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Familial cylindromatosis is a rare disorder; its prevalence is unknown.
Older age can affect the risk of developing chronic lymphocytic leukemia. Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesnt mean that you will not get cancer. Talk with your doctor if you think you may be at risk. Risk factors for CLL include the following: - Being middle-aged or older, male, or white. - A family history of CLL or cancer of the lymph system. - Having relatives who are Russian Jews or Eastern European Jews.
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.
Wandering spleen is a rare condition that occurs when the spleen lacks one or more of the ligments that hold the spleen in its normal position in the upper left abdomen. If a person is born with this condition it is referred to as congenital wandering spleen. The condition is not hereditary. Acquired wandering spleen may occur during adulthood due to injuries or other underlying conditions that may weaken the ligaments that hold the spleen. Symptoms of wandering spleen may include englargement of the spleen (splenomegaly), abdominal pain, intestinal obstruction, nausea, vomiting, fever, and a lump in the abdomen or the pelvis. Some individuals with this condition do not have symptoms. Treatment for this condition involes removal of the spleen (splenectomy).
The prognosis for individuals with LNS is poor. Death is usually due to renal failure in the first or second decade of life.
What is the goal for treating 21-hydroxylase-deficient congenital adrenal hyperplasia? The objectives for treating 21-hydroxylase deficiency differ with age. In childhood, the overall goal is to replace cortisol. Obtaining hormonal balance is important and patients growth velocity and bone age is monitored. Routine analysis of blood, urine, and/or saliva may also be necessary. Corrective surgery is frequently required for females born with abnormal genitalia. In late childhood and adolescence, maintaining hormonal balance is equally important. Overtreatment may result in obesity and delayed menarche/puberty, whereas under-replacement will result in sexual precocity. Also, it is important that teens and young adults with 21-hydroxylase deficiency be successfully transitioned to adult care facilities. Follow-up of adult patients should involve multidisciplinary clinics. Problems in adult women include fertility concerns, excessive hair growth, and menstrual irregularity; obesity and impact of short stature; sexual dysfunction and psychological problems. Counseling may be helpful. Adult males may develop enlargement of the testes and if so, should work with an endocrinologist familiar with the management of patients with this deficiency.
These resources address the diagnosis or management of Timothy syndrome: - Gene Review: Gene Review: Timothy Syndrome - Genetic Testing Registry: Timothy syndrome - MedlinePlus Encyclopedia: Arrhythmias - MedlinePlus Encyclopedia: Congenital Heart Disease - MedlinePlus Encyclopedia: Webbing of the Fingers or Toes 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
Aplastic anemia is a rare but serious blood disorder. If you have it, your bone marrow doesn't make enough new blood cells. Causes include - Toxic substances, such as pesticides, arsenic, and benzene - Radiation therapy and chemotherapy for cancer - Certain medicines - Infections such as hepatitis, Epstein-Barr virus, or HIV - Autoimmune disorders - Certain inherited conditions - Pregnancy In many people, the cause is unknown. Symptoms include fatigue, weakness, dizziness, and shortness of breath. It can cause heart problems such as an irregular heartbeat, an enlarged heart, and heart failure. You may also have frequent infections and bleeding. Your doctor will diagnose aplastic anemia based on your medical and family histories, a physical exam, and test results. Once your doctor knows the cause and severity of the condition, he or she can create a treatment plan for you. Treatments include blood transfusions, blood and marrow stem cell transplants, and medicines. NIH: National Heart, Lung, and Blood Institute
The NINDS supports research on genetic disorders, including the leukodystrophies. The goals of this research are to increase scientific understanding of these disorders, and to find ways to prevent, treat, and, ultimately, cure them.
The standard way to be sure a person is infected with Fasciola is by seeing the parasite. This is usually done by finding Fasciola eggs in stool (fecal) specimens examined under a microscope. More than one specimen may need to be examined to find the parasite. Sometimes eggs are found by examining duodenal contents or bile. Infected people don't start passing eggs until they have been infected for several months; people don't pass eggs during the acute phase of the infection. Therefore, early on, the infection has to be diagnosed in other ways than by examining stool. Even during the chronic phase of infection, it can be difficult to find eggs in stool specimens from people who have light infections. Certain types of blood tests can be helpful for diagnosing Fasciola infection, including routine blood work and tests that detect antibodies (an immune response) to the parasite. More on: Resources for Health Professionals: Diagnosis
Glioma refers to a type of brain tumor that develops from the glial cells, which are specialized cells that surround and support neurons (nerve cells) in the brain. It is generally classified based on which type of glial cell is involved in the tumor: Astocytoma - tumors that develop from star-shaped glial cells called astrocytes Ependymomas - tumors that arise from ependymal cells that line the ventricles of the brain and the center of the spinal cord Oligodendrogliomas - tumors that affect the oligodendrocytes The symptoms of glioma vary by type but may include headaches; nausea and vomiting; confusion; personality changes; trouble with balance; vision problems; speech difficulties; and/or seizures. The exact underlying cause is unknown. In most cases, the tumor occurs sporadically in people with no family history of the condition. Treatment depends on many factors, including the type, size, stage and location of the tumor, but may include surgery, radiation therapy, chemotherapy and/or targeted therapy.
What causes disseminated peritoneal leiomyomatosis (DPL)? The cause of disseminated peritoneal leiomyomatosis (DPL) is unknown, but medical researchers believe it is influenced by both hormonal and genetic factors. Not all cases are related to hormone levels, as some cases have occurred in men and in post-menopausal women not receiving hormone replacement therapy. DPL is often associated with uterine leiomyomas but the connection is unclear. Most cases occur sporadically in people with no family history of the condition; however, more than one family member can be affected. Although this suggests that genetic factors may play a role in the development of DPL in some families, researchers have not identified any specific gene changes known to cause the condition.The cause of the condition is considered multifactorial .
