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Babesiosis is caused by microscopic parasites that infect red blood cells. Most human cases of Babesia infection in the United States are caused by the parasite Babesia microti. Occasional cases caused by other species (types) of Babesia have been detected. Babesia microti is spread in nature by Ixodes scapularis ticks (also called blacklegged ticks or deer ticks). Tickborne transmission is most common in particular regions and seasons: it mainly occurs in parts of the Northeast and upper Midwest; and it usually peaks during the warm months. Babesia infection can range in severity from asymptomatic to life threatening. The infection is both treatable and preventable. Frequently Asked Questions (FAQs) Podcasts
What causes Froelich syndrome? Froehlich syndrome is usually caused by lesions in the hypothalamic gland or pituitary gland. The lesions may be caused by a tumor (e.g., craniopharyngioma), swelling from an infection (e.g., tuberculosis), encephalitis, or other brain injuries.
Cherubism is a disorder characterized by abnormal bone tissue in the lower part of the face. Beginning in early childhood, both the lower jaw (the mandible) and the upper jaw (the maxilla) become enlarged as bone is replaced with painless, cyst-like growths. These growths give the cheeks a swollen, rounded appearance and often interfere with normal tooth development. In some people the condition is so mild that it may not be noticeable, while other cases are severe enough to cause problems with vision, breathing, speech, and swallowing. Enlargement of the jaw usually continues throughout childhood and stabilizes during puberty. The abnormal growths are gradually replaced with normal bone in early adulthood. As a result, many affected adults have a normal facial appearance. Most people with cherubism have few, if any, signs and symptoms affecting other parts of the body. Rarely, however, this condition occurs as part of another genetic disorder. For example, cherubism can occur with Ramon syndrome, which also involves short stature, intellectual disability, and overgrowth of the gums (gingival fibrosis). Additionally, cherubism has been reported in rare cases of Noonan syndrome (a developmental disorder characterized by unusual facial characteristics, short stature, and heart defects) and fragile X syndrome (a condition primarily affecting males that causes learning disabilities and cognitive impairment).
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. Most often, the parents of a child with an autosomal recessive disorder are not affected, but are carriers of one copy of the mutated gene. Some carriers of a KCNQ1 or KCNE1 mutation have signs and symptoms affecting the heart, but their hearing is usually normal.
SYNGAP1-related intellectual disability is caused by mutations in the SYNGAP1 gene. The protein produced from this gene, called SynGAP, plays an important role in nerve cells in the brain. It is found at the junctions between nerve cells (synapses) and helps regulate changes in synapses that are critical for learning and memory. Mutations involved in this condition prevent the production of functional SynGAP protein from one copy of the gene, reducing the protein's activity in cells. Studies show that a reduction of SynGAP activity can have multiple effects in nerve cells, including pushing synapses to develop too early. The resulting abnormalities disrupt the synaptic changes in the brain that underlie learning and memory, leading to cognitive impairment and other neurological problems characteristic of SYNGAP1-related intellectual disability.
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.
Is essential tremor inherited? About half of all cases of essential tremor appear to occur because of a genetic mutation. This is referred to as familial tremor. In these cases, essential tremor appears to be passed through generations in families, but the inheritance pattern varies. In many affected families, the condition appears to be inherited in an autosomal dominant manner, which means one copy of an altered gene in each cell is sufficient to cause the disorder. In other families, the inheritance pattern is unclear. Essential tremor may also appear in people with no history of the disorder in their family. In some families, there are individuals who have essential tremor while others have other movement disorders, such as involuntary muscle tensing (dystonia). The potential genetic connection between essential tremor and other movement disorders is an active area of research..
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.
- A urinary tract infection (UTI) is an infection in the urinary tract. Infections are caused by microbesorganisms too small to be seen without a microscope. - Most UTIs are caused by bacteria that live in the bowel, the part of the digestive tract where stool is changed from liquid to solid. - Any child can get a UTI, though girls get UTIs more often than boys. - Most UTIs are not serious, but some infections can lead to serious problems. - A child with a UTI may not have any symptoms. When symptoms are present, they can range from mild to severe. - A UTI is diagnosed by testing a sample of your childs urine. - Bacteria-fighting medicines called antibiotics are used to treat a UTI. - Talk with your childs health care provider after your childs UTI is gone. The health care provider may want to do more tests to check for vesicoureteral reflux (VUR) or a blockage in the urinary tract. - You can take steps to help prevent your child from getting a UTI.
Treatment of chronic neutrophilic leukemia may include the following: - Donor bone marrow transplant. - Chemotherapy. - Biologic therapy using interferon alfa. - A clinical trial of a new treatment. Check the list of NCI-supported cancer clinical trials that are now accepting patients with chronic neutrophilic leukemia. 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.
How is Ehlers-Danlos syndrome progeroid type inherited? Ehlers-Danlos syndrome progeroid type is inherited in an autosomal recessive pattern. This means that an individual must have two non-functional copies of the B4GALT7 gene to be affected with the condition. One copy is inherited from each parent. If an individual has only one non-functional B4GALT7 gene (such as each parent), he or she is a "carrier". Carriers do not typically show any signs or symptoms of a recessive condition. When two carriers for a recessive condition have children, with each pregnancy there is a 25% (1 in 4) risk for the child to be affected, a 50% (1 in 2) risk for the child to be a carrier (like each parent) and a 25% risk that the child will be unaffected and also not be a carrier. An individual with a recessive condition will generally have unaffected children, except in the rare circumstance where his or her partner is a carrier of a nonfunctional B4GALT7 gene.
You can't prevent inherited types of hemolytic anemia. One exception is glucose-6-phosphate dehydrogenase (G6PD) deficiency. If you're born with G6PD deficiency, you can avoid substances that may trigger the condition. For example, avoid fava beans, naphthalene (a substance found in some moth balls), and certain medicines (as your doctor advises). Some types of acquired hemolytic anemia can be prevented. For example, reactions to blood transfusions, which can cause hemolytic anemia, can be prevented. This requires careful matching of blood types between the blood donor and the recipient. Prompt and proper prenatal care can help you avoid the problems of Rh incompatibility. This condition can occur during pregnancy if a woman has Rh-negative blood and her baby has Rh-positive blood. "Rh-negative" and "Rh-positive" refer to whether your blood has Rh factor. Rh factor is a protein on red blood cells. Rh incompatibility can lead to hemolytic anemia in a fetus or newborn.
Noonan syndrome is a genetic disorder that causes abnormal development of multiple parts of the body. Features of Noonan syndrome may include a distinctive facial appearance, short stature, a broad or webbed neck, congenital heart defects, bleeding problems, skeletal malformations, and developmental delay. Noonan syndrome may be caused by mutations in any one of several genes including the PTPN11, KRAS, RAF1, SOS1, NRAS and BRAF genes. It is sometimes referred to as a specific subtype based on the responsible gene in an affected person. Noonan syndrome is typically inherited in an autosomal dominant manner but many cases are due to a new mutation and are not inherited from an affected parent.
What causes achalasia? The lower esophageal sphincter, the ring-shaped muscle at the bottom of the esophagus, normally relaxes during swallowing. In people with achalasia, this muscle ring does not relax as well. The reason for this problem is damage to the nerves of the esophagus. In some people, this problem appears to be inherited. There is additionally a suspected autoimmune component involved in the development of achalasia as individuals with achalasia are more likely to have a concomitant autoimmune disease than the general population.
How is isovaleric acidemia inherited? Isovaleric acidemia 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.
Snyder-Robinson syndrome is an inherited condition that is characterized by intellectual disability, muscle and bone abnormalities, and other problems with development. It only occurs in males. Affected individuals have delayed development that begins in early childhood. Speech difficulties are common. Low muscle tone (hypotonia) and muscle mass leads to difficulty walking and an unsteady gait. Other features include thinning of the bones (osteoporosis), an abnormal curvature of the spine (kyphoscoliosis), and unusual facial features including a prominent lower lip, cleft palate, and facial asymmetry. Snyder-Robinson syndrome is caused by mutations in the SMS gene and is inherited in an X-linked recessive fashion.
- Primary sclerosing cholangitis (PSC) inflames, scars, and blocks bile ducts inside and outside the liver. - When bile ducts become blocked, bile builds up in the liver and damages liver cells. - PSC can lead to vitamin deficiencies, infections, bile duct cancer, cirrhosis, liver failure, and the need for a liver transplant. - The cause of PSC is not known. - Many people with PSC also have ulcerative colitis, an inflammatory bowel disease. - Treatment includes medications to treat symptoms and complications of PSC.
If you have diabetes, get a comprehensive dilated eye exam at least once a year. Proliferative retinopathy can develop without symptoms. If it gets to this advanced stage, you are at high risk for vision loss or even blindness. Macular edema can develop without symptoms at any of the four stages of diabetic retinopathy. You can develop both proliferative retinopathy and macular edema and still see fine. However, you are at high risk for vision loss. Your eye care professional can tell if you have macular edema or any stage of diabetic retinopathy. Whether or not you have symptoms, early detection and timely treatment can prevent vision loss. See this glossary for basic terms about diabetic retinopathy.
How might Marden-Walker syndrome be treated? Very little information is available regarding the treatment of Marden-Walker syndrome. In general, treatment is symptomatic, with a multidisciplinary approach. The team of providers may include a regular pediatrician, a geneticist, a neurologist, an orthopedist and/or a physical medicine specialist. Special diets and feeding techniques may be of benefit. Early childhood intervention services may help with developmental problems. Other treatments are dependent upon the specific symptoms present in each patient.
How might Unna-Thost palmoplantar keratoderma be treated? The following treatments can help to soften the thickened skin and make it less noticeable: Emollients Keratolytics (such as salicylic acid in propylene glycol) Topical retinoids Topical vitamin D ointment (calcipotriol) Systemic retinoids (acitretin) Antifungal medication may help if the condition occurs along with a fungal infection.
Malaria is a serious disease caused by a parasite. You get it when an infected mosquito bites you. Malaria is a major cause of death worldwide, but it is almost wiped out in the United States. The disease is mostly a problem in developing countries with warm climates. If you travel to these countries, you are at risk. There are four different types of malaria caused by four related parasites. The most deadly type occurs in Africa south of the Sahara Desert. Malaria symptoms include chills, flu-like symptoms, fever, vomiting, diarrhea, and jaundice. A blood test can diagnose it. It can be life-threatening. However, you can treat malaria with drugs. The type of drug depends on which kind of malaria you have and where you were infected. Malaria can be prevented. When traveling to areas where malaria is found - See your doctor for medicines that protect you - Wear insect repellent with DEET - Cover up - Sleep under mosquito netting Centers for Disease Control and Prevention
These resources address the diagnosis or management of neurofibromatosis type 2: - Boston Children's Hospital - Gene Review: Gene Review: Neurofibromatosis 2 - Genetic Testing Registry: Neurofibromatosis, type 2 - MedlinePlus Encyclopedia: Acoustic Neuroma - MedlinePlus Encyclopedia: Neurofibromatosis 2 - Neurofibromatosis Clinic, Massachusetts General 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
What causes VLCAD deficiency? VLCAD deficiency is caused by changes (mutations) in the ACADVL gene. This gene encodes an enzyme that is required for the proper break down (metabolism) of a certain group of fats called very long-chain fatty acids. Mutations in the ACADVL gene lead to reduced levels of this enzyme which prevents the proper metabolism of these fats. Because very long-chain fatty acids are an important source of energy, particularly for the heart and muscles, this may result in certain symptoms such as lethargy and hypoglycemia. Fats that are not properly broken down can also build-up and damage tissues such as the heart, liver, and muscles, which can cause the other features seen in people with VLCAD deficiency.
Anencephaly is a type of neural tube defect characterized by abnormal development of the brain and the bones of the skull. The neural tube is a narrow channel that normally folds and closes between the 3rd and 4th weeks of pregnancy, forming the brain and spinal cord of the embryo. Anencephaly occurs when the 'cephalic' or head end of the neural tube fails to close, causing the absence of a major portion of the brain, skull, and scalp. Infants with this disorder are born without a forebrain (the front part of the brain) and a cerebrum (the thinking and coordinating part of the brain). The remaining brain tissue is often exposed (not covered by bone or skin). Affected babies are usually blind, deaf, unconscious, and unable to feel pain. Almost all babies with anencephaly die before birth, although some may survive a few hours or a few days after birth. Anencephaly is likely caused by an interaction between genetic and environmental factors, many of which remain unknown.
What causes hyper IgD syndrome? Hyper IgD syndrome is caused by mutations in the gene encoding the enzyme mevalonate kinase (MVK). The mutations lead to a decrease in the enzymatic activity of the gene. The gene is located at chromosome 12q24.
The prevalence of progressive familial heart block is unknown. In the United States, about 1 in 5,000 individuals have complete heart block from any cause; worldwide, about 1 in 2,500 individuals have complete heart block.
AADC deficiency is a rare disorder. Only about 100 people with this condition have been described in the medical literature worldwide; about 20 percent of these individuals are from Taiwan.
These resources address the diagnosis or management of SCA6: - Gene Review: Gene Review: Spinocerebellar Ataxia Type 6 - Genetic Testing Registry: Spinocerebellar ataxia 6 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
Developmental dyspraxia is a disorder characterized by an impairment in the ability to plan and carry out sensory and motor tasks. Generally, individuals with the disorder appear "out of sync" with their environment. Symptoms vary and may include poor balance and coordination, clumsiness, vision problems, perception difficulties, emotional and behavioral problems, difficulty with reading, writing, and speaking, poor social skills, poor posture, and poor short-term memory. Although individuals with the disorder may be of average or above average intelligence, they may behave immaturely.
Sarcoidosis is an inflammatory disease characterized by the development and growth of tiny lumps of cells called granulomas. If these tiny granulomas grow and clump together in an organ, they can affect how the organ works, leading to the symptoms of sarcoidosis. The granulomas can be found in almost any part of the body, but occur more commonly in the lungs, lymph nodes, eyes, skin, and liver. Although no one is sure what causes sarcoidosis, it is thought by most scientists to be a disorder of the immune system. The course of the disease varies from person to person. It often goes away on its own, but in some people symptoms of sarcoidosis may last a lifetime. For those who need treatment, anti-inflammatory medications and immunosuppressants can help.
Lead is a metal that occurs naturally in the earth's crust. Lead can be found in all parts of our environment. Much of it comes from human activities such as mining and manufacturing. Lead used to be in paint; older houses may still have lead paint. You could be exposed to lead by - Eating food or drinking water that contains lead. Water pipes in older homes may contain lead. - Working in a job where lead is used - Using lead in a hobby, such as making stained glass or lead-glazed pottery - Using folk remedies such as herbs or foods that contain lead Breathing air, drinking water, eating food, or swallowing or touching dirt that contains lead can cause many health problems. Lead can affect almost every organ and system in your body. In adults, lead can increase blood pressure and cause infertility, nerve disorders, and muscle and joint pain. It can also make you irritable and affect your ability to concentrate and remember. Lead is especially dangerous for children. A child who swallows large amounts of lead may develop anemia, severe stomachache, muscle weakness, and brain damage. Even at low levels, lead can affect a child's mental and physical growth. Agency for Toxic Substances Disease Registry
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. However, some cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
You may have one or more of the following warning signs: - chest pain or discomfort - pain or discomfort in your arms, back, jaw, or neck - indigestion or stomach pain - shortness of breath - sweating - nausea - light-headedness Or, you may have no warning signs at all. Warning signs may come and go. If you have any of these warning signs, call 911 right away. Getting prompt treatment can reduce damage to the heart.
MJD is incurable, but some symptoms of the disease can be treated. For those individuals who show parkinsonian features, levodopa therapy can help for many years. Treatment with antispasmodic drugs, such as baclofen, can help reduce spasticity. Botulinum toxin can also treat severe spasticity as well as some symptoms of dystonia. Speech problems and trouble swallowing can be treated with medication and speech therapy. Physiotherapy can help patients cope with disability associated with gait problems. Physical aids, such as walkers and wheelchairs, can assist with everyday activities.
These resources address the diagnosis or management of MNGIE disease: - Gene Review: Gene Review: Mitochondrial Neurogastrointestinal Encephalopathy Disease - Genetic Testing Registry: Myoneural gastrointestinal encephalopathy syndrome - MedlinePlus Encyclopedia: Leukoencephalopathy (image) 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
Epidermolytic hyperkeratosis affects approximately 1 in 200,000 to 300,000 people worldwide.
Porphyrias are rare disorders that affect mainly the skin or nervous system and may cause abdominal pain. These disorders are usually inherited, meaning they are caused by abnormalities in genes passed from parents to children. When a person has a porphyria, cells fail to change body chemicals called porphyrins and porphyrin precursors into heme, the substance that gives blood its red color. The body makes heme mainly in the bone marrow and liver. Bone marrow is the soft, spongelike tissue inside the bones; it makes stem cells that develop into one of the three types of blood cellsred blood cells, white blood cells, and platelets. The process of making heme is called the heme biosynthetic pathway. One of eight enzymes controls each step of the process. The body has a problem making heme if any one of the enzymes is at a low level, also called a deficiency. Porphyrins and porphyrin precursors of heme then build up in the body and cause illness.
Pilomatricoma is an uncommon tumor. The exact prevalence is unknown, but pilomatricoma probably accounts for less than 1 percent of all benign skin tumors.
Laron syndrome is a condition that occurs when the body is unable to utilize growth hormone. It is primarily characterized by short stature. Other signs and symptoms vary but may include reduced muscle strength and endurance; hypoglycemia in infancy; delayed puberty; short limbs (arms and legs); and obesity. It is often caused by changes (mutations) in the GHR gene and is inherited in an autosomal recessive manner. Treatment is focused on improving growth and generally includes injections of insulin-like growth factor 1 (IGF-1).
How is glucose transporter type 1 deficiency syndrome diagnosed? A diagnosis of glucose transporter type 1 deficiency syndrome (GLUT1 deficiency syndrome) is often suspected based on the presence of characteristic signs and symptoms. Additional testing can then be ordered to confirm the diagnosis. This may include a lumbar puncture, specialized blood tests to measure the blood concentration of glucose and genetic testing.
The main symptoms of PSC are itching, fatigue, and yellowing of the skin or whites of the eyes. An infection in the bile ducts can cause chills and fever. PSC progresses slowly, so a person can have the disease for years before symptoms develop.
Colorectal cancer accounts for almost ten percent of all cancer deaths in the United States. The risk of developing colorectal cancer rises after age 50. It is common in both men and women.
Intervertebral disc disease (IDD) is a common musculoskeletal condition that primarily affects the back. It is characterized by intervertebral disc herniation and/or sciatic pain (sciatica) and is a primary cause of low back pain, affecting about 5% of individuals. Both environmental and genetic factors are thought to predispose an individual to developing the condition. Treatment for IDD may include physical therapy, pain medications, and sometimes surgical intervention such as discectomy or spinal fusion.
No. Most heart attack patients do not have all of the symptoms. The important thing to remember is that if you have any of the symptoms and they grow more intense, and last more than 5 minutes, you should call 9-1-1 immediately.
This condition is considered to have an autosomal dominant pattern of inheritance, which means one copy of the altered gene in each cell is sufficient to cause the disorder. Most cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
- Goodpasture syndrome is a pulmonary-renal syndrome, which is a group of acute illnesses involving the kidneys and lungs. Goodpasture syndrome includes all of the following conditions: - glomerulonephritis - the presence of anti-glomerular basement membrane (GBM) antibodies - bleeding in the lungs - Goodpasture syndrome is fatal unless quickly diagnosed and treated. - People who smoke or use hair dyes appear to be at increased risk for this condition. Exposure to hydrocarbon fumes, metallic dust, and certain drugs may also raise a persons risk. - The symptoms of Goodpasture syndrome may initially include fatigue, nausea, vomiting, and weakness. The lungs are usually affected before or at the same time as the kidneys, and symptoms can include shortness of breath and coughing, sometimes with blood. Symptoms that occur when the kidneys are affected include blood in the urine or foamy urine, swelling in the legs, and high blood pressure. - A urinalysis, blood test, chest x ray, and kidney biopsy are used to diagnose Goodpasture syndrome. - Goodpasture syndrome is usually treated with immunosuppressive medications, corticosteroid medications, and plasmapheresis.
Congenital afibrinogenemia 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. The parents have about half the normal level of fibrinogen in their blood but typically do not show signs and symptoms of the condition.
Beriberi is a condition that occurs in people who are deficient in thiamine (vitamin B1). There are two major types of beriberi: wet beriberi which affects the cardiovascular system and dry beriberi which affects the nervous system. People with wet beriberi may experience increased heart rate, shortness of breath, and swelling of the lower legs. Signs and symptoms of dry beriberi include difficulty walking; loss of feeling in the hands and/or feet; paralysis of the lower legs; mental confusion; speech difficulty; pain; and/or vomiting. Beriberi is rare in the United States since many foods are now vitamin enriched; however, alcohol abuse, dialysis and taking high doses of diuretics increases the risk of developing the condition. In most cases, beriberi occurs sporadically in people with no family history of the condition. A rare condition known as genetic beriberi is inherited (passed down through families) and is associated with an inability to absorb thiamine from foods. Treatment generally includes thiamine supplementation, given by injection or taken by mouth.
Treatment for individuals with Dandy-Walker Syndrome generally consists of treating the associated problems, if needed. A surgical procedure called a shunt may be required to drain off excess fluid within the brain, which will reduce pressure inside the skull and improve symptoms. Treatment may also include various forms of therapy (physicial, occupational) and specialized education.
About 20 cases of Troyer syndrome have been reported in the Old Order Amish population of Ohio. It has not been found outside this population.
More than 100 people have been diagnosed with ARCA1. This condition was first discovered in individuals from the Beauce and Bas-Saint-Laurent regions of Quebec, Canada, but it has since been found in populations worldwide.
These resources address the diagnosis or management of XLP: - Children's Hospital of Philadelphia - Gene Review: Gene Review: Lymphoproliferative Disease, X-Linked - Genetic Testing Registry: Lymphoproliferative syndrome 1, X-linked - Genetic Testing Registry: Lymphoproliferative syndrome 2, X-linked - MedlinePlus Encyclopedia: Epstein-Barr Virus Test - Merck Manual for Healthcare Professionals - XLP Research Trust: Immunoglobulin Replacement - XLP Research Trust: Preparing for Bone Marrow Transplant 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
Diabetes means your blood glucose, or blood sugar, levels are too high. With type 2 diabetes, the more common type, your body does not make or use insulin well. Insulin is a hormone that helps glucose get into your cells to give them energy. Without insulin, too much glucose stays in your blood. Over time, high blood glucose can lead to serious problems with your heart, eyes, kidneys, nerves, and gums and teeth. You have a higher risk of type 2 diabetes if you are older, obese, have a family history of diabetes, or do not exercise. Having prediabetes also increases your risk. Prediabetes means that your blood sugar is higher than normal but not high enough to be called diabetes. The symptoms of type 2 diabetes appear slowly. Some people do not notice symptoms at all. The symptoms can include - Being very thirsty - Urinating often - Feeling very hungry or tired - Losing weight without trying - Having sores that heal slowly - Having blurry eyesight Blood tests can show if you have diabetes. One type of test, the A1C, can also check on how you are managing your diabetes. Many people can manage their diabetes through healthy eating, physical activity, and blood glucose testing. Some people also need to take diabetes medicines. NIH: National Institute of Diabetes and Digestive and Kidney Diseases
OFCD syndrome is very rare; the incidence is estimated to be less than 1 in 1 million people.
These resources address the diagnosis or management of mucopolysaccharidosis type VI: - Emory University Lysosomal Storage Disease Center - Genetic Testing Registry: Mucopolysaccharidosis type VI - MedlinePlus Encyclopedia: Mucopolysaccharides - National Institute of Neurological Disorders and Stroke: Mucopolysaccharidoses Fact Sheet - National MPS Society: Treatments 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
AEC syndrome is a rare condition; its prevalence is unknown. All forms of ectodermal dysplasia together occur in about 1 in 100,000 newborns in the United States.
Summary : You've probably seen your chart at your doctor's office. In fact, you may have charts at several doctors' offices. If you've been in the hospital, you have a chart there, too. These charts are your medical records. They may be on paper or electronic. To keep track of all this information, it's a good idea to keep your own personal health record. What kind of information would you put in a personal health record? You could start with - Your name, birth date, blood type, and emergency contact information - Date of last physical - Dates and results of tests and screenings - Major illnesses and surgeries, with dates - A list of your medicines and supplements, the dosages, and how long you've taken them - Any allergies - Any chronic diseases - Any history of illnesses in your family
Having trouble swallowing (dysphagia) is a symptom that accompanies a number of neurological disorders. The problem can occur at any stage of the normal swallowing process as food and liquid move from the mouth, down the back of the throat, through the esophagus and into the stomach. Difficulties can range from a total inability to swallow, to coughing or choking because the food or liquid is entering the windpipe, which is referred to as aspiration. When aspiration is frequent a person can be at risk of developing pneumonia. Food may get "stuck" in the throat or individuals may drool because they cannot swallow their saliva. Neurological conditions that can cause swallowing difficulties are: stroke (the most common cause of dysphagia); traumatic brain injury; cerebral palsy; Parkinson disease and other degenerative neurological disorders such as amyotrophic lateral sclerosis (ALS, also known as Lou Gehrig's disease), multiple sclerosis, progressive supranuclear palsy, Huntington disease, and myasthenia gravis. Muscular dystrophy and myotonic dystrophy are accompanied by dysphagia, which is also the cardinal symptom of oculopharyngeal muscular dystrophy, a rare, progressive genetic disorder.
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.
Biliary atresia likely has multiple causes, though none are yet proven. Biliary atresia is not an inherited disease, meaning it does not pass from parent to child. Therefore, survivors of biliary atresia are not at risk for passing the disorder to their children. Biliary atresia is most likely caused by an event in the womb or around the time of birth. Possible triggers of the event may include one or more of the following: - a viral or bacterial infection after birth, such as cytomegalovirus, reovirus, or rotavirus - an immune system problem, such as when the immune system attacks the liver or bile ducts for unknown reasons - a genetic mutation, which is a permanent change in a genes structure - a problem during liver and bile duct development in the womb - exposure to toxic substances
Tetra-amelia syndrome is a very rare disorder characterized by the absence of all four limbs. ("Tetra" is the Greek word for "four," and "amelia" refers to the failure of an arm or leg to develop before birth.) This syndrome can also cause severe malformations of other parts of the body, including the face and head, heart, nervous system, skeleton, and genitalia. The lungs are underdeveloped in many cases, which makes breathing difficult or impossible. Because children with tetra-amelia syndrome have such serious medical problems, most are stillborn or die shortly after birth.
Tinnitus is often described as a ringing in the ears. It also can sound like roaring, clicking, hissing, or buzzing. It may be soft or loud, high pitched or low pitched. You might hear it in either one or both ears. Millions of Americans have tinnitus. People with severe tinnitus may have trouble hearing, working or even sleeping. Causes of tinnitus include - Hearing loss in older people - Exposure to loud noises - Ear and sinus infections - Heart or blood vessel problems - Meniere's disease - Brain tumors - Hormonal changes in women - Thyroid problems - Certain medicines Treatment depends on the cause. Treatments may include hearing aids, sound-masking devices, medicines, and ways to learn how to cope with the noise. NIH: National Institute on Deafness and Other Communication Disorders
This condition is inherited in an autosomal dominant pattern, which means one copy of an altered KRT12 or KRT3 gene in each cell is sufficient to cause the disorder. In most cases, an affected person inherits the condition from an affected parent.
These resources address the diagnosis or management of complete LCAT deficiency: - Genetic Testing Registry: Norum disease - MedlinePlus Encyclopedia: Corneal Transplant - National Heart, Lung, and Blood Institute: How is Hemolytic Anemia Treated? - National Institutes of Diabetes and Digestive and Kidney Diseases: Kidney Failure -- Choosing a Treatment That's Right for You - Oregon Health and Science University: Corneal Dystrophy 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
EKVP can be caused by mutations in the GJB3 or GJB4 gene. These genes provide instructions for making proteins called connexin 31 and connexin 30.3, respectively. These proteins are part of the connexin family, a group of proteins that form channels called gap junctions on the surface of cells. Gap junctions open and close to regulate the flow of nutrients, charged atoms (ions), and other signaling molecules from one cell to another. They are essential for direct communication between neighboring cells. Gap junctions formed with connexin 31 and connexin 30.3 are found in several tissues, including the outermost layer of skin (the epidermis). The GJB3 and GJB4 gene mutations that cause EKVP alter the structure of the connexins produced from these genes. Studies suggest that the abnormal proteins can build up in a cell structure called the endoplasmic reticulum (ER), triggering a harmful process known as ER stress. Researchers suspect that ER stress damages and leads to the premature death of cells in the epidermis. This cell death leads to skin inflammation, which appears to underlie the development of erythematous areas. The mechanism by which epidermal damage and cell death contributes to hyperkeratosis is poorly understood. In some cases, affected individuals have no identified mutation in the GJB3 or GJB4 gene. In these individuals, the cause of the disorder is unknown. Researchers suspect that changes in other, unidentified genes may also be associated with EKVP.
Schimke immunoosseous dysplasia (SIOD) is a condition characterized by short stature, kidney disease, and a weakened immune system. Growth failure is often the first sign of this condition. Other features are usually detected in the evaluation for growth failure or in the following years. The severity of SIOD ranges from an infantile or severe early-onset form to a juvenile or milder late-onset form. Complications of the severe form of SIOD can include strokes, severe opportunistic infections, bone marrow failure, and kidney failure that can be life-threatening early in life. People with milder disease have survived to adulthood if their kidney disease is managed. This condition is inherited in an autosomal recessive pattern. Mutations in the SMARCAL1 gene increase the risk to develop Schimke immunoosseous dysplasia. However, in order for people with SMARCAL1 gene mutations to develop symptoms of Schimke immunoosseous dysplasia, other currently unknown genetic or environmental factors must also be present.
Mutations in the ACAD8 gene cause IBD deficiency. This gene provides instructions for making the IBD enzyme, which is involved in breaking down valine. ACAD8 gene mutations reduce or eliminate the activity of the IBD enzyme. As a result, valine is not broken down properly. Impaired processing of valine may lead to reduced energy production and the features of IBD deficiency.
These resources address the diagnosis or management of Bloom syndrome: - Gene Review: Gene Review: Bloom's Syndrome - Genetic Testing Registry: Bloom syndrome - MedlinePlