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Simple kidney cysts are abnormal, fluid-filled sacs that form in the kidneys. Simple kidney cysts are different from the cysts that develop when a person has polycystic kidney disease (PKD), which is a genetic disorder. Simple kidney cysts do not enlarge the kidneys, replace their normal structure, or cause reduced kidney function like cysts do in people with PKD. Simple kidney cysts are more common as people age. An estimated 25 percent of people 40 years of age and 50 percent of people 50 years of age have simple kidney cysts.1
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. In most cases, an affected person has one parent with the condition. As the altered ATXN3 gene is passed down from one generation to the next, the length of the CAG trinucleotide repeat often increases. A larger number of repeats is usually associated with an earlier onset of signs and symptoms. This phenomenon is called anticipation. Anticipation tends to be more prominent when the ATXN3 gene is inherited from a person's father (paternal inheritance) than when it is inherited from a person's mother (maternal inheritance). In rare cases, individuals have been reported with expanded CAG repeats on both copies of the ATXN3 gene in each cell. These people have more severe signs and symptoms than people with only one mutation, and features of the condition appear in childhood.
X-linked dominant chondrodysplasia punctata (CDPX2), also known as Conradi-Hnermann-Happle syndrome, is a rare form of skeletal dysplasia characterized by skeletal malformations, skin abnormalities, cataracts and short stature. The specific symptoms and severity of the disorder may vary greatly from one individual to another. CDPX2 is caused by mutations in the emopamil binding protein gene, EBP. In many cases, this mutation occurs randomly, for no apparent reason (i.e., new mutation). The condition is inherited as an X-linked dominant trait and occurs almost exclusively in females. Treatment of CDPX2 is directed toward the specific symptoms that present in each individual. Such treatment may require the coordinated efforts of a team of medical professionals, including physicians who diagnose and treat disorders of the skeleton, joints, muscles, and related tissues (orthopedists); skin specialists (dermatologists); eye specialists; and/or other health care professionals.
Spondyloperipheral dysplasia is one of a spectrum of skeletal disorders caused by mutations in the COL2A1 gene. This gene provides instructions for making a protein that forms type II collagen. This type of collagen is found mostly in the clear gel that fills the eyeball (the vitreous) and in cartilage. Cartilage is a tough, flexible tissue that makes up much of the skeleton during early development. Most cartilage is later converted to bone, except for the cartilage that continues to cover and protect the ends of bones and is present in the nose and external ears. Type II collagen is essential for the normal development of bones and other connective tissues that form the body's supportive framework. Mutations in the COL2A1 gene interfere with the assembly of type II collagen molecules, reducing the amount of this type of collagen in the body. Instead of forming collagen molecules, the abnormal COL2A1 protein builds up in cartilage cells (chondrocytes). These changes disrupt the normal development of bones and other connective tissues, leading to the signs and symptoms of spondyloperipheral dysplasia.
The infection is usually diagnosed by identification of Paragonimus eggs in sputum. The eggs are sometimes found in stool samples (coughed-up eggs are swallowed). A tissue biopsy is sometimes performed to look for eggs in a tissue specimen. Specific and sensitive antibody tests based on P. westermani antigens are available through CDC, and serologic tests using a variety of techniques are available through commercial laboratories. More on: Resources for Health Professionals: Diagnosis More on: DPDx: Paragonimus
Mutations in the AMT and GLDC genes cause glycine encephalopathy. About 80 percent of cases of glycine encephalopathy result from mutations in the GLDC gene, while AMT mutations cause 10 percent to 15 percent of all cases. In a small percentage of affected individuals, the cause of this condition is unknown. The AMT and GLDC genes provide instructions for making proteins that work together as part of a larger enzyme complex. This complex, known as glycine cleavage enzyme, is responsible for breaking down glycine into smaller pieces. Mutations in either the AMT or GLDC gene prevent the complex from breaking down glycine properly. When glycine cleavage enzyme is defective, excess glycine can build up to toxic levels in the body's organs and tissues. Damage caused by harmful amounts of this molecule in the brain and spinal cord is responsible for the intellectual disability, seizures, and breathing difficulties characteristic of glycine encephalopathy.
X-linked infantile spasm syndrome is a seizure disorder characterized by a type of seizure known as infantile spasms. The spasms usually appear before the age of 1. Several types of spasms have been described, but the most commonly reported involves bending at the waist and neck with extension of the arms and legs (sometimes called a jackknife spasm). Each spasm lasts only seconds, but they occur in clusters several minutes long. Although individuals are not usually affected while they are sleeping, the spasms commonly occur just after awakening. Infantile spasms usually disappear by age 5, but many children then develop other types of seizures that recur throughout their lives. Most babies with X-linked infantile spasm syndrome have characteristic results on an electroencephalogram (EEG), a test used to measure the electrical activity of the brain. The EEG of these individuals typically shows an irregular pattern known as hypsarrhythmia, and this finding can help differentiate infantile spasms from other types of seizures. Because of the recurrent seizures, babies with X-linked infantile spasm syndrome stop developing normally and begin to lose skills they have acquired (developmental regression), such as sitting, rolling over, and babbling. Subsequently, development in affected children is delayed. Most affected individuals also have intellectual disability throughout their lives.
Granuloma annulare is a long-term (chronic) skin disease consisting of a rash with reddish bumps arranged in a circle or ring. The most commonly affected areas are the forearms, hands and feet. The lesions associated with granuloma annulare usually resolve without treatment. Strong steroids (applied as a cream or injection) are sometimes used to clear the rash more quickly. Most symptoms will disappear within 2 years (even without treatment), but recurrence is common. The underlying cause of granuloma annulare is unknown.
What causes esthestioneuroblastoma? The cause of esthesioneuroblastoma is currently unknown.
