in, they can get stuck deep in your lungs. The fibers remain in your lung tissue for a long time and may cause scarring and inflammation. This can lead to pleural plaque and widespread pleural thickening, pleural effusion, asbestosis, lung cancer, or mesothelioma. Generally, asbestos-related lung diseases develop 10 to 40 or more years after a person has been exposed to asbestos. Being around products that contain asbestos isn't a danger, as long as the asbestos is enclosed. This prevents the fibers from getting into the air.
A congenital heart defect is a problem with the structure of the heart. It is present at birth. Congenital heart defects are the most common type of birth defect. The defects can involve the walls of the heart, the valves of the heart, and the arteries and veins near the heart. They can disrupt the normal flow of blood through the heart. The blood flow can slow down, go in the wrong direction or to the wrong place, or be blocked completely. Doctors use a physical exam and special heart tests to diagnose congenital heart defects. They often find severe defects during pregnancy or soon after birth. Signs and symptoms of severe defects in newborns include - Rapid breathing - Cyanosis - a bluish tint to the skin, lips, and fingernails - Fatigue - Poor blood circulation Many congenital heart defects cause few or no signs and symptoms. They are often not diagnosed until children are older. Many children with congenital heart defects don't need treatment, but others do. Treatment can include medicines, catheter procedures, surgery, and heart transplants. The treatment depends on the type of the defect, how severe it is, and a child's age, size, and general health. NIH: National Heart, Lung, and Blood Institute
During the first three stages of diabetic retinopathy, no treatment is needed, unless you have macular edema. To prevent progression of diabetic retinopathy, people with diabetes should control their levels of blood sugar, blood pressure, and blood cholesterol. Proliferative retinopathy is treated with laser surgery. This procedure is called scatter laser treatment. Scatter laser treatment helps to shrink the abnormal blood vessels. Your doctor places 1,000 to 2,000 laser burns in the areas of the retina away from the macula, causing the abnormal blood vessels to shrink. Because a high number of laser burns are necessary, two or more sessions usually are required to complete treatment. Although you may notice some loss of your side vision, scatter laser treatment can save the rest of your sight. Scatter laser treatment may slightly reduce your color vision and night vision. If the bleeding is severe, you may need a surgical procedure called a vitrectomy. During a vitrectomy, blood is removed from the center of your eye.
Our understanding of central cord syndrome has increased greatly in recent decades as a result of research funded conducted by the National Institute of Neurological Disorders and Stroke (NINDS). Much of this research focuses on finding better ways to prevent, treat, and ultimately cure neurological disorders such as central cord syndrome.
Summary : MRSA stands for methicillin-resistant Staphylococcus aureus. It causes a staph infection (pronounced "staff infection") that is resistant to several common antibiotics. There are two types of infection. Hospital-associated MRSA happens to people in healthcare settings. Community-associated MRSA happens to people who have close skin-to-skin contact with others, such as athletes involved in football and wrestling. Infection control is key to stopping MRSA in hospitals. To prevent community-associated MRSA - Practice good hygiene - Keep cuts and scrapes clean and covered with a bandage until healed - Avoid contact with other people's wounds or bandages - Avoid sharing personal items, such as towels, washcloths, razors, or clothes - Wash soiled sheets, towels, and clothes in hot water with bleach and dry in a hot dryer If a wound appears to be infected, see a health care provider. Treatments may include draining the infection and antibiotics. NIH: National Institute of Allergy and Infectious Diseases
Parry-Romberg syndrome is a rare disorder characterized by slowly progressive deterioration (atrophy) of the skin and soft tissues of half of the face (hemifacial atrophy), usually the left side. It is more common in females than in males. Initial facial changes usually involve the tissues above the upper jaw (maxilla) or between the nose and the upper corner of the lip (nasolabial fold) and subsequently progress to the angle of the mouth, areas around the eye, the brow, the ear, and the neck. The deterioration may also affect the tongue, the soft and fleshy part of the roof of the mouth, and the gums. The eye and cheek of the affected side may become sunken and facial hair may turn white and fall out (alopecia). In addition, the skin overlying affected areas may become darkly pigmented (hyperpigmentation) with, in some cases, areas of hyperpigmentation and patches of unpigmented skin (vitiligo). Parry-Romberg syndrome is also accompanied by neurological abnormalities including seizures and episodes of severe facial pain (trigeminal neuralgia). The onset of the disease usually begins between the ages of 5 and 15 years. The progression of the atrophy often lasts from 2 to 10 years, and then the process seems to enter a stable phase. Muscles in the face may atrophy and there may be bone loss in the facial bones. Problems with the retina and optic nerve may occur when the disease surrounds the eye.