Tay-Sachs disease is a rare inherited disorder that causes progressive destruction of nerve cells in the brain and spinal cord. Tay-Sachs is caused by the absence of a vital enzyme called hexosaminidase-A (Hex-A). Without Hex-A, a fatty substance, or lipid, called GM2 ganglioside accumulates abnormally in cells, especially in the nerve cells of the brain. This ongoing accumulation causes progressive damage to the cells. Tay-Sachs disease is inherited in an autosomal recessive pattern.
What causes colpocephaly? Researchers believe that the disorder results from some kind of disturbance in the fetal environment that occurs between the second and sixth months of pregnancy. The underlying causes of colpocephaly are multiple and diverse. Causes include chromosomal anomalies such as trisomy-8 mosaicism and trisomy-9 mosaicism; intrauterine infection such as toxoplasmosis; perinatal anoxic-ischemic encephalopathy; and maternal drug ingestion during early pregnancy, such as corticosteroids, salbutamol, and theophylline. In addition, a familial occurrence of colpocephaly has been noted in three reports. A genetic origin with an autosomal recessive or X-linked recessive inheritance was suggested in these familial cases.
MIDD is inherited in a mitochondrial pattern, which is also known as maternal inheritance. This pattern of inheritance applies to genes contained in mtDNA. Because egg cells, but not sperm cells, contribute mitochondria to the developing embryo, children can only inherit disorders resulting from mtDNA mutations from their mother. These disorders can appear in every generation of a family and can affect both males and females, but fathers do not pass traits associated with changes in mtDNA to their children. Most of the body's cells contain thousands of mitochondria, each with one or more copies of mtDNA. These cells can have a mix of mitochondria containing mutated and unmutated DNA (heteroplasmy). The severity of MIDD is thought to be associated with the percentage of mitochondria with the mtDNA mutation.
Mucopolysaccharidosis type IVA (MPS IVA, also called Morquio syndrome, type A) is a metabolic condition that primarily affects the skeleton. The severity, age of onset, and associated symptoms vary significantly from person to person and range from a severe and rapidly progressive, early-onset form to a slowly progressive, later-onset form. The severe form is usually diagnosed between ages 1 and 3, while the milder form may not become evident until late childhood or adolescence. Signs and symptoms include various skeletal abnormalities such as short stature, knock knees, pectus carinatum, and malformations of the spine, hips and wrists. Affected people may also experience involvement of other organ systems such as respiratory problems, valvular heart disease, hearing impairment, corneal clouding, dental abnormalities, hepatomegaly, and spinal cord compression. MPS IVA is caused by changes (mutations) in the GALNS gene and is inherited in an autosomal recessive manner. Treatment is based on the signs and symptoms present in each person.
Lentigo maligna melanoma (LMM) is a type of skin cancer that usually develops in older, fair-skinned adults. The average age of diagnosis is 65. LMM is thought to be caused by a history of sun exposure to the affected area. Treatment includes surgery to remove as much of the LMM as possible.
Mutations in the SCN4A gene cause potassium-aggravated myotonia. The SCN4A gene provides instructions for making a protein that is critical for the normal function of skeletal muscle cells. For the body to move normally, skeletal muscles must tense (contract) and relax in a coordinated way. Muscle contractions are triggered by the flow of positively charged atoms (ions), including sodium, into skeletal muscle cells. The SCN4A protein forms channels that control the flow of sodium ions into these cells. Mutations in the SCN4A gene alter the usual structure and function of sodium channels. The altered channels cannot properly regulate ion flow, increasing the movement of sodium ions into skeletal muscle cells. The influx of extra sodium ions triggers prolonged muscle contractions, which are the hallmark of myotonia.
Blastomycosis is a rare infection that may develop when people inhale a fungus called Blastomyces dermatitidis, a fungus that is found in moist soil, particularly where there is rotting vegetation. The fungus enters the body through the lungs, infecting them. The fungus then spreads to other areas of the body. The infection may affect the skin, bones and joints, and other areas. The disease usually affects people with weakened immune systems, such as those with HIV or who have had an organ transplant.
Majeed syndrome appears to be very rare; it has been reported in three families, all from the Middle East.
What causes of accessory navicular bone? The cause of accessory navicular bone is unknown. In some cases, the condition may be related to the development of flatfoot also known as pes planus, in other cases it may be related to repeated foot and ankle sprains.
The signs and symptoms of childhood ependymoma are not the same in every child. Signs and symptoms depend on the following: - The child's age. - Where the tumor has formed. Signs and symptoms may be caused by childhood ependymoma or by other conditions. Check with your child's doctor if your child has any of the following: - Frequent headaches. - Seizures. - Nausea and vomiting. - Pain or stiffness in the neck. - Loss of balance or trouble walking. - Weakness in the legs. - Blurry vision. - Back pain. - A change in bowel function. - Trouble urinating. - Confusion or irritability.
Psuedohypoaldosteronism type 2 is an inborn error of metabolism. It is characterized by high blood pressure, high levels of potassium in the body, and metabolic acidosis. It is caused by mutations in the WNK1 or WNK4 gene. Treatment may involve dietary restriction of sodium and hydrochlorothiazide.
Sporadic LAM is estimated to occur in 2 to 5 per million women worldwide. This condition may be underdiagnosed because its symptoms are similar to those of other lung disorders such as asthma, bronchitis, and chronic obstructive pulmonary disease.
These resources address the diagnosis or management of ZAP70-related severe combined immunodeficiency: - Baby's First Test: Severe Combined Immunodeficiency - Gene Review: Gene Review: ZAP70-Related Severe Combined Immunodeficiency - Genetic Testing Registry: Severe combined immunodeficiency, atypical 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
Myotonia congenita is estimated to affect 1 in 100,000 people worldwide. This condition is more common in northern Scandinavia, where it occurs in approximately 1 in 10,000 people.