Yes. A number of medications may put people at risk for developing hyperuricemia and gout. They include - diuretics, which are taken to eliminate excess fluid from the body in conditions like hypertension, edema, and heart disease, and which decrease the amount of uric acid passed in the urine. (High levels of uric acid in the blood can lead to gout.) - salicylate-containing drugs, such as aspirin - niacin, a vitamin also known as nicotinic acid - cyclosporine, a medication that suppresses the bodys immune system (the system that protects the body from infection and disease). This medication is used in the treatment of some autoimmune diseases and to prevent the bodys rejection of transplanted organs. - levodopa, a medicine used in the treatment of Parkinsons disease. diuretics, which are taken to eliminate excess fluid from the body in conditions like hypertension, edema, and heart disease, and which decrease the amount of uric acid passed in the urine. (High levels of uric acid in the blood can lead to gout.) salicylate-containing drugs, such as aspirin niacin, a vitamin also known as nicotinic acid cyclosporine, a medication that suppresses the bodys immune system (the system that protects the body from infection and disease). This medication is used in the treatment of some autoimmune diseases and to prevent the bodys rejection of transplanted organs. levodopa, a medicine used in the treatment of Parkinsons disease.
This condition is inherited in an X-linked recessive pattern. A condition is considered X-linked if the mutated gene that causes the disorder is located on the X chromosome, one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), a mutation must be present in both copies of the gene to cause the disorder. Males are affected by X-linked recessive disorders much more frequently than females. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons. In X-linked recessive inheritance, a female with one altered copy of the gene in each cell is called a carrier. She can pass on the mutated gene, but usually does not experience signs and symptoms of the disorder. Carriers of SLC16A2 mutations have normal intelligence and do not experience problems with movement. Some carriers have been diagnosed with thyroid disease, a condition which is relatively common in the general population. It is unclear whether thyroid disease is related to SLC16A2 gene mutations in these cases.
Osteoporosis-pseudoglioma syndrome is inherited in an autosomal recessive pattern, which means both copies of the LRP5 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. However, some carriers may have decreased bone mineral density.
These resources address the diagnosis or management of recurrent hydatidiform mole: - American Cancer Society: Signs and Symptoms of Gestational Trophoblastic Disease - Genetic Testing Registry: Hydatidiform mole - Genetic Testing Registry: Hydatidiform mole, recurrent, 2 - MedlinePlus Encyclopedia: Choriocarcinoma - MedlinePlus Encyclopedia: Hydatidiform Mole 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
Phosphoglycerate mutase deficiency is caused by mutations in the PGAM2 gene. This gene provides instructions for making an enzyme called phosphoglycerate mutase, which is involved in a critical energy-producing process in cells known as glycolysis. During glycolysis, the simple sugar glucose is broken down to produce energy. The version of phosphoglycerate mutase produced from the PGAM2 gene is found primarily in skeletal muscle cells. Mutations in the PGAM2 gene greatly reduce the activity of phosphoglycerate mutase, which disrupts energy production in these cells. This defect underlies the muscle cramping and myoglobinuria that occur after strenuous exercise in affected individuals.
How might congenital anosmia be treated? Unfortunately, there is currently no known cure or treatment for congenital anosmia.
Fucosidosis is a rare condition; approximately 100 cases have been reported worldwide. This condition appears to be most prevalent in Italy, Cuba, and the southwestern United States.
Humans can become infected through tick bites or through contact with the blood, feces, or urine of an infected, sick, or dead animal – most commonly, rodents. Occupational and recreational activities such as hunting or trapping may increase human risk of infection. Transmission may also occur with no direct tick or rodent exposure as OHFV appears to be extremely stable in different environments. It has been isolated from aquatic animals and water and there is even evidence that OHFV can be transmitted through the milk of infected goats or sheep to humans. No human-to-human transmission of OHFV has been documented but infections due to lab contamination have been described.
Although the exact prevalence of succinate-CoA ligase deficiency is unknown, it appears to be very rare. This condition occurs more frequently among people from the Faroe Islands in the North Atlantic Ocean.
How might multicentric Castleman disease be treated? The treatment of multicentric Castleman disease (MCD) varies based on the severity of the condition and whether or not the patient has an HIV and/or human herpes virus type 8 (HHV-8) infection. Possible treatment options include: Immunotherapy can be used to block the action of the interleukin-6 (IL-6), a protein that is produced in excess by the immune system of people with MCD Chemotherapy may be recommended to slow the growth of lymphatic cells Corticosteroid medications can reduce inflammation Anti-viral drugs can block the activity of HHV-8 or HIV (in people who are infected by these viruses)
GPA is a rare disorder that affects an estimated 3 in 100,000 people in the United States.
Cancer begins in cells, which make up the blood and other tissues. Normally, cells grow, divide, and produce more cells as needed to keep the body healthy and functioning properly. Sometimes, however, the process of creating a new cell goes wrong -- cells become abnormal and form more cells in an uncontrolled way.
The prevalence of myofibrillar myopathy is unknown.
Miyoshi myopathy is a muscle disorder that primarily affects muscles away from the center of the body (distal muscles), such as those in the legs. During early to mid-adulthood, affected individuals typically begin to experience muscle weakness and wasting (atrophy) in one or both calves. If only one leg is affected, the calves appear different in size (asymmetrical). Calf weakness can make it difficult to stand on tiptoe. As Miyoshi myopathy slowly progresses, the muscle weakness and atrophy spread up the leg to the muscles in the thigh and buttock. Eventually, affected individuals may have difficulty climbing stairs or walking for an extended period of time. Some people with Miyoshi myopathy may eventually need wheelchair assistance. Rarely, the upper arm or shoulder muscles are mildly affected in Miyoshi myopathy. In a few cases, abnormal heart rhythms (arrhythmias) have developed. Individuals with Miyoshi myopathy have highly elevated levels of an enzyme called creatine kinase (CK) in their blood, which often indicates muscle disease.
The prevalence of Alpers-Huttenlocher syndrome is approximately 1 in 100,000 individuals.