Trichotillomania is an impulse control disorder characterized by an overwhelming urge to repeatedly pull out one's own hair (usually on the scalp), resulting in hair loss (alopecia). The eyelashes, eyebrows, and beard can also be affected. Many affected individuals feel extreme tension when they feel an impulse, followed by relief, gratification or pleasure afterwards. The condition may be mild and manageable, or severe and debilitating. Some individuals chew or swallow the hair they pull out (trichophagy), which can result in gastrointestinal problems. The exact cause of the condition is unknown. Treatment typically involves psychotherapy (including cognitive behavior therapy) and/or drug therapy, but these are not always effective.
MELAS can result from mutations in one of several genes, including MT-ND1, MT-ND5, MT-TH, MT-TL1, and MT-TV. These genes are found in the DNA of cellular structures called mitochondria, which convert the energy from food into a form that cells can use. Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA, known as mitochondrial DNA or mtDNA. Some of the genes related to MELAS provide instructions for making proteins involved in normal mitochondrial function. These proteins are part of a large enzyme complex in mitochondria that helps convert oxygen, fats, and simple sugars to energy. Other genes associated with this disorder provide instructions for making molecules called transfer RNAs (tRNAs), which are chemical cousins of DNA. These molecules help assemble protein building blocks called amino acids into full-length, functioning proteins within mitochondria. Mutations in a particular transfer RNA gene, MT-TL1, cause more than 80 percent of all cases of MELAS. These mutations impair the ability of mitochondria to make proteins, use oxygen, and produce energy. Researchers have not determined how changes in mtDNA lead to the specific signs and symptoms of MELAS. They continue to investigate the effects of mitochondrial gene mutations in different tissues, particularly in the brain.
Mutations in the B3GLCT gene cause Peters plus syndrome. The B3GLCT gene provides instructions for making an enzyme called beta 3-glucosyltransferase (B3Glc-T), which is involved in the complex process of adding sugar molecules to proteins (glycosylation). Glycosylation modifies proteins so they can perform a wider variety of functions. Most mutations in the B3GLCT gene lead to the production of an abnormally short, nonfunctional version of the B3Glc-T enzyme, which disrupts glycosylation. It is unclear how the loss of functional B3Glc-T enzyme leads to the signs and symptoms of Peters plus syndrome, but impaired glycosylation likely disrupts the function of many proteins, which may contribute to the variety of features.
Achromatopsia is a condition characterized by a partial or total absence of color vision. People with complete achromatopsia cannot perceive any colors; they see only black, white, and shades of gray. Incomplete achromatopsia is a milder form of the condition that allows some color discrimination. Achromatopsia also involves other problems with vision, including an increased sensitivity to light and glare (photophobia), involuntary back-and-forth eye movements (nystagmus), and significantly reduced sharpness of vision (low visual acuity). Affected individuals can also have farsightedness (hyperopia) or, less commonly, nearsightedness (myopia). These vision problems develop in the first few months of life. Achromatopsia is different from the more common forms of color vision deficiency (also called color blindness), in which people can perceive color but have difficulty distinguishing between certain colors, such as red and green.
Potocki-Shaffer syndrome (also known as proximal 11p deletion syndrome) is caused by a deletion of genetic material from the short (p) arm of chromosome 11 at a position designated 11p11.2. The size of the deletion varies among affected individuals. Studies suggest that the full spectrum of features is caused by a deletion of at least 2.1 million DNA building blocks (base pairs), also written as 2.1 megabases (Mb). The loss of multiple genes within the deleted region causes the varied signs and symptoms of Potocki-Shaffer syndrome. In particular, deletion of the EXT2, ALX4, and PHF21A genes are associated with several of the characteristic features of Potocki-Shaffer syndrome. Research shows that loss of the EXT2 gene is associated with the development of multiple osteochondromas in affected individuals. Deletion of another gene, ALX4, causes the enlarged parietal foramina found in people with this condition. In addition, loss of the PHF21A gene is the cause of intellectual disability and distinctive facial features in many people with the condition. The loss of additional genes in the deleted region likely contributes to the other features of Potocki-Shaffer syndrome.
Lamellar ichthyosis is a condition that mainly affects the skin. Infants with this condition are typically born with a tight, clear sheath covering their skin called a collodion membrane. This membrane usually dries and peels off during the first few weeks of life, and then it becomes obvious that affected babies have scaly skin, and eyelids and lips that are turned outward. People with lamellar ichthyosis typically have large, dark, plate-like scales covering their skin on most of their body. Infants with lamellar ichthyosis may develop infections, an excessive loss of fluids (dehydration), and respiratory problems. Affected individuals may also have hair loss (alopecia), abnormally formed fingernails and toenails (nail dystrophy), a decreased ability to sweat (hypohidrosis), an increased sensitivity to heat, and a thickening of the skin on the palms of the hands and soles of the feet (keratoderma). Less frequently, affected individuals have reddened skin (erythema) and joint deformities (contractures).