Growth failure is a complication of CKD in which children do not grow as expected. When a child is below the third percentilemeaning 97 percent of children the same age and gender are tallerhe or she has growth failure.1 CKD is kidney disease that does not go away with treatment and tends to get worse over time. Health care providers use charts to monitor the growth of children with CKD and look for signs of growth failure. Growth charts for children use percentiles to compare a particular childs height with the height of children the same age and gender. For example, a child whose height is at the 50th percentile on a growth chart means half the children in the United States are taller than that child and half the children are shorter. About one-third of children with CKD have growth failure.1 Children diagnosed with CKD at a younger age - have a higher chance of developing growth failure - have more health issues related to growth failure and CKD
Anyone can get hepatitis A, but those more likely to are people who - travel to developing countries - live with someone who currently has an active hepatitis A infection - use illegal drugs, including noninjection drugs - have unprotected sex with an infected person - provide child care Also, men who have sex with men are more likely to get hepatitis A.
Actin-accumulation myopathy is a disorder that primarily affects skeletal muscles, which are muscles that the body uses for movement. People with actin-accumulation myopathy have severe muscle weakness (myopathy) and poor muscle tone (hypotonia) throughout the body. Signs and symptoms of this condition are apparent in infancy and include feeding and swallowing difficulties, a weak cry, and difficulty with controlling head movements. Affected babies are sometimes described as "floppy" and may be unable to move on their own. The severe muscle weakness that occurs in actin-accumulation myopathy also affects the muscles used for breathing. Individuals with this disorder may take shallow breaths (hypoventilate), especially during sleep, resulting in a shortage of oxygen and a buildup of carbon dioxide in the blood. Frequent respiratory infections and life-threatening breathing difficulties can occur. Because of the respiratory problems, most affected individuals do not survive past infancy. Those who do survive have delayed development of motor skills such as sitting, crawling, standing, and walking. The name actin-accumulation myopathy derives from characteristic accumulations in muscle cells of filaments composed of a protein called actin. These filaments can be seen when muscle tissue is viewed under a microscope.
Polyembryoma is a type of tumor that develops from the cells of the gonads (testes in men or ovaries in women). Such tumors are called germ cell tumors. Polyembryomas have a distinctive look because they are composed of many parts that are shaped like embryos, one of the earliest stages of a developing human during pregnancy. Symptoms of a polyembryoma may include an unusual bump or mass in the abdomen which can cause pain in some individuals; puberty at an unusually young age (known as precocious puberty); or irregularities in a female's menstruation. Treatment begins with surgery and may be followed by chemotherapy and/or radiation therapy. The cause of polyembryoma is not yet known.
These resources address the diagnosis or management of familial exudative vitreoretinopathy: - Gene Review: Gene Review: Familial Exudative Vitreoretinopathy, Autosomal Dominant - Gene Review: Gene Review: NDP-Related Retinopathies - Genetic Testing Registry: Exudative vitreoretinopathy 1 - Genetic Testing Registry: Exudative vitreoretinopathy 3 - Genetic Testing Registry: Exudative vitreoretinopathy 4 - Genetic Testing Registry: Familial exudative vitreoretinopathy, X-linked 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
Hutchinson-Gilford progeria syndrome is considered an autosomal dominant condition, which means one copy of the altered gene in each cell is sufficient to cause the disorder. The condition results from new mutations in the LMNA gene, and almost always occurs in people with no history of the disorder in their family.
How is intrahepatic cholestasis of pregnancy diagnosed? Intrahepatic cholestasis of pregnancy (ICP) is suspected during pregnancy when symptoms of itching (pruritis) present after 25 weeks of gestation with absence of a rash or underlying maternal liver disease. The diagnosis is typically confirmed with the finding of elevated serum bile acids. Is genetic testing available for intrahepatic cholestasis of pregnancy? In the presence of a family history of intrahepatic cholestasis of pregnancy (ICP) and/or known mutations in either the ABCB11 or ABCB4 genes, genetic testing is available. The Genetic Testing Registry (GTR), a resource from the National Center for Biotechnology, offers a listing of laboratories that perform genetic testing for intrahepatic cholestasis of pregnancy. For more information, click on the link.
Lucey-Driscoll syndrome, a form of transient familial hyperbilirubinemia, is a rare metabolic disorder that leads to very high levels of bilirubin in a newborn's blood. Babies with this disorder may be born with severe jaundice (yellow skin), yellow eyes and lethargy. It occurs when the body does not properly break down (metabolize) a certain form of bilirubin. If untreated, this condition can cause seizures, neurologic problems (kernicterus) and even death. Treatment for Lucey-Driscoll syndrome includes phototherapy with blue light (to treat the high level of bilirubin in the blood) and an exchange transfusion is sometimes necessary. Different inheritance patterns have been reported and in some cases, it occurs in individuals with no family history of the condition.
Myoclonic epilepsy with ragged-red fibers (MERRF) is a disorder that affects many parts of the body, particularly the muscles and nervous system. In most cases, the signs and symptoms of this disorder appear during childhood or adolescence. The features of MERRF vary widely among affected individuals, even among members of the same family. MERRF is characterized by muscle twitches (myoclonus), weakness (myopathy), and progressive stiffness (spasticity). When the muscle cells of affected individuals are stained and viewed under a microscope, these cells usually appear abnormal. These abnormal muscle cells are called ragged-red fibers. Other features of MERRF include recurrent seizures (epilepsy), difficulty coordinating movements (ataxia), a loss of sensation in the extremities (peripheral neuropathy), and slow deterioration of intellectual function (dementia). People with this condition may also develop hearing loss or optic atrophy, which is the degeneration (atrophy) of nerve cells that carry visual information from the eyes to the brain. Affected individuals sometimes have short stature and a form of heart disease known as cardiomyopathy. Less commonly, people with MERRF develop fatty tumors, called lipomas, just under the surface of the skin.
Desmosterolosis is a condition that is characterized by neurological problems, such as brain abnormalities and developmental delay, and can also include other signs and symptoms. Children with desmosterolosis have delayed speech and motor skills (such as sitting and walking). Later in childhood, some affected individuals are able to walk with support; verbal communication is often limited to a few words or phrases. Common brain abnormalities in desmosterolosis include malformation of the tissue that connects the left and right halves of the brain (the corpus callosum) and loss of white matter, which consists of nerve fibers covered by a fatty substance called myelin. People with desmosterolosis commonly have muscle stiffness (spasticity) and stiff, rigid joints (arthrogryposis) affecting their hands and feet. Other features seen in some affected individuals include short stature, abnormal head size (either larger or smaller than normal), a small lower jaw (micrognathia), an opening in the roof of the mouth (cleft palate), involuntary eye movements (nystagmus) or eyes that do not look in the same direction (strabismus), heart defects, and seizures.
What are the signs and symptoms of Chilaiditi syndrome? The symptoms of Chilaiditi syndrome vary. Chronic recurrent abdominal pain is a common finding. Other symptoms might include nausea, vomiting, constipation, indigestion, difficulty swallowing, and abdominal tenderness, especially in the upper, central area. In some cases, breathing problems may develop.
How might Chiari malformation type 1 be treated? Some individuals with Chiari malformation type 1 are asymptomatic and do not require treatment. Individuals who have minimal symptoms, without syringomyelia, can typically be treated conservatively. Mild neck pain and headaches can usually be treated with pain medications, muscle relaxants, and the occasional use of a soft collar. Individuals with more severe symptoms may be in need of surgery. Surgery is the only treatment available to correct functional disturbances or halt the progression of damage to the central nervous system. The goals of surgical treatment are decompression of the point where the skull meets the spine (the cervicomedullary junction) and restoration of normal flow of cerebrospinal fluid in the region of the foramen magnum (the hole in the bottom of the skull where the spinal cord passes to connect to the brain). Prognosis after surgery for the condition is generally good and typically depends on the extent of neurological deficits that were present before the surgery. Most individuals have a reduction of symptoms and/or prolonged periods of relative stability. More than one surgery may be needed to treat the condition.
What causes aplasia cutis congenita? There is no one cause for all cases of aplasia cutis congenita. The condition is thought to be multifactorial, which means that several factors likely interact to cause the condition. Factors that may contribute include genetic factors; teratogens (exposures during pregnancy that can harm a developing fetus) such as methimazole, carbimazole, misoprostol, and valproic acid; compromised vasculature to the skin; and trauma. Some cases may represent an incomplete or unusual form of a neural tube defect. Familial cases of aplasia cutis congenita have been reported. Cases that appear to be genetic may be inherited in an autosomal dominant or autosomal recessive manner.
The incidence of hereditary fructose intolerance is estimated to be 1 in 20,000 to 30,000 individuals each year worldwide.
What are the signs and symptoms of HTLV-1 associated myelopathy/tropical spastic paraparesis? Signs and symptoms of HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP) vary but may include: Progressive weakness Stiff muscles Muscle spasms Backache A 'weak' bladder Constipation Rarely HAM/TSP may cause: Uveitis Arthritis Inflammation of the lung Polymyositis Dry eyes (keratoconjunctivitis sicca) Skin inflammation (infectious dermatitis)
Most cases of GIST are not inherited. Sporadic GIST is associated with somatic mutations, which are genetic changes that occur only in the tumor cells and occur during a person's lifetime. In some cases of familial GIST, including those associated with mutations in the KIT and PDGFRA genes, mutations are 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 tumors. When familial GIST is associated with mutations in other genes, it can have an autosomal recessive pattern of inheritance, which means alterations in both copies of the gene in each cell increase a person's chance of developing tumors.
- Proctitis is inflammation of the lining of the rectum, the lower end of the large intestine leading to the anus. - Common causes of proctitis are sexually transmitted diseases (STDs), non-STD infections, anorectal trauma, ulcerative colitis and Crohns disease, radiation therapy, and antibiotic use. - Treatment of proctitis depends on its cause; the goal of treatment is to reduce inflammation, control symptoms, and eliminate infection, if present. - With proper medical attention, proctitis can be successfully treated. - If infection is present with proctitis, antibiotics can be used to kill bacteria and antiviral medications can treat viral infections. - People who receive anal sex can avoid getting STD-related proctitis by having their partner use a condom. - If anorectal trauma caused proctitis, stopping the activity that triggered inflammation often will stop the inflammation and prevent recurrence. - Some causes of proctitis cannot always be prevented, but their symptoms can be treated by a doctor.
Acquired hemophilia is a bleeding disorder that interferes with the body's blood clotting process. Although the condition can affect people of all ages, it generally occurs in older people (the median age of diagnosis is between 60 and 67 years). Signs and symptoms include prolonged bleeding, frequent nosebleeds, bruising throughout the body, solid swellings of congealed blood (hematomas), hematuria, and gastrointestinal or urologic bleeding. Acquired hemophilia occurs when the body's immune system attacks and disables a certain protein that helps the blood clot. About half of the cases are associated with other conditions, such as pregnancy, autoimmune disease, cancer, skin diseases, or allergic reactions to medications. Treatment is aimed at controlling bleeding episodes and addressing the underlying cause of the condition.
How might dentatorubral-pallidoluysian atrophy (DRPLA) be treated? There is no cure for DRPLA; treatment is generally symptomatic and supportive. Management of signs and symptoms may include: Treatment of seizures with anti-epileptic drugs Treatment of psychiatric problems with appropriate psychotropic medications Adaptation of environment and care to the level of dementia Adaptation of educational programs for affected children.
Schindler disease is very rare. Only a few individuals with each type of the disorder have been identified.
Ollier disease is a skeletal disorder characterized by an asymmetric distribution of cartilagenous tumors (endochondromas) which may lead to skeletal deformities and limb-length discrepancy.[3] This condition primarily affects the long bones and cartilage of the joints of the arms and legs, specifically the area where the shaft and head of a long bone meet (metaphyses). Clinical manifestations often appear in the first decade of life. The cause is unknown. There is no medical treatment, although surgery may be indicated in cases where complications (pathological fractures, growth defect, malignant transformation) arise.
Treatment for most of the leukodystrophies is symptomatic and supportive, and may include medications, physical, occupational, and speech therapies; and nutritional, educational, and recreational programs. Bone marrow transplantation is showing promise for a few of the leukodystrophies.