Beare-Stevenson cutis gyrata syndrome is a rare genetic disorder; its incidence is unknown. Fewer than 20 people with this condition have been reported worldwide.
Spinocerebellar ataxia 2 (SCA2) is a progressive disorder that causes symptoms including uncoordinated movement (ataxia), speech and swallowing difficulties, muscle wasting, slow eye movement, and sometimes dementia. Signs and symptoms usually begin in mid-adulthood but can appear any time from childhood to late-adulthood. SCA2 is caused by mutations in the ATXN2 gene and is inherited in an autosomal dominant manner.
How might malignant eccrine spiradenoma be treated? Surgery to remove as much of the tumor as possible is usually the first step of treatment for malignant eccrine spiradenoma. Both a traditional surgical technique known as wide local excision and the newer Mohs micrographic surgery are thought to be effective for treating this cancer. Additional treatment may include radiation therapy to destroy any cancer cells that might remain after surgery. Though chemotherapy has been used in cases of malignant eccrine spiradenoma, it is thought to be of limited help in treating this disease.
The prevalence of distal hereditary motor neuropathy, type II is unknown. At least 25 affected families have been identified worldwide.
Stiff-person syndrome (SPS) is a rare neurological disorder with features of an autoimmune disease. SPS is characterized by fluctuating muscle rigidity in the trunk and limbs and a heightened sensitivity to stimuli such as noise, touch, and emotional distress, which can set off muscle spasms. Abnormal postures, often hunched over and stiffened, are characteristic of the disorder. People with SPS can be too disabled to walk or move, or they are afraid to leave the house because street noises, such as the sound of a horn, can trigger spasms and falls. SPS affects twice as many women as men. It is frequently associated with other autoimmune diseases such as diabetes, thyroiditis, vitiligo, and pernicious anemia. Scientists dont yet understand what causes SPS, but research indicates that it is the result of an autoimmune response gone awry in the brain and spinal cord. The disorder is often misdiagnosed as Parkinsons disease, multiple sclerosis, fibromyalgia, psychosomatic illness, or anxiety and phobia. A definitive diagnosis can be made with a blood test that measures the level of glutamic acid decarboxylase (GAD) antibodies in the blood. People with SPS have elevated levels of GAD, an antibody that works against an enzyme involved in the synthesis of an important neurotransmitter in the brain.
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.
16p11.2 deletion syndrome is considered to have an autosomal dominant inheritance pattern because a deletion in one copy of chromosome 16 in each cell is sufficient to cause the condition. However, most cases of 16p11.2 deletion syndrome are not inherited. The deletion occurs most often as a random event during the formation of reproductive cells (eggs and sperm) or in early fetal development. Affected people typically have no history of the disorder in their family, although they can pass the condition to their children. Several examples of inherited 16p11.2 deletion have been reported. In inherited cases, other family members may be affected as well.
IRAK-4 deficiency is caused by mutations in the IRAK4 gene, which provides instructions for making a protein that plays an important role in stimulating the immune system to respond to infection. The IRAK-4 protein is part of a signaling pathway that is involved in early recognition of foreign invaders (pathogens) and the initiation of inflammation to fight infection. This signaling pathway is part of the innate immune response, which is the body's early, nonspecific response to pathogens. Mutations in the IRAK4 gene lead to the production of a nonfunctional protein or no protein at all. The loss of functional IRAK-4 protein prevents the immune system from triggering inflammation in response to pathogens that would normally help fight the infections. Because the early immune response is insufficient, bacterial infections occur often and become severe and invasive.
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. At least 25 percent of Marfan syndrome cases result from a new mutation in the FBN1 gene. These cases occur in people with no history of the disorder in their family.
Vitiligo causes white patches on your skin. It can also affect your eyes, mouth, and nose. It occurs when the cells that give your skin its color are destroyed. No one knows what destroys them. It is more common in people with autoimmune diseases, and it might run in families. It usually starts before age 40. The white patches are more common where your skin is exposed to the sun. In some cases, the patches spread. Vitiligo can cause your hair to gray early. If you have dark skin, you may lose color inside your mouth. Using sunscreen will help protect your skin, and cosmetics can cover up the patches. Treatments for vitiligo include medicines, light therapy, and surgery. Not every treatment is right for everyone. Many have side effects. Some take a long time. Some do not always work. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
Multiple epiphyseal dysplasia (MED) is a group of disorders of cartilage and bone development, primarily affecting the ends of the long bones in the arms and legs (epiphyses). There are two types of MED, which are distinguished by their patterns of inheritance - autosomal dominant and autosomal recessive. Signs and symptoms may include joint pain in the hips and knees; early-onset arthritis; a waddling walk; and mild short stature as adults. Recessive MED may also cause malformations of the hands, feet, and knees; scoliosis; or other abnormalities. Most people are diagnosed during childhood, but mild cases may not be diagnosed until adulthood. Dominant MED is caused by mutations in the COMP, COL9A1, COL9A2, COL9A3, or MATN3 genes (or can be of unknown cause), and recessive MED is caused by mutations in the SLC26A2 gene.
The NINDS conducts and supports a wide range of studies that explore the complex systems of normal brain development, including neuronal migration. Recent studies have identified genes that are responsible for lissencephaly. The knowledge gained from these studies provides the foundation for developing treatments and preventive measures for neuronal migration disorders.