The National Institute of Neurological Disorders and Stroke (NINDS) conducts TSC research in its laboratories at the National Institutes of Health (NIH) and also supports TSC research through grants to major medical institutions across the country. Scientists in one study are learning more about the genes that can cause TSC and the function of the proteins those genes produce. Another study focuses on two major brain disorders --autism and epilepsy -- that occur in children with TSC. Other scientists are trying to determine what causes skin tumors to develop in individuals with TSC and to find the molecular basis of these tumors. Scientists hope knowledge gained from their current research will improve the genetic test for TSC and lead to new avenues of treatment, methods of prevention, and, ultimately, a cure.
GM1 gangliosidosis is an inherited lysosomal storage disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord. The condition may be classified into three major types based on the general age that signs and symptoms first appear: classic infantile (type 1); juvenile (type 2); and adult onset or chronic (type 3). Although the types differ in severity, their features may overlap significantly. GM1 gangliosidosis is caused by mutations in the GLB1 gene and is inherited in an autosomal recessive manner. Treatment is currently symptomatic and supportive.
Is dextrocardia with situs inversus inherited? In most cases of dextrocardia with situs inversus, a specific genetic cause has not been identified and inheritance patterns have not been confirmed. However, approximately 25% of affected people have primary ciliary dyskinesia, which is typically inherited in an autosomal recessive manner. This means that to be affected, a person must have a mutation in both copies of the responsible gene in each cell. The parents of an affected person usually each carry one mutated copy of the gene and are referred to as carriers. Carriers typically do not show signs or symptoms of the condition. When two carriers of an autosomal recessive condition have children, each child has a 25% (1 in 4) risk to have the condition, a 50% (1 in 2) risk to be a carrier like each of the parents, and a 25% chance to not have the condition and not be a carrier.
Cohen syndrome is an inherited disorder that affects many parts of the body and is characterized by developmental delay, intellectual disability, small head size (microcephaly), and weak muscle tone (hypotonia). Other features include progressive nearsightedness (myopia), degeneration of the light-sensitive tissue at the back of the eye (retinal dystrophy), an unusually large range of joint movement (hypermobility), and distinctive facial features. Characteristic facial features include thick hair and eyebrows, long eyelashes, unusually-shaped eyes (down-slanting and wave-shaped), a bulbous nasal tip, a smooth or shortened area between the nose and the upper lip (philtrum), and prominent upper central teeth. The combination of the last two facial features results in an open-mouth appearance. The features of Cohen syndrome vary widely among affected individuals. Additional signs and symptoms in some individuals with this disorder include low levels of white blood cells (neutropenia), overly friendly behavior, and obesity that develops in late childhood or adolescence. When obesity is present, it typically develops around the torso, with the arms and legs remaining slender. Individuals with Cohen syndrome may also have narrow hands and feet, and slender fingers.
How might progressive hemifacial atrophy be treated?
Activated PI3K-delta syndrome is a disorder that impairs the immune system. Individuals with this condition often have low numbers of white blood cells (lymphopenia), particularly B cells and T cells. Normally, these cells recognize and attack foreign invaders, such as viruses and bacteria, to prevent infection. Beginning in childhood, people with activated PI3K-delta syndrome develop recurrent infections, particularly in the lungs, sinuses, and ears. Over time, recurrent respiratory tract infections can lead to a condition called bronchiectasis, which damages the passages leading from the windpipe to the lungs (bronchi) and can cause breathing problems. People with activated PI3K-delta syndrome may also have chronic active viral infections, commonly Epstein-Barr virus or cytomegalovirus infections. Another possible feature of activated PI3K-delta syndrome is abnormal clumping of white blood cells. These clumps can lead to enlarged lymph nodes (lymphadenopathy), or the white blood cells can build up to form solid masses (nodular lymphoid hyperplasia), usually in the moist lining of the airways or intestines. While lymphadenopathy and nodular lymphoid hyperplasia are noncancerous (benign), activated PI3K-delta syndrome also increases the risk of developing a form of cancer called B-cell lymphoma.
How might pseudohypoaldosteronism type 2 be treated? Pseudohypoaldosteronism may be treated with thiazide diuretics and dietary restriction of sodium.
How are syringomas treated? People with syringomas have a variety of treatment options, for example pulsed ablative laser (CO2 or erbium) or light electrocoagulation using a fine epilating needle. To learn more about these and other syringoma treatment options we recommend speaking with your healthcare provider.