The prognosis for children with LKS varies. Some affected children may have a permanent severe language disorder, while others may regain much of their language abilities (although it may take months or years). In some cases, remission and relapse may occur. The prognosis is improved when the onset of the disorder is after age 6 and when speech therapy is started early. Seizures generally disappear by adulthood.
The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct research related to peripheral neuropathies in laboratories at the NIH and also support additional research through grants to major medical institutions across the country. Current research projects funded by the NINDS involve investigations of genetic factors associated with hereditary neuropathies, studies of biological mechanisms involved in diabetes-associated neuropathies, and investigations exploring how the immune system contributes to peripheral nerve damage. Neuropathic pain is a primary target of NINDS-sponsored studies aimed at developing more effective therapies for symptoms of peripheral neuropathy. Some scientists hope to identify substances that will block the brain chemicals that generate pain signals, while others are investigating the pathways by which pain signals reach the brain.
Benign prostatic hyperplasia is the most common prostate problem for men older than age 50. In 2010, as many as 14 million men in the United States had lower urinary tract symptoms suggestive of benign prostatic hyperplasia.1 Although benign prostatic hyperplasia rarely causes symptoms before age 40, the occurrence and symptoms increase with age. Benign prostatic hyperplasia affects about 50 percent of men between the ages of 51 and 60 and up to 90 percent of men older than 80.2
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.
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.
Char syndrome is rare, although its exact incidence is unknown. Only a few families with this condition have been identified worldwide.
Alternating hemiplegia of childhood is primarily caused by mutations in the ATP1A3 gene. Very rarely, a mutation in the ATP1A2 gene is involved in the condition. These genes provide instructions for making very similar proteins. They function as different forms of one piece, the alpha subunit, of a larger protein complex called Na+/K+ ATPase; the two versions of the complex are found in different parts of the brain. Both versions play a critical role in the normal function of nerve cells (neurons). Na+/K+ ATPase transports charged atoms (ions) into and out of neurons, which is an essential part of the signaling process that controls muscle movement. Mutations in the ATP1A3 or ATP1A2 gene reduce the activity of the Na+/K+ ATPase, impairing its ability to transport ions normally. It is unclear how a malfunctioning Na+/K+ ATPase causes the episodes of paralysis or uncontrollable movements characteristic of alternating hemiplegia of childhood.
What causes glycogen storage disease type 4? Glycogen storage disease type 4 (GSD 4) is caused by mutations in the GBE1 gene. The GBE1 gene normally provides instructions for making the glycogen branching enzyme. This enzyme is necessary for making glycogen, a major source of stored energy in the body. Glycogen is formed by assembling many molecules of glucose. The glycogen branching enzyme is involved in the formation of "branches" of glucose chains, which help to make glycogen more compact for storage and allows it to break down more easily when it is needed for energy. The GBE1 gene mutations that cause GSD 4 lead to a decrease in the amount or functionality of the glycogen branching enzyme. Glycogen is then not formed properly, and substances called polyglucosan bodies build up in cells throughout the body, causing the signs and symptoms of the condition.
Epilepsy is a brain disorder that causes people to have recurring seizures. The seizures happen when clusters of nerve cells, or neurons, in the brain send out the wrong signals. People may have strange sensations and emotions or behave strangely. They may have violent muscle spasms or lose consciousness. Epilepsy has many possible causes, including illness, brain injury, and abnormal brain development. In many cases, the cause is unknown. Doctors use brain scans and other tests to diagnose epilepsy. It is important to start treatment right away. There is no cure for epilepsy, but medicines can control seizures for most people. When medicines are not working well, surgery or implanted devices such as vagus nerve stimulators may help. Special diets can help some children with epilepsy. NIH: National Institute of Neurological Disorders and Stroke
Paget's disease is almost always diagnosed by x-ray, although it may be discovered using one of two other tests: an alkaline phosphatase blood test or a bone scan. Paget's disease is often found by accident when a person undergoes one of these tests for another reason. In other cases, a person experiences problems that lead his or her physician to order these tests. If Paget's disease is first suggested by an alkaline phosphatase blood test or bone scan, the physician usually orders an x-ray to verify the diagnosis. A bone scan is typically used to identify all the bones in the skeleton that are affected by the disease.
Fanconi anemia is most often 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. Very rarely, this condition is inherited in an X-linked recessive pattern. The gene associated with X-linked recessive Fanconi anemia 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.
What causes tarsal tunnel syndrome? There are a variety of factors that may cause tarsal tunnel syndrome. These may include repetitive stress with activities, trauma (e.g., crush injury, stretch injury, fractures, ankle dislocations or sprains), flat feet, and excess weight. Additionally, any lesion that occupies space within the tarsal tunnel region may cause pressure on the nerve and subsequent symptoms. Examples include tendonitis, hematoma, tumor, varicose veins, and lower extremity edema.
Several components of the NIH support research on developmental disorders such as ADHD. Research programs of the NINDS, the National Institute of Mental Health (NIMH), and the National Institute of Child Health and Human Development (NICHD) seek to address unanswered questions about the causes of ADHD, as well as to improve diagnosis and treatment.
Mutations in the ARSB gene cause MPS VI. The ARSB gene provides instructions for producing an enzyme called arylsulfatase B, which is involved in the breakdown of large sugar molecules called glycosaminoglycans (GAGs). GAGs were originally called mucopolysaccharides, which is where this condition gets its name. Mutations in the ARSB gene reduce or completely eliminate the function of arylsulfatase B. The lack of arylsulfatase B activity leads to the accumulation of GAGs within cells, specifically inside the lysosomes. Lysosomes are compartments in the cell that digest and recycle different types of molecules. Conditions such as MPS VI that cause molecules to build up inside the lysosomes are called lysosomal storage disorders. The accumulation of GAGs within lysosomes increases the size of the cells, which is why many tissues and organs are enlarged in this disorder. Researchers believe that the buildup of GAGs may also interfere with the functions of other proteins inside lysosomes, triggering inflammation and cell death.
Glucocorticoid-remediable aldosteronism is one of three types of familial hyperaldosteronism and was first described in 1966. Aldosterone is a hormone manufactured by the adrenal glands which helps the body retain water and sodium and excrete potassium. It is caused by a fusion of the CYP11B1 and CYP11B2 genes and is inherited in an autosomal dominant manner. Individuals with this condition usually have hypertension (high blood pressure) before age 21. These individuals are also at an increased risk for a certain type of stroke known as a hemorrhagic stroke. First-line therapy consists of a steroid such as prednisone, dexamethasone, or hydrocortisone. This will often correct the overproduction of aldosterone, lower the blood pressure, and correct the potassium levels.
Many people get diverticular disease. Starting at age 40, the chance of getting it increases about every 10 years. About half of people between the ages of 60 and 80 have diverticular disease. Almost everyone over 80 has it.
Friedreich ataxia is an inherited condition that affects the nervous system and causes movement problems. People with this condition develop impaired muscle coordination (ataxia) that worsens over time. Other features include the gradual loss of strength and sensation in the arms and legs, muscle stiffness (spasticity), and impaired speech. Many individuals have a form of heart disease called hypertrophic cardiomyopathy. Some develop diabetes, impaired vision, hearing loss, or an abnormal curvature of the spine (scoliosis). Most people with Friedreich ataxia begin to experience the signs and symptoms around puberty. This condition is caused by mutations in the FXN gene and is inherited in an autosomal recessive pattern.
Your health care provider may start you on a special diet, so you get extra nutrition and calories. High-calorie liquid supplements are often used to give you the extra calories and right amount of vitamins and minerals to keep you healthy. During acute phases of the disease, you may need to receive intravenous nutrition to give the intestine a rest. No foods are known to cause injury or inflammation to the intestine. But foods such as hot spices, alcohol, greasy foods, and milk products may make diarrhea and cramping worse. You should eat a healthy diet and avoid foods that make symptoms worse. Your health care provider may refer you to a dietitian to help you with meal planning.
How might amniotic band syndrome be treated? Mild cases may not require treatment, however all bands need monitoring as growth occurs to watch for progressive constriction and swelling. Other constrictions may require surgical management; surgical options will vary depending on the abnormality. People with amniotic band syndrome who have amputations may benefit from the use of prosthetics.
Goodpasture syndrome is usually treated with - immunosuppressive medications, such as cyclophosphamide, to keep the immune system from making antibodies - corticosteroid medications to suppress the bodys autoimmune response - plasmapheresisa procedure that uses a machine to remove blood from the body, separate certain cells from the plasma, and return just the cells to the persons body; the anti-GBM antibodies remain in the plasma and are not returned to the persons body Plasmapheresis is usually continued for several weeks, and immunosuppressive medications may be given for 6 to 12 months, depending on the response to therapy. In most cases, bleeding in the lungs stops and no permanent lung damage occurs. Damage to the kidneys, however, may be long lasting. If the kidneys fail, blood-filtering treatments called dialysis or kidney transplantation may become necessary.
When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion. Your digestive system is a series of hollow organs joined in a long, twisting tube. It runs from your mouth to your anus and includes your esophagus, stomach, and small and large intestines. Your liver, gallbladder and pancreas are also involved. They produce juices to help digestion. There are many types of digestive disorders. The symptoms vary widely depending on the problem. In general, you should see your doctor if you have - Blood in your stool - Changes in bowel habits - Severe abdominal pain - Unintentional weight loss - Heartburn not relieved by antacids NIH: National Institute of Diabetes and Digestive and Kidney Diseases
Phosphorus is a mineral found in many foods. If you have too much phosphorus in your blood, it pulls calcium from your bones. Losing calcium will make your bones weak and likely to break. Also, too much phosphorus may make your skin itch. Foods like milk and cheese, dried beans, peas, colas, nuts, and peanut butter are high in phosphorus. Usually, people on dialysis are limited to 1/2 cup of milk per day. The renal dietitian will give you more specific information regarding phosphorus. You probably will need to take a phosphate binder like Renagel, PhosLo, Tums, or calcium carbonate to control the phosphorus in your blood between dialysis sessions. These medications act like sponges to soak up, or bind, phosphorus while it is in the stomach. Because it is bound, the phosphorus does not get into the blood. Instead, it is passed out of the body in the stool.
How is Alport syndrome inherited? Alport syndrome can have different inheritance patterns. About 80 percent of cases are caused by mutations in the COL4A5 gene and are inherited in an X-linked recessive pattern. This gene 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 COL4A5 gene in each cell is sufficient to cause kidney failure and other severe symptoms of the disorder. In females (who have two X chromosomes), a mutation in only one copy of the COL4A5 gene usually only results in hematuria, but some women experience more severe symptoms. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons.
At first, you will see a few specks of blood, or spots, "floating" in your vision. If spots occur, see your eye care professional as soon as possible. You may need treatment before more serious bleeding or hemorrhaging occurs. Hemorrhages tend to happen more than once, often during sleep. Sometimes, the spots clear without treatment, and you will see better. However, bleeding can reoccur and cause severely blurred vision. You need to be examined by your eye care professional at the first sign of blurred vision, before more bleeding occurs. If left untreated, proliferative retinopathy can cause severe vision loss and even blindness. Also, the earlier you receive treatment, the more likely treatment will be effective.
Summary : Genetic tests are tests on blood and other tissue to find genetic disorders. Over 2000 tests are available. Doctors use genetic tests for several reasons. These include - Finding genetic diseases in unborn babies - Finding out if people carry a gene for a disease and might pass it on to their children - Screening embryos for disease - Testing for genetic diseases in adults before they cause symptoms - Making a diagnosis in a person who has disease symptoms - Figuring out the type or dose of a medicine that is best for a certain person People have many different reasons for being tested or not being tested. For some, it is important to know whether a disease can be prevented or treated if a test is positive. In some cases, there is no treatment. But test results might help a person make life decisions, such as family planning or insurance coverage. A genetic counselor can provide information about the pros and cons of testing. NIH: National Human Genome Research Institute
Microphthalmia occurs in approximately 1 in 10,000 individuals.
What are the signs and symptoms of Microphthalmia associated with colobomatous cyst? The Human Phenotype Ontology provides the following list of signs and symptoms for Microphthalmia associated with colobomatous cyst. 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 - Microphthalmia - 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.
Familial erythrocytosis is a rare condition; its prevalence is unknown.
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.
Use of tobacco products and drinking too much alcohol can affect the risk of laryngeal cancer.Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your doctor if you think you may be at risk.
With treatment, most people recover from pinched nerve. However, in some cases, the damage is irreversible.
Is postural orthostatic tachycardia syndrome inherited? Most cases of postural orthostatic tachycardia syndrome (POTS) are not thought to be inherited. Although the condition generally occurs sporadically, some people with POTS do report a family history of orthostatic intolerance (an excessively reduced volume of blood returns to the heart when moving from a lying down to a standing position). This suggests that inherited factors may play a role in the development of POTS in some families.
Waardenburg syndrome (WS) is a group of genetic conditions characterized by varying degrees of hearing loss and differences in the coloring (pigmentation) of the eyes, hair, and skin. Signs and symptoms can vary both within and between families. Common features include congenital sensorineural deafness; pale blue eyes, different colored eyes, or two colors within one eye; a white forelock (hair just above the forehead); or early graying of scalp hair before age 30. Various other features may also be present. WS is classified into 4 subtypes (types 1, 2, 3 and 4) based on whether certain features are present and the genetic cause. Mutations in at least 6 different genes are known to cause WS, and it may be inherited in an autosomal dominant (most commonly) or autosomal recessive manner. Treatment depends on the specific symptoms present.
How are mycobacterium malmoense infections contracted? M. Malmoense infection may be acquired by breathing in or ingesting the bacteria, or through trauma, such as an injury or surgical incision. People who have suppressed immune systems are at an increased risk for developing signs and symptoms from these infections.
Klinefelter syndrome affects 1 in 500 to 1,000 newborn males. Most variants of Klinefelter syndrome are much rarer, occurring in 1 in 50,000 or fewer newborns. Researchers suspect that Klinefelter syndrome is underdiagnosed because the condition may not be identified in people with mild signs and symptoms. Additionally, the features of the condition vary and overlap significantly with those of other conditions.
Summary : Antioxidants are man-made or natural substances that may prevent or delay some types of cell damage. Antioxidants are found in many foods, including fruits and vegetables. They are also available as dietary supplements. Examples of antioxidants include - Beta-carotene - Lutein - Lycopene - Selenium - Vitamin A - Vitamin C - Vitamin E Vegetables and fruits are rich sources of antioxidants. There is good evidence that eating a diet with lots of vegetables and fruits is healthy and lowers risks of certain diseases. But it isn't clear whether this is because of the antioxidants, something else in the foods, or other factors. High-dose supplements of antioxidants may be linked to health risks in some cases. For example, high doses of beta-carotene may increase the risk of lung cancer in smokers. High doses of vitamin E may increase risks of prostate cancer and one type of stroke. Antioxidant supplements may also interact with some medicines. To minimize risk, tell you of your health care providers about any antioxidants you use. NIH: National Center for Complementary and Integrative Health
Primary ciliary dyskinesia occurs in approximately 1 in 16,000 individuals.
These resources address the diagnosis or management of SLC4A1-associated distal renal tubular acidosis: - Genetic Testing Registry: Renal tubular acidosis, distal, autosomal dominant - Genetic Testing Registry: Renal tubular acidosis, distal, with hemolytic anemia 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
Pectus carinatum refers to a chest wall abnormality in which the breastbone is pushed outward. It generally presents during childhood and worsens through adolescence. If the condition occurs in isolation, it is often not associated with any additional signs or symptoms. Rarely, affected people report shortness of breath during exercise, frequent respiratory infections, and/or asthma. The underlying cause of isolated pectus carinatum is unknown. Pectus carinatum can also be associated with a variety of genetic disorders and syndromes, including Marfan syndrome, Noonan syndrome, Morquio syndrome, homocystinuria, osteogenesis imperfecta, Coffin-Lowery syndrome, cardiofaciocutaneous syndrome, and certain chromosome abnormalities. In these cases, the condition has an underlying genetic cause and is associated with additional features that are characteristic of the genetic disease. Pectus carinatum is primarily a cosmetic concern and treatment, therefore, depends on the severity of the condition and the interests of the affected person and their family. In those who choose to pursue treatment, bracing and/or surgery may be an option.
During the prodrome and vomiting phases of cyclic vomiting syndrome, a person will generally take in little or no nutrition by mouth. During the recovery phase, the person may be quite hungry as soon as the vomiting stops. As eating resumes, a person or his or her family should watch for the return of nausea. In some cases, a person can start with clear liquids and proceed slowly to a regular diet. During the well phase, a balanced diet and regular meals are important. People should avoid any trigger foods and foods with additives. Eating small, carbohydrate-containing snacks between meals, before exercise, and at bedtime may help prevent future attacks. A health care provider will assist with planning a return to a regular diet.
Mutations in the BCKDHA, BCKDHB, and DBT genes can cause maple syrup urine disease. These three genes provide instructions for making proteins that work together as a complex. The protein complex is essential for breaking down the amino acids leucine, isoleucine, and valine, which are present in many kinds of food, particularly protein-rich foods such as milk, meat, and eggs. Mutations in any of these three genes reduce or eliminate the function of the protein complex, preventing the normal breakdown of leucine, isoleucine, and valine. As a result, these amino acids and their byproducts build up in the body. Because high levels of these substances are toxic to the brain and other organs, their accumulation leads to the serious health problems associated with maple syrup urine disease.
The prevalence of hereditary folate malabsorption is unknown. Approximately 15 affected families have been reported worldwide. Researchers believe that some infants with this disorder may not get diagnosed or treated, particularly in areas where advanced medical care is not available.
Charcot-Marie-Tooth disease type 1E (CMT1E) is a form of Charcot-Marie-Tooth disease, which is a group of rare conditions that affect the peripheral nerves. Signs and symptoms of CMT1E generally become apparent between age 5 and 25 years, although the age of onset and disease severity can vary significantly from person to person. In general, CMT1E is associated with the typical features of Charcot-Marie-Tooth disease type 1 (progressive weakness of the feet and/or ankles; foot drop; atrophy of muscles below the knee; absent tendon reflexes of upper and lower extremities; and a decreased sensitivity to touch, heat, and cold in the feet and/or lower legs) in addition to hearing loss. CMT1E is caused by certain changes (mutations) in the PMP22 gene and is inherited in an autosomal dominant manner. Treatment is based on the signs and symptoms present in each person.
What are the signs and symptoms of Potato nose? The Human Phenotype Ontology provides the following list of signs and symptoms for Potato nose. 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 nose - 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.
PDGFRB-associated chronic eosinophilic leukemia is not inherited and occurs in people with no history of the condition in their families. Chromosomal rearrangements that lead to a PDGFRB fusion gene are somatic mutations, which are mutations acquired during a person's lifetime and present only in certain cells. The somatic mutation occurs initially in a single cell, which continues to grow and divide, producing a group of cells with the same mutation (a clonal population).
How might isovaleric acidemia be treated? There is currently no cure for isovaleric acidemia (IVA). Upon diagnosis, immediate treatment is typically necessary in order to prevent metabolic crises and complications that may follow. It is often recommended that affected individuals have a low-leucine / low-protein diet and use medical foods (such as special low-protein flours, pastas, and rice that are made especially for people with organic acid disorders) and leucine-free medical formula. A dietician with knowledge of IVA can help parents create a food plan that contains the right amount of protein, nutrients, and energy to keep the child healthy. Any diet changes should be under the guidance of a dietician. Medications that may be recommended include glycine and L-carnitine, which help rid the body of unwanted isovaleric acid and other harmful substances. No medication or supplement should be used without checking with a metabolic doctor. Children with symptoms of a metabolic crisis need medical treatment right away and may be given bicarbonate, glucose, and other medications by IV. With prompt and careful treatment, children with IVA have a good chance to live healthy lives with normal growth and development. However, some children, even when treated, may have repeated metabolic crises which can lead to life-long learning problems or mental retardation.
There is no known cure for Guillain-Barr syndrome, but therapies can lessen the severity of the illness and accelerate the recovery in most patients. There are also a number of ways to treat the complications of the disease. Currently, plasmapheresis (also known as plasma exchange) and high-dose immunoglobulin therapy are used. Plasmapheresis seems to reduce the severity and duration of the Guillain-Barr episode. In high-dose immunoglobulin therapy, doctors give intravenous injections of the proteins that in small quantities, the immune system uses naturally to attack invading organism. Investigators have found that giving high doses of these immunoglobulins, derived from a pool of thousands of normal donors, to Guillain-Barr patients can lessen the immune attack on the nervous system. The most critical part of the treatment for this syndrome consists of keeping the patient's body functioning during recovery of the nervous system. This can sometimes require placing the patient on a ventilator, a heart monitor, or other machines that assist body function.
Generally, treatment for individuals with apraxia includes physical, speech,or occupational therapy. If apraxia is a symptom of another disorder, the underlying disorder should be treated.
What are the signs and symptoms of lichen planus pigmentosus? Lichen planus pigmentosus (LPP), a rare form of lichen planus, is characterized by oval or irregularly shaped brown to gray-brown macules and patches on the skin. Areas that are exposed to sun such as the forehead, temples and neck are most commonly affected. However, the macules and patches may also develop on the trunk or in places where two areas of skin touch or rub together (i.e. the armpit, groin, etc). LPP is a chronic, relapsing condition with periods of exacerbations (worsening symptoms) separated by periods of remission (a decrease in or disappearance of symptoms). Although the skin findings of LPP are usually not associated with any additional symptoms, some affected people may experience mild itching and/or burning or develop other features of lichen planus. Please click here to learn more about the signs and symptoms that may be found in lichen planus. LPP usually affects young to middle-aged adults who have dark skin, especially those of Indian, Latin American, and the Middle Eastern descent.
People with 16p11.2 deletion syndrome are missing a sequence of about 600,000 DNA building blocks (base pairs), also written as 600 kilobases (kb), at position p11.2 on chromosome 16. This deletion affects one of the two copies of chromosome 16 in each cell. The 600 kb region contains more than 25 genes, and in many cases little is known about their function. Researchers are working to determine how the missing genes contribute to the features of 16p11.2 deletion syndrome.
These resources address the diagnosis or management of aminoacylase 1 deficiency: - Genetic Testing Registry: Aminoacylase 1 deficiency 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
Hypomyelination and congenital cataract is an inherited condition that affects the nervous system and the eyes. This disease is one of a group of genetic disorders called leukoencephalopathies. Leukoencephalopathies involve abnormalities of the brain's white matter. White matter consists of nerve fibers covered by a fatty substance called myelin. Myelin insulates nerve fibers and promotes the rapid transmission of nerve impulses. Hypomyelination and congenital cataract is caused by a reduced ability to form myelin (hypomyelination). Additionally, people with this disorder are typically born with a clouding of the lens (cataract) in both eyes. People with this condition usually have normal development throughout the first year of life. Development slows around the age of 1. Most affected children learn to walk between the ages of 1 and 2, although they usually need some type of support. Over time they experience muscle weakness and wasting (atrophy) in their legs, and many affected people eventually require wheelchair assistance. Weakness in the muscles of the trunk and a progressive abnormal curvature of the spine (scoliosis) further impair walking in some individuals. Most people with hypomyelination and congenital cataract have reduced sensation in their arms and legs (peripheral neuropathy). In addition, affected individuals typically have speech difficulties (dysarthria) and mild to moderate intellectual disability.