Your backbone, or spine, is made up of 26 bones called vertebrae. In between them are soft disks filled with a jelly-like substance. These disks cushion the vertebrae and keep them in place. As you age, the disks break down or degenerate. As they do, they lose their cushioning ability. This can lead to pain if the back is stressed. A herniated disk is a disk that ruptures. This allows the jelly-like center of the disk to leak, irritating the nearby nerves. This can cause sciatica or back pain. Your doctor will diagnose a herniated disk with a physical exam and, sometimes, imaging tests. With treatment, most people recover. Treatments include rest, pain and anti-inflammatory medicines, physical therapy, and sometimes surgery. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
Inguinal hernias can cause the following complications: - Incarceration. An incarcerated hernia happens when part of the fat or small intestine from inside the abdomen becomes stuck in the groin or scrotum and cannot go back into the abdomen. A health care provider is unable to massage the hernia back into the abdomen. - Strangulation. When an incarcerated hernia is not treated, the blood supply to the small intestine may become obstructed, causing strangulation of the small intestine. This lack of blood supply is an emergency situation and can cause the section of the intestine to die. Seek Immediate Care People who have symptoms of an incarcerated or a strangulated hernia should seek emergency medical help immediately. A strangulated hernia is a life-threatening condition. Symptoms of an incarcerated or a strangulated hernia include - extreme tenderness or painful redness in the area of the bulge in the groin - sudden pain that worsens quickly and does not go away - the inability to have a bowel movement and pass gas - nausea and vomiting - fever
The two kidneys are bean-shaped organs located just below the rib cage, one on each side of the spine. Everyday, the two kidneys filter about 120 to 150 quarts of blood to produce about 1 to 2 quarts of urine, composed of wastes and extra fluid. Blood enters the kidneys through arteries that branch inside the kidneys into tiny clusters of looping blood vessels. Each cluster is called a glomerulus, which comes from the Greek word meaning filter. The plural form of the word is glomeruli. There are approximately 1 million glomeruli, or filters, in each kidney. The glomerulus is attached to the opening of a small fluid-collecting tube called a tubule. Blood is filtered in the glomerulus, and extra fluid and wastes pass into the tubule and become urine. Eventually, the urine drains from the kidneys into the bladder through larger tubes called ureters. Each glomerulus-and-tubule unit is called a nephron. Each kidney is composed of about 1 million nephrons. In healthy nephrons, the glomerular membrane that separates the blood vessel from the tubule allows waste products and extra water to pass into the tubule while keeping blood cells and protein in the bloodstream.
Treatments your doctor will likely recommend before knee replacement include - exercises to strengthen the muscles around the knee and improve flexibility - weight loss, if needed, to reduce the load the knee must bear - walking aids such as canes to reduce stress on the joint - shoe inserts to improve the knees alignment - medicines to relieve pain. exercises to strengthen the muscles around the knee and improve flexibility weight loss, if needed, to reduce the load the knee must bear walking aids such as canes to reduce stress on the joint shoe inserts to improve the knees alignment medicines to relieve pain.
Here are some ways you can learn more about Alzheimers disease. - Talk with a doctor or other healthcare provider who specializes in Alzheimers disease. - Check out books or videos about Alzheimers from the library. - Go to educational programs about the disease. - Visit the website of the National Institute on Aging's Alzheimer's Disease and Referral Center (ADEAR). - The National Institute on Aging has a book, Caring for a Person with Alzheimers Disease, that can be viewed and ordered at www.nia.nih.gov/alzheimers/publication/caring-person-alzheimers-disease - Read about Alzheimer's disease on NIHSeniorHealth. Talk with a doctor or other healthcare provider who specializes in Alzheimers disease. Check out books or videos about Alzheimers from the library. Go to educational programs about the disease. Visit the website of the National Institute on Aging's Alzheimer's Disease and Referral Center (ADEAR). The National Institute on Aging has a book, Caring for a Person with Alzheimers Disease, that can be viewed and ordered at www.nia.nih.gov/alzheimers/publication/caring-person-alzheimers-disease Read about Alzheimer's disease on NIHSeniorHealth.
What are the signs and symptoms of Tiglic acidemia? The Human Phenotype Ontology provides the following list of signs and symptoms for Tiglic acidemia. 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) Acidosis - Aminoaciduria - Autosomal recessive inheritance - Episodic abdominal pain - Ketosis - 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.
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.
The purpose of treatment for polycythemia vera is to reduce the number of extra blood cells. Treatment of polycythemia vera may include the following: - Phlebotomy. - Chemotherapy with or without phlebotomy. - Biologic therapy using interferon alfa or pegylated interferon alpha. - Low-dose aspirin. Check the list of NCI-supported cancer clinical trials that are now accepting patients with polycythemia vera. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. Talk with your doctor about clinical trials that may be right for you. General information about clinical trials is available from the NCI website.
The incidence of Legg-Calv-Perthes disease varies by population. The condition is most common in white populations, in which it affects an estimated 1 to 3 in 20,000 children under age 15.
Throughout childhood, the risk of having a UTI is 2 percent for boys and 8 percent for girls. Having an anomaly of the urinary tract, such as urine reflux from the bladder back into the ureters, increases the risk of a UTI. Boys who are younger than 6 months old who are not circumcised are at greater risk for a UTI than circumcised boys the same age.1
The prevalence of cytochrome P450 oxidoreductase deficiency is unknown. About 65 cases have been reported worldwide. Researchers suspect that cytochrome P450 oxidoreductase deficiency is underdiagnosed and that mild cases of this disorder may be relatively common. Because the signs and symptoms can be difficult to detect, people with mild cytochrome P450 oxidoreductase deficiency may never come to medical attention.
Mutations in the ESCO2 gene cause Roberts syndrome. This gene provides instructions for making a protein that is important for proper chromosome separation during cell division. Before cells divide, they must copy all of their chromosomes. The copied DNA from each chromosome is arranged into two identical structures, called sister chromatids. The ESCO2 protein plays an important role in establishing the glue that holds the sister chromatids together until the chromosomes are ready to separate. All identified mutations in the ESCO2 gene prevent the cell from producing any functional ESCO2 protein, which causes some of the glue between sister chromatids to be missing around the chromosome's constriction point (centromere). In Roberts syndrome, cells respond to abnormal sister chromatid attachment by delaying cell division. Delayed cell division can be a signal that the cell should undergo self-destruction. The signs and symptoms of Roberts syndrome may result from the loss of cells from various tissues during early development. Because both mildly and severely affected individuals lack any functional ESCO2 protein, the underlying cause of the variation in disease severity remains unknown. Researchers suspect that other genetic and environmental factors may be involved.