These resources address the diagnosis or management of REN-related kidney disease: - Gene Review: Gene Review: Autosomal Dominant Tubulointerstitial Kidney Disease, REN-Related (ADTKD-REN) - Genetic Testing Registry: Hyperuricemic nephropathy, familial juvenile, 2 - MedlinePlus Encyclopedia: Hyperkalemia - MedlinePlus Encyclopedia: Renin These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
Summary : Playing sports can be fun, but it can also be dangerous if you are not careful. You can help prevent injuries by - Getting a physical to make sure you are healthy before you start playing your sport - Wearing the right shoes, gear, and equipment - Drinking lots of water - Warming up and stretching If you have already hurt yourself playing a sport, make sure you recover completely before you start up again. If possible, protect the injured part of your body with padding, a brace, or special equipment. When you do start playing again, start slowly.
Yes. Some complications from Paget's disease respond well to surgery. Joint replacement may be helpful in people with severe arthritis of the hip or knee. Surgery can also realign affected leg bones to reduce pain or help broken bones heal in a better position.
Many older people are victims of elder abuse. It is the mistreatment of an older person, usually by a caregiver. It can happen within the family. It can also happen in assisted living facilities or nursing homes. The mistreatment may be - Physical, sexual, or emotional abuse - Neglect or abandonment - Financial abuse - stealing of money or belongings Possible signs of elder abuse include unexplained bruises, burns, and injuries. There may also be bed sores and poor hygiene. The person may become withdrawn, agitated, and depressed. There may be a sudden change in the person's financial situation. Elder abuse will not stop on its own. Someone else needs to step in and help. If you think that an older person is in urgent danger, call 9-1-1. Otherwise, contact adult protective services. NIH: National Institute on Aging
This disorder is thought to affect approximately 1 in 35,000 to 50,000 newborns.
Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. It is a very common muscle problem. Muscle cramps can be caused by nerves that malfunction. Sometimes this malfunction is due to a health problem, such as a spinal cord injury or a pinched nerve in the neck or back. Other causes are - Straining or overusing a muscle - Dehydration - A lack of minerals in your diet or the depletion of minerals in your body - Not enough blood getting to your muscles Cramps can be very painful. Stretching or gently massaging the muscle can relieve this pain.
What causes fumarase deficiency? Mutations in the FH gene cause fumarase deficiency. The FH gene provides instructions for making an enzyme called fumarase, which participates in a series of reactions allowing cells to use oxygen and generate energy. Mutations in the FH gene disrupt the enzyme's ability to do its job. Disruption of the process that generates energy for cells is particularly harmful to cells in the developing brain, thus resulting in the signs and symptoms of fumarase deficiency.
The greatest potential danger posed by AVMs is hemorrhage. Most episodes of bleeding remain undetected at the time they occur because they are not severe enough to cause significant neurological damage. But massive, even fatal, bleeding episodes do occur. Whenever an AVM is detected, the individual should be carefully and consistently monitored for any signs of instability that may indicate an increased risk of hemorrhage. Individuals who are treated require brain imaging afterwards to evaluate if the AVM has been completely removed or destroyed. The risk of hemorrhage remains if some of the AVM persists despite treatment.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Phacomatosis pigmentovascularis (PPV) is a skin and blood vessel disorder that is present from birth. Common signs and symptoms include port wine stain and pigmentary lesions, such as melanocytic nevi or epidermal nevi. A variety of classification systems have been proposed for PPV, largely depending on what type of pigmentary lesion is present. Around half of individuals with PPV have systemic disease, meaning that body systems other than the skin are affected. Systemic symptoms can vary greatly from person to person. PPV is not inherited, but is thought to be caused by a genetic phenomenon called twin spotting.