Hypothalamic dysfunction refers to a condition in which the hypothalamus is not working properly. The hypothalamus produces hormones that control body temperature, hunger, moods, release of hormones from many glands such as the pituitary gland, sex drive, sleep, and thirst. The signs and symptoms patients have vary depending on the hormones missing. A number of different causes including anorexia, bleeding, genetic disorder, tumors, and more have been linked to hypothalamic dysfunction. Treatment depends on the cause of the hypothalamic dysfunction.
Insulin resistance is a condition in which the body produces insulin but does not use it effectively. When people have insulin resistance, glucose builds up in the blood instead of being absorbed by the cells, leading to type 2 diabetes or prediabetes. Most people with insulin resistance don't know they have it for many yearsuntil they develop type 2 diabetes, a serious, lifelong disease. The good news is that if people learn they have insulin resistance early on, they can often prevent or delay diabetes by making changes to their lifestyle. Insulin resistance can lead to a variety of serious health disorders. The section "What is metabolic syndrome?" provides more information about other health disorders linked to insulin resistance.
How is Bartter syndrome inherited? Bartter syndrome is inherited in an autosomal recessive manner, which means that both copies of the disease-causing gene (one inherited from each parent) have a mutation in an affected individual. Parents who each carry one mutated copy of the gene are referred to as carriers and typically do not have signs or symptoms of the condition. When two carriers for 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. Click here to visit the Genetic Home Reference Web site and view an illustration that demonstrates autosomal recessive inheritance.
These resources address the diagnosis or management of cyclic neutropenia: - Gene Review: Gene Review: ELANE-Related Neutropenia - Genetic Testing Registry: Cyclical neutropenia - Seattle Children's Hospital 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
The incidence of von Hippel-Lindau syndrome is estimated to be 1 in 36,000 individuals.
Fibrochondrogenesis is generally 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 usually do not show signs and symptoms of the condition. In a few reported cases, parents of children with fibrochondrogenesis have had mild features that may be related to the condition, including slightly short stature, myopia, cataracts, joint pain, and hearing loss. In at least one case of fibrochondrogenesis caused by a COL11A2 gene mutation, the condition was inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In this case, the condition resulted from a new (de novo) mutation in the gene that occurred during the formation of reproductive cells (eggs or sperm) in one of the affected individual's parents. There was no history of the disorder in the family.
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. In most cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
Beta-ketothiolase deficiency appears to be very rare. It is estimated to affect fewer than 1 in 1 million newborns.
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.
Klinefelter syndrome (KS) is a condition that occurs in males when they have an extra X chromosome. Some males with KS have no obvious signs or symptoms while others may have varying degrees of cognitive, social, behavioral, and learning difficulties. Adults with Klinefelter syndrome may also experience primary hypogonadism (decreased testosterone production), small testes, enlarged breast tissue (gynecomastia), tall stature, and/or infertility. KS is not inherited, but usually occurs as a random event during the formation of reproductive cells (eggs and sperm). Treatment is based on the signs and symptoms present in each person.
Isovaleric acidemia is estimated to affect at least 1 in 250,000 people in the United States.
What causes inflammatory myofibroblastic tumors? The underlying cause of inflammatory myofibroblastic tumors (IMTs) remains unknown. While some researchers believe it is a true neoplasm, others believe that it represents an immunologic response to an infectious or noninfectious agent. Several associations have been reported between IMT and infections, including: organizing pneumonia Mycobacterium avium intracellulare Corynebacterium equi (a bacteria that affects the lungs) Campylobacter jejuni (a common cause of gastroenteritis) Bacillus sphaericus Coxiella burnetii Epstein-Barr virus E. coli occlusive phlebitis of intrahepatic veins Associations have also been reported between IMT and: previous abdominal surgery trauma ventriculoperitoneal shunt radiation therapy steroid usage An inflammatory reaction to an underlying, low-grade malignancy has also been proposed as a cause. Because there is limited information available to support or refute any of these, the mechanism behind the development of IMTs is still unclear.
These resources address the diagnosis or management of Langerhans cell histiocytosis: - Cincinnati Children's Hospital Medical Center - Cleveland Clinic - Genetic Testing Registry: Langerhans cell histiocytosis, multifocal - National Cancer Institute: Langerhans Cell Histiocytosis Treatment - Seattle Children's Hospital - St. Jude Children's Research Hospital - Sydney Children's Hospital 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 infantile neuronal ceroid lipofuscinosis: - Genetic Testing Registry: Ceroid lipofuscinosis neuronal 1 - Genetic Testing Registry: Infantile neuronal ceroid lipofuscinosis 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 : A urinalysis is a test of your urine. It is often done to check for a urinary tract infections, kidney problems, or diabetes. You may also have one during a checkup, if you are admitted to the hospital, before you have surgery, or if you are pregnant. It can also monitor some medical conditions and treatments. A urinalysis involves checking the urine for - Its color - Its appearance (whether it is clear or cloudy) - Any odor - The pH level (acidity) - Whether there are substances that are not normally in urine, such as blood, too much protein, glucose, ketones, and bilirubin - Whether there are cells, crystals, and casts (tube-shaped proteins) - Whether it contains bacteria or other germs
Autosomal recessive optic atrophy, hearing loss, and peripheral neuropathy is a neurological condition described by Iwashita et al. in 1969 in a Korean brother and sister. This condition is characterized by variable degrees of hearing loss, distal weakness and loss of muscle tissue (atrophy) in the upper limbs, variable degrees of weakness and atrophy of the lower limbs, and optic atrophy with or without visual impairment. Autosomal recessive inheritance has been suggested.
The main symptom of short bowel syndrome is diarrhealoose, watery stools. Diarrhea can lead to dehydration, malnutrition, and weight loss. Dehydration means the body lacks enough fluid and electrolyteschemicals in salts, including sodium, potassium, and chlorideto work properly. Malnutrition is a condition that develops when the body does not get the right amount of vitamins, minerals, and nutrients it needs to maintain healthy tissues and organ function. Loose stools contain more fluid and electrolytes than solid stools. These problems can be severe and can be life threatening without proper treatment. Other signs and symptoms may include - bloating - cramping - fatigue, or feeling tired - foul-smelling stool - heartburn - too much gas - vomiting - weakness People with short bowel syndrome are also more likely to develop food allergies and sensitivities, such as lactose intolerance. Lactose intolerance is a condition in which people have digestive symptomssuch as bloating, diarrhea, and gasafter eating or drinking milk or milk products. More information is provided in the NIDDK health topic, Lactose Intolerance.
How is Coffin-Siris syndrome diagnosed? Diagnosis of Coffin-Siris syndrome is largely based upon the presence or absence of common signs and symptoms in the individual. While formal diagnostic criteria have not been established, most individuals with a clinical diagnosis of Coffin-Siris syndrome have certain features in common. You can find detailed information on this topic at the following link to GeneReviews. http://www.ncbi.nlm.nih.gov/books/NBK131811/#coffin-siris.Diagnosis Genetic testing may also be used to diagnose or confirm cases of Coffin-Siris syndrome.
SADDAN (severe achondroplasia with developmental delay and acanthosis nigricans) is a rare disorder of bone growth characterized by skeletal, brain, and skin abnormalities. All people with this condition have extremely short stature with particularly short arms and legs. Other features include unusual bowing of the leg bones; a small chest with short ribs and curved collar bones; short, broad fingers; and folds of extra skin on the arms and legs. Structural abnormalities of the brain cause seizures, profound developmental delay, and intellectual disability. Several affected individuals also have had episodes in which their breathing slows or stops for short periods (apnea). Acanthosis nigricans, a progressive skin disorder characterized by thick, dark, velvety skin, is another characteristic feature of SADDAN that develops in infancy or early childhood.
Joubert syndrome and related disorders can be caused by mutations in at least 10 genes. The proteins produced from these genes are known or suspected to play roles in cell structures called cilia. Cilia are microscopic, finger-like projections that stick out from the surface of cells and are involved in chemical signaling. Cilia are important for the structure and function of many types of cells, including brain cells (neurons) and certain cells in the kidneys and liver. Cilia are also necessary for the perception of sensory input (such as sight, hearing, and smell). Mutations in the genes associated with Joubert syndrome and related disorders lead to problems with the structure and function of cilia. Defects in these cell structures probably disrupt important chemical signaling pathways during development. Although researchers believe that defective cilia are responsible for most of the features of these disorders, it remains unclear how they lead to specific developmental abnormalities. Mutations in the 10 genes known to be associated with Joubert syndrome and related disorders only account for about half of all cases of these conditions. In the remaining cases, the genetic cause is unknown.
Most cases of lung cancer are not related to inherited gene changes. These cancers are associated with somatic mutations that occur only in certain cells in the lung. When lung cancer is related to inherited gene changes, the cancer risk is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to increase a person's chance of developing cancer. It is important to note that people inherit an increased risk of cancer, not the disease itself. Not all people who inherit mutations in these genes will develop lung cancer.
Charcot-Marie-Tooth disease type 1A (CMT1A) is a type of inherited neurological disorder that affects the peripheral nerves. Affected individuals experience weakness and wasting (atrophy) of the muscles of the lower legs beginning in adolescence; later they experience hand weakness and sensory loss. CMT1A is caused by having an extra copy (a duplication) of the PMP22 gene. It is inherited in an autosomal dominant manner. Treatment for this condition may include physical therapy; occupational therapy; braces and other orthopedic devices; orthopedic surgery; and pain medications.
More detailed information on heart failure is available at http://www.nhlbi.nih.gov/health/dci
These resources address the diagnosis or management of retroperitoneal fibrosis: - Johns Hopkins Medicine 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
What causes laryngeal cleft? During fetal development, the trachea and esophagus begin as one tube. They later separate when a wall of tissue known as the tracheoesophageal septum forms, dividing the original tube into the trachea and esophagus. If the tracheoesophageal septum fails to form, the trachea and esophagus may remain open to each other or abnormally shaped, causing abnormalities such as a laryngeal cleft, tracheoesophageal fistula, or esophageal atresia. Exactly why these abnormalities occur is unknown.
ADCY5-related dyskinesia is a movement disorder that is characterized by several different types of involuntary movements. Affected people generally develop sudden jerks, twitches, tremors, muscle tensing, and/or writhing movements between infancy and late adolescence. The arms, legs, neck and face are most commonly involved. Hypotonia and delayed motor milestones (i.e. crawling, walking) may also be present in more severely affected infants. As the name suggests, ADCY5-related dyskinesia is caused by changes (mutations) in the ADCY5 gene. It is inherited in an autosomal dominant manner. Treatment is based on the signs and symptoms present in each person and may include medications, physical therapy, and occupational therapy.
Mutations in the CATSPER1 gene cause CATSPER1-related nonsyndromic male infertility. The CATSPER1 gene provides instructions for producing a protein that is found in the tail of sperm cells. The CATSPER1 protein is involved in the movement of the sperm tail, which propels the sperm forward and is required for sperm cells to push through the outside membrane of the egg cell during fertilization. CATSPER1 gene mutations result in the production of a CATSPER1 protein that may be altered, nonfunctional, or quickly broken down (degraded) by the cell. Sperm cells missing a functional CATSPER1 protein have decreased motion in their tails and move more slowly than normal. Sperm cells lacking functional CATSPER1 protein cannot push through the outside membrane of the egg cell. As a result, sperm cells cannot reach the inside of the egg cell to achieve fertilization.
DRPLA is caused by a mutation in the ATN1 gene. This gene provides instructions for making a protein called atrophin 1. Although the function of atrophin 1 is unclear, it likely plays an important role in nerve cells (neurons) in many areas of the brain. The ATN1 mutation that underlies DRPLA involves a DNA segment known as a CAG trinucleotide repeat. This segment is made up of a series of three DNA building blocks (cytosine, adenine, and guanine) that appear multiple times in a row. Normally, this segment is repeated 6 to 35 times within the ATN1 gene. In people with DRPLA, the CAG segment is repeated at least 48 times, and the repeat region may be two or three times its usual length. The abnormally long CAG trinucleotide repeat changes the structure of atrophin 1. This altered protein accumulates in neurons and interferes with normal cell functions. The dysfunction and eventual death of these neurons lead to uncontrolled movements, intellectual decline, and the other characteristic features of DRPLA.
These resources address the diagnosis or management of MCHS: - Gene Review: Gene Review: POLG-Related Disorders - United Mitochondrial Disease Foundation: Diagnosis of Mitochondrial Disease 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
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. Most cases of Floating-Harbor syndrome result from new mutations in the gene and occur in people with no history of the disorder in their family. However, in some cases an affected person inherits the mutation from one affected parent.
Isolated congenital diaphragmatic hernia is rarely inherited. In almost all cases, there is only one affected individual in a family. When congenital diaphragmatic hernia occurs as a feature of a genetic syndrome or chromosomal abnormality, it may cluster in families according to the inheritance pattern for that condition.
These resources address the diagnosis or management of frontometaphyseal dysplasia: - Gene Review: Gene Review: Otopalatodigital Spectrum Disorders - Genetic Testing Registry: Frontometaphyseal dysplasia 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
What are the signs and symptoms of Pulmonic stenosis? The Human Phenotype Ontology provides the following list of signs and symptoms for Pulmonic stenosis. 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) Abnormality of the pulmonary artery 90% Atria septal defect 50% Pulmonic stenosis - 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.
Protein C deficiency is a disorder that increases a person's risk to develop abnormal blood clots. The condition can be mild or severe. People with mild protein C deficiency are at risk for a type of clot called deep vein thrombosis (DVT). A DVT can travel through the bloodstream and become stuck in the lung, which can cause a life-threatening pulmonary embolism. Most people with mild protein C deficiency never develop abnormal blood clots, but certain factors can increase the risk to develop a blood clot. In severe protein C deficiency, affected infants develop a life-threatening blood clotting disorder called purpura fulminans soon after birth. This is characterized by blood clots that block normal blood flow and can lead to death of body tissues (necrosis). Abnormal bleeding can occur in various parts of the body causing purple patches on the skin. Protein C deficiency may be inherited or acquired. The inherited form is caused by mutations in the PROC gene and is inherited in an autosomal dominant manner. Most people with protein C deficiency do not have any symptoms and require no specific treatment. However, in situations of clot risk such as pregnancy, surgery or trauma, prevention treatment may be indicated. Patients with the severe form of the disease are treated depending on the symptoms. A protein C concentrate is effective in many cases. Liver transplant may cure the babies with this disease.
Buerger disease is a disease of the arteries and veins in the arms and legs. The arteries and veins become inflamed which can lead to narrowed and blocked vessels. This reduces blood flow resulting in pain and eventually damage to affected tissues. Buerger disease nearly always occurs in association with cigarette or other tobacco use. Quitting all forms of tobacco is an essential part of treatment.
How is Coats disease inherited? In most cases, Coats disease is not inherited. 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 people with Senior-Loken syndrome and is a key symptom of a condition called Coats plus syndrome, which is characterized by Coats disease plus abnormalities of the brain, bones, gastrointestinal system, and other parts of the body. Both of these conditions are inherited in an autosomal recessive manner.
All forms of adenylosuccinate lyase deficiency are caused by mutations in the ADSL gene. This gene provides instructions for making an enzyme called adenylosuccinate lyase, which performs two steps in the process that produces purine nucleotides. These nucleotides are building blocks of DNA, its chemical cousin RNA, and molecules such as ATP that serve as energy sources in the cell. Adenylosuccinate lyase converts a molecule called succinylaminoimidazole carboxamide ribotide (SAICAR) to aminoimidazole carboxamide ribotide (AICAR) and converts succinyladenosine monophosphate (SAMP) to adenosine monophosphate (AMP). Most of the mutations involved in adenylosuccinate lyase deficiency change single protein building blocks (amino acids) in the adenylosuccinate lyase enzyme, which impairs its function. Reduced function of this enzyme leads to buildup of SAICAR and SAMP, which are converted through a different reaction to succinylaminoimidazole carboxamide riboside (SAICAr) and succinyladenosine (S-Ado). Researchers believe that SAICAr and S-Ado are toxic; damage to brain tissue caused by one or both of these substances likely underlies the neurological problems that occur in adenylosuccinate lyase deficiency. Studies suggest that the amount of SAICAr relative to S-Ado reflects the severity of adenylosuccinate lyase deficiency. Individuals with more SAICAr than S-Ado have more severe encephalopathy and psychomotor delay.
Much of the research on RS focuses on answering fundamental questions about the disorder such as how problems in the body's metabolism may trigger the nervous system damage characteristic of RS and what role aspirin plays in this life-threatening disorder. The ultimate goal of this research is to improve scientific understanding, diagnosis and medical treatment of RS.
2-hydroxyglutaric aciduria is a rare disorder. D-2-HGA and L-2-HGA have each been reported to affect fewer than 150 individuals worldwide. Combined D,L-2-HGA appears to be even rarer, with only about a dozen reported cases.
The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct research related to HAM/TSP in laboratories at the NIH, and support additional research through grants to major medical institutions across the country. Much of this research focuses on finding better ways to prevent, treat, and ultimately cure disorders such as HAM/TSP.
Congenital deafness with vitiligo and achalasia is a syndrome characterized by deafness present from birth (congenital), associated with short stature, vitiligo, muscle wasting and achalasia (swallowing difficulties). The condition was described in a brother and sister born to first cousin parents. It is believed to be inherited in an autosomal recessive manner.
Kienbock's disease is a condition characterized by interruption of blood supply to one of the small bones of the hand near the wrist (the lunate). If blood supply to a bone stops, the bone can die; this is known as osteonecrosis. Affected people may first think they have a sprained wrist and may have experienced trauma to the wrist, which can disrupt the blood flow to the lunate. As the disease progresses, signs and symptoms may include a painful and/or swollen wrist; stiffness; decreased grip strength; tenderness directly over the bone; and pain or difficulty in turning the hand upward. The underlying cause of Kienbock's disease is unknown. Treatment aims to relieve the pressure on the bone and restore blood flow within the bone. Surgery may be recommended.
Is Denys-Drash syndrome inherited? Denys-Drash syndrome is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. Most cases of Denys-Drash syndrome result from new (de novo) mutations in the gene that occur during the formation of reproductive cells (eggs or sperm) or in early embryonic development. These cases occur in people with no history of the disorder in their family.
These resources address the diagnosis or management of Jackson-Weiss syndrome: - Gene Review: Gene Review: FGFR-Related Craniosynostosis Syndromes - Genetic Testing Registry: Jackson-Weiss syndrome - MedlinePlus Encyclopedia: Craniosynostosis 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
Cyclic neutropenia is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
What are the signs and symptoms of Spermatogenesis arrest? The Human Phenotype Ontology provides the following list of signs and symptoms for Spermatogenesis arrest. 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) Abnormality of metabolism/homeostasis - Autosomal dominant inheritance - Autosomal recessive inheritance - Azoospermia - Recurrent spontaneous abortion - 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.
Platelet storage pool deficiency refers to a group of conditions that are caused by problems with the platelet granules. Platelet granules are tiny storage sacs found within the platelets which release various substances to help stop bleeding. Platelet storage pool deficiencies occur when platelet granules are absent, reduced in number, or unable to empty their contents into the bloodstream. The signs and symptoms include frequent nosebleeds; abnormally heavy or prolonged menstruation; easy bruising; recurrent anemia; and abnormal bleeding after surgery, dental work or childbirth. Platelet storage pool deficiencies may be genetic or acquired (non-genetic). They can also be part of an inherited genetic syndrome such as Hermansky-Pudlak syndrome, Chediak-Higashi syndrome, thrombocytopenia-absent radius (TAR) syndrome, and Wiskott-Aldrich syndrome. Treatment is symptomatic.
This condition is inherited in an X-linked recessive pattern. The gene associated with this condition is located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), a mutation would have to occur in both copies of the gene to cause the disorder. Because it is unlikely that females will have two altered copies of this gene, males are affected by X-linked recessive disorders much more frequently than females. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons. In X-linked recessive inheritance, a female with one altered copy of the gene in each cell is called a carrier. Carriers of an ABCB7 mutation can pass on the mutated gene but do not develop ataxia or other health problems associated with X-linked sideroblastic anemia and ataxia. However, carriers may have abnormally small, pale red blood cells and related changes that can be detected with a blood test.
Familial paroxysmal kinesigenic dyskinesia can be caused by mutations in the PRRT2 gene. The function of the protein produced from this gene is unknown, although it is thought to be involved in the development and function of the brain. Studies suggest that the PRRT2 protein interacts with a protein that helps control signaling between nerve cells (neurons). It is thought that PRRT2 gene mutations, which reduce the amount of PRRT2 protein, lead to abnormal neuronal signaling. Altered neuronal activity could underlie the movement problems associated with familial paroxysmal kinesigenic dyskinesia. Not everyone with this condition has a mutation in the PRRT2 gene. When no PRRT2 gene mutations are found, the cause of the condition is unknown.
In many cases, the cause of pericarditis (both acute and chronic) is unknown. Viral infections are likely a common cause of pericarditis, although the virus may never be found. Pericarditis often occurs after a respiratory infection. Bacterial, fungal, and other infections also can cause pericarditis. Most cases of chronic, or recurring, pericarditis are thought to be the result of autoimmune disorders. Examples of such disorders include lupus, scleroderma, and rheumatoid arthritis. With autoimmune disorders, the body's immune system makes antibodies (proteins) that mistakenly attack the body's tissues or cells. Other possible causes of pericarditis are: Heart attack and heart surgery Kidney failure, HIV/AIDS, cancer, tuberculosis, and other health problems Injuries from accidents or radiation therapy Certain medicines, like phenytoin (an antiseizure medicine), warfarin and heparin (blood-thinning medicines), and procainamide (a medicine to treat irregular heartbeats)
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.
Pulmonary arterial hypertension is a progressive disorder characterized by abnormally high blood pressure (hypertension) in the pulmonary artery, the blood vessel that carries blood from the heart to the lungs. Pulmonary arterial hypertension is one form of a broader condition known as pulmonary hypertension. Pulmonary hypertension occurs when most of the very small arteries throughout the lungs narrow in diameter, which increases the resistance to blood flow through the lungs. To overcome the increased resistance, blood pressure increases in the pulmonary artery and in the right ventricle of the heart, which is the chamber that pumps blood into the pulmonary artery. Ultimately, the increased blood pressure can damage the right ventricle of the heart. Signs and symptoms of pulmonary arterial hypertension occur when increased blood pressure cannot fully overcome the elevated resistance. As a result, the flow of oxygenated blood from the lungs to the rest of the body is insufficient. Shortness of breath (dyspnea) during exertion and fainting spells are the most common symptoms of pulmonary arterial hypertension. People with this disorder may experience additional symptoms, particularly as the condition worsens. Other symptoms include dizziness, swelling (edema) of the ankles or legs, chest pain, and a rapid heart rate.