Summary : Statins are drugs used to lower cholesterol. Your body needs some cholesterol to work properly. But if you have too much in your blood, it can stick to the walls of your arteries and narrow or even block them. If diet and exercise don't reduce your cholesterol levels, you may need to take medicine. Often, this medicine is a statin. Statins interfere with the production of cholesterol in your liver. They lower bad cholesterol levels and raise good cholesterol levels. This can slow the formation of plaques in your arteries. Statins are relatively safe for most people. But they are not recommended for pregnant patients or those with active or chronic liver disease. They can also cause serious muscle problems. Some statins also interact adversely with other drugs. You may have fewer side effects with one statin drug than another. Researchers are also studying the use of statins for other conditions. Food and Drug Administration
Dengue is an infection caused by a virus. You can get it if an infected mosquito bites you. Dengue does not spread from person to person. It is common in warm, wet areas of the world. Outbreaks occur in the rainy season. Dengue is rare in the United States. Symptoms include a high fever, headaches, joint and muscle pain, vomiting, and a rash. In some cases, dengue turns into dengue hemorrhagic fever, which causes bleeding from your nose, gums, or under your skin. It can also become dengue shock syndrome, which causes massive bleeding and shock. These forms of dengue are life-threatening. There is no specific treatment. Most people with dengue recover within 2 weeks. Until then, drinking lots of fluids, resting and taking non-aspirin fever-reducing medicines might help. People with the more severe forms of dengue usually need to go to the hospital and get fluids. To lower your risk when traveling to areas where dengue is found - Wear insect repellent with DEET - Wear clothes that cover your arms, legs and feet - Close unscreened doors and windows NIH: National Institute of Allergy and Infectious Diseases
Congenital dyserythropoietic anemia type 2 (CDA II) is an inherited blood disorder characterized by mild to severe anemia. It is usually diagnosed in adolescence or early adulthood. Many affected individuals have yellowing of the skin and eyes (jaundice) and an enlarged liver and spleen (hepatosplenomegaly) and gallstones. This condition also causes the body to absorb too much iron, which builds up and can damage tissues and organs. In particular, iron overload can lead to an abnormal heart rhythm (arrhythmia), congestive heart failure, diabetes, and chronic liver disease (cirrhosis). Rarely, people with CDA type II have mediastinal tumors. CDA type II usually results from mutations in the SEC23B gene. It is inherited in an autosomal recessive pattern. Treatment depends on the severity of the symptoms and may involve blood transfusions, iron chelation therapy and removal of the spleen and gallbladder.
What causes craniopharyngioma? Craniopharyngiomas are thought to arise from epithelial remnants of the craniopharyngeal duct or Rathke's pouch (adamantinomatous type tumours) or from metaplasia of squamous epithelial cell rests that are remnants of the part of the stomadeum that contributed to the buccal mucosa (squamous papillary type tumours).
How is pityriasis lichenoides et varioliformis acuta diagnosed? A diagnosis of pityriasis lichenoides et varioliformis acuta is often suspected based on characteristic signs and symptoms. A skin biopsy can be used to confirm the diagnosis. Additional laboratory testing may be ordered to investigate a possible cause such as an associated infection.
Biliary atresia is rare and only affects about one out of every 18,000 infants.1 The disease is more common in females, premature babies, and children of Asian or African American heritage.
Is branchiootorenal syndrome inherited? Branchiootorenal syndrome may be inherited or occur sporadically. The inheritance pattern of branchiootorenal syndrome is autosomal dominant. Autosomal dominant inheritance is when one mutated copy of the gene that causes a disorder in each cell is needed for a person to be affected. Autosomal dominant conditions may occur for the first time in a person in a family due to a spontaneous gene mutation, or these conditions may be inherited from an affected parent. When a person with an autosomal dominant disorder has a child, there is a 50% chance that their child will inherit the condition.
Androgenetic alopecia is a common form of hair loss in both men and women. In men, this condition is also known as male-pattern baldness. Hair is lost in a well-defined pattern, beginning above both temples. Over time, the hairline recedes to form a characteristic "M" shape. Hair also thins at the crown (near the top of the head), often progressing to partial or complete baldness. The pattern of hair loss in women differs from male-pattern baldness. In women, the hair becomes thinner all over the head, and the hairline does not recede. Androgenetic alopecia in women rarely leads to total baldness. Androgenetic alopecia in men has been associated with several other medical conditions including coronary heart disease and enlargement of the prostate. Additionally, prostate cancer, disorders of insulin resistance (such as diabetes and obesity), and high blood pressure (hypertension) have been related to androgenetic alopecia. In women, this form of hair loss is associated with an increased risk of polycystic ovary syndrome (PCOS). PCOS is characterized by a hormonal imbalance that can lead to irregular menstruation, acne, excess hair elsewhere on the body (hirsutism), and weight gain.
NFJS/DPR is a rare condition; its prevalence is unknown. Only a few affected families have been reported in the medical literature.
What causes nonspherocytic hemolytic anemia due to hexokinase deficiency? Nonspherocytic hemolytic anemia due to hexokinase deficiency has been shown to be caused by mutations in the HK1 gene, which cause at least a partial deficiency of the enzyme hexokinase. This enzyme plays an important role in the chemical processes involved in the breakdown of sugar molecules (glycolysis). Red blood cells depend on this process for energy; if an enzyme is defective in any one of the stages, the red blood cell cannot function properly and hemolysis takes place. When red blood cells cannot be replaced faster than they destroy themselves, anemia results.
The National Institute of Neurological Disorders and Stroke (NINDS) conducts and supports research related to hemifacial spams through grants to major research institutions across the country. Much of this research focuses on better ways to prevent, treat, and ultimately cure neurological disorders, such as hemifacial spasm.
These resources address the diagnosis or management of gastrointestinal stromal tumor: - American Cancer Society: Treating Gastrointestinal Stromal Tumor (GIST) - Cancer.Net: Gastrointestinal Stromal Tumor--Diagnosis - Genetic Testing Registry: Gastrointestinal stromal tumor These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
How might fibrolamellar carcinoma be treated? The standard treatment for fibrolamellar carcinoma (FLC) is surgical resection. Due to the rarity of the condition, there is limited information to support the use of other treatment options and there is no standard chemotherapy regimen. However, other treatments may be considered if surgical resection isn't an option. For example, liver transplantation may be considered in patients who are not candidates for partial resection (removing a portion of the liver). Medscape Reference's Web site offers more specific information on the treatment and management of FLC. Please click the link to access this resource.
Aminoacylase 1 deficiency is caused by mutations in the ACY1 gene. This gene provides instructions for making an enzyme called aminoacylase 1, which is involved in the breakdown of proteins when they are no longer needed. Many proteins in the body have an acetyl group attached to one end. This modification, called N-acetylation, helps protect and stabilize the protein. Aminoacylase 1 performs the final step in the breakdown of these proteins by removing the acetyl group from certain amino acids. The amino acids can then be recycled and used to build other proteins. Mutations in the ACY1 gene lead to an aminoacylase 1 enzyme with little or no function. Without this enzyme's function, acetyl groups are not efficiently removed from a subset of amino acids during the breakdown of proteins. The excess N-acetylated amino acids are released from the body in urine. It is not known how a reduction of aminoacylase 1 function leads to neurological problems in people with aminoacylase 1 deficiency.
Anencephaly is a condition that prevents the normal development of the brain and the bones of the skull. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. The neural tube is a layer of cells that ultimately develops into the brain and spinal cord. Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect. Because the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb. This exposure causes the nervous system tissue to break down (degenerate). As a result, people with anencephaly are missing large parts of the brain called the cerebrum and cerebellum. These brain regions are necessary for thinking, hearing, vision, emotion, and coordinating movement. The bones of the skull are also missing or incompletely formed. Because these nervous system abnormalities are so severe, almost all babies with anencephaly die before birth or within a few hours or days after birth.
How might relapsing polychondritis be treated? The primary goals of treatment for people with relapsing polychondritis (RP) are to relieve present symptoms and to preserve the structure of the affected cartilage. The main treatment for RP is corticosteroid therapy with prednisone to decrease the severity, frequency and duration of relapses. Higher doses are generally given during flares, while lower doses can typically be prescribed during periods of remission. Other medications reported to control symptoms include dapsone, colchicine, azathioprine, methotrexate, cyclophosphamide, hydroxychloroquine, cyclosporine and infliximab. People who develop severe heart or respiratory complications may require surgery. More detailed information about the management of RP is available on Medscape Reference's Web site and can be viewed by clicking here.
Symptoms Can Be Controlled With proper treatment, most people with gout are able to control their symptoms and live productive lives. The goals for treatment are to ease the pain that comes from sudden attacks, prevent future attacks, stop uric acid buildup in the tissues and joint space between two bones, and prevent kidney stones from forming. Common Treatments The most common treatments for an attack of gout are high doses of non-steroidal anti-inflammatory drugs (NSAIDs) which are taken by mouth, or corticosteroids, which are taken by mouth or injected into the affected joint. Patients often begin to improve within a few hours of treatment. The attack usually goes away completely within a week or so. Several NSAIDs are available over the counter. It is important to check with your doctor concerning the safety of using these drugs and to verify the proper dosage. When NSAIDs or corticosteroids fail to control pain and swelling, the doctor may use another drug, colchicine. This drug is most effective when taken within the first 12 hours of an acute attack. For patients who have repeated gout attacks, the doctor may prescribe medicine such as allupurinol, febuxostat, or probenecid to lower uric acid levels. In severe cases of gout that do not respond to other treatments, pegloticase, a medicine administered by intravenous infusion, may be prescribed to reduce levels of uric acid.
Dry mouth is the condition of not having enough saliva, or spit, to keep your mouth wet. Everyone has dry mouth once in a while -- if they are nervous, upset, or under stress. But if you have dry mouth all or most of the time, it can be uncomfortable and lead to serious health problems. Though many older adults have dry mouth, it is not a normal part of aging. (Watch the video to learn more about dry mouth. To enlarge the video, click the brackets in the lower right-hand corner. To reduce the video, press the Escape (Esc) button on your keyboard.)
Most cases of preeclampsia do not seem to be inherited. The tendency to develop preeclampsia does seem to run in some families; however, the inheritance pattern is unknown.
Pallister-Killian mosaic syndrome appears to be a rare condition, although its exact prevalence is unknown. This disorder may be underdiagnosed because it can be difficult to detect in people with mild signs and symptoms. As a result, most diagnoses are made in children with more severe features of the disorder. More than 150 people with Pallister-Killian mosaic syndrome have been reported in the medical literature.
Myocarditis is a condition that is characterized by inflammation of the heart muscle (myocardium). Some affected people have no noticeable symptoms of the condition. When present, signs and symptoms may include chest pain, abnormal heartbeat, shortness of breath, fatigue, signs of infection (i.e. fever, headache, sore throat, diarrhea), and leg swelling. Myocarditis can be caused by a variety of factors including infections (viral, bacterial, parasitic, and fungal), allergic reactions to certain medications, and exposure to certain chemicals. It can also be associated with other inflammatory conditions such as lupus, Wegener's granulomatosis, giant cell arteritis and Takayasu's arteritis. Most cases occur sporadically in people with no family history of the condition. Treatment aims to address the underlying cause of the condition. Medications and rarely, a heart transplant may be needed if the heart muscle becomes weak.
Otopalatodigital syndrome type 1 is a disorder primarily involving abnormalities in skeletal development. It is a member of a group of related conditions called otopalatodigital spectrum disorders, which also includes otopalatodigital syndrome type 2, frontometaphyseal dysplasia, and Melnick-Needles syndrome. In general, these disorders involve hearing loss caused by malformations in the tiny bones in the ears (ossicles), problems in the development of the roof of the mouth (palate), and skeletal abnormalities involving the fingers and/or toes (digits). Otopalatodigital syndrome type 1 is usually the mildest of the otopalatodigital spectrum disorders. People with this condition usually have characteristic facial features including wide-set and downward-slanting eyes; prominent brow ridges; and a small, flat nose. Affected individuals also have hearing loss and chest deformities. They have abnormalities of the fingers and toes, such as blunt, square-shaped (spatulate) fingertips; shortened thumbs and big toes; and unusually long second toes. Affected individuals may be born with an opening in the roof of the mouth (a cleft palate). They may have mildly bowed limbs, and limited range of motion in some joints. People with otopalatodigital syndrome type 1 may be somewhat shorter than other members of their family. Males with this disorder often have more severe signs and symptoms than do females, who may show only the characteristic facial features.
Klver-Bucy syndrome is a rare behavioral impairment that is associated with damage to both of the anterior temporal lobes of the brain. It causes individuals to put objects in their mouths and engage in inappropriate sexual behavior. Other symptoms may include visual agnosia (inability to visually recognize objects), loss of normal fear and anger responses, memory loss, distractibility, seizures, and dementia. The disorder may be associated with herpes encephalitis and trauma, which can result in brain damage.
2q37 deletion syndrome is caused by a deletion of genetic material from a specific region in the long (q) arm of chromosome 2. The deletion occurs near the end of the chromosome at a location designated 2q37. The size of the deletion varies among affected individuals. The signs and symptoms of this disorder are probably related to the loss of multiple genes in this region.
Is genetic testing available for Coats disease? Genetic testing is not available for most cases of Coats disease. Eighty to 90% of affected people have no evidence of a genetic predisposition to the condition and no affected family members. Rarely, Coats disease can be inherited as a feature of several different genetic syndromes. For example, Coats disease has been reported in Senior-Loken syndrome, which is caused by changes (mutations) in one of several different genes, and Coats plus syndrome, which is caused by mutations in CTC1. Genetic testing is often an option for people affected by one of these conditions. How is Coats disease diagnosed? A diagnosis of Coats disease is often suspected based on the presense of characteristic signs and symptoms on thorough eye examination. Retinal fluorescein angiography, an imaging technique that uses a special dye and camera to look at blood flow in the retina, may be necessary to confirm the diagnosis. Ultrasonography, computed tomography (CT scan) and/or magnetic resonance imaging (MRI scan) are often performed to distinguish Coats disease from other conditions that affect the retina.
Wildervanck syndrome is a condition that occurs almost exclusively in females and affects the bones in the neck, the eyes, and the ears. It is characterized by Klippel-Feil anomaly (in which the bones of the neck fuse together), Duane syndrome (an eye movement disorder that is present from birth), and hearing loss. The cause of Wildervanck syndrome is unknown. In most cases, affected individuals have no family history of the condition.
Potassium aggravated myotonia is a group of diseases that causes tensing and stiffness (myotonia) of skeletal muscles, which are the muscles used for movement. The three types of potassium-aggravated myotonia include myotonia fluctuans, myotonia permanens, and acetazolamide-sensitive myotonia. Potassium aggravated myotonia is different from other types of myotonia because symptoms get worse when an affected individual eats food that is rich in potassium. Symptoms usually develop during childhood and vary, ranging from infrequent mild episodes to long periods of severe disease. Potassium aggravated myotonia is an inherited condition that is caused by changes (mutations) in the SCN4A gene. Treatment begins with avoiding foods that contain large amounts of potassium; other treatments may include physical therapy (stretching or massages to help relax muscles) or certain medications (such as mexiletine, carbamazapine, or acetazolamide).
These resources address the diagnosis or management of dermatofibrosarcoma protuberans: - American Cancer Society: How are Soft Tissue Sarcomas Diagnosed? - American Cancer Society: Treatment of Soft Tissue Sarcomas - Genetic Testing Registry: Dermatofibrosarcoma protuberans - National Cancer Institute: Adult Soft Tissue Sarcoma - National Cancer Institute: Targeted Cancer Therapies These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
These resources address the diagnosis or management of autosomal recessive axonal neuropathy with neuromyotonia: - Genetic Testing Registry: Gamstorp-Wohlfart syndrome These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
Dysgraphia is a neurological disorder characterized by writing disabilities. Specifically, the disorder causes a person's writing to be distorted or incorrect. In children, the disorder generally emerges when they are first introduced to writing. They make inappropriately sized and spaced letters, or write wrong or misspelled words, despite thorough instruction. Children with the disorder may have other learning disabilities; however, they usually have no social or other academic problems. Cases of dysgraphia in adults generally occur after some trauma. In addition to poor handwriting, dysgraphia is characterized by wrong or odd spelling, and production of words that are not correct (i.e., using "boy" for "child"). The cause of the disorder is unknown, but in adults, it is usually associated with damage to the parietal lobe of the brain.
What are the signs and symptoms of Myelofibrosis? The Human Phenotype Ontology provides the following list of signs and symptoms for Myelofibrosis. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms. Signs and Symptoms Approximate number of patients (when available) Autosomal dominant inheritance - Myelofibrosis - Myeloproliferative disorder - The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature. The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined. Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.
What are the signs and symptoms of Pontocerebellar hypoplasia type 5? The Human Phenotype Ontology provides the following list of signs and symptoms for Pontocerebellar hypoplasia type 5. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms. Signs and Symptoms Approximate number of patients (when available) Autosomal recessive inheritance - Microcephaly - Olivopontocerebellar hypoplasia - Seizures - The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature. The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined. Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.
Researchers are working to develop drugs called "molecularly targeted agents" which kill cancer cells by targeting key molecules involved in cancer cell growth.
Schinzel-Giedion syndrome is very rare, although the exact prevalence is unknown.
- Gas is air in the digestive tract. - Everyone has gas. Burping and passing gas are normal. - Gas in the digestive tract is usually caused by swallowing air and the breakdown of certain foods in the large intestine. - Most foods that contain carbohydrates can cause gas. - Foods that cause gas for one person may not cause gas for someone else. - The most common symptoms of gas are burping, passing gas, bloating, and abdominal pain or discomfort. - Swallowing less air and changing what you eat can help prevent or reduce gas. - Some over-the-counter medicines can help reduce gas.
What are the signs and symptoms of human T-cell leukemia virus, type 1? Human T-cell leukemia virus, type 1 (HTLV-1) generally causes no signs or symptoms. However, some affected people may later develop adult T-cell leukemia (ATL), HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP) or other medical conditions. Approximately 2-5% of people with HTLV-1 will develop ATL, a cancer of the T-cells (a type of white blood cell). The signs and symptoms of this condition and the disease progression vary from person to person. Affected people may have the following features: Fatigue Lymphadenopathy (swollen lymph nodes) Thirst Nausea and vomiting Fever Skin and bone abnormalities Enlarged liver and/or spleen Frequent infections Roughly .25-2% of people with HTLV-1 will develop HAM/TSP, a chronic, progressive disease of the nervous system. Signs and symptoms of this condition vary but may include: Progressive weakness Stiff muscles Muscle spasms Backache 'Weak' bladder Constipation
Lamellar ichthyosis is a rare genetic condition that affects the skin. Infants affected by lamellar ichthyosis are generally born with a shiny, waxy layer of skin (called a collodian membrane) that is typically shed within the first two weeks of life. The skin beneath the collodian membrane is red and scaly. Other signs and symptoms of the condition may include ectropion, lips that turn outwards, hair loss, palmoplantar hyperkeratosis (thick skin on the palms of the hands and/or soles of the feet), nail abnormalities, dehydration and respiratory problems. Although the condition may be caused by changes (mutations) in one of several different genes, approximately 90% of cases are caused by mutations in the TGM1 gene. Lamellar ichthyosis is generally inherited in an autosomal recessive manner. Treatment is based on the signs and symptoms present in each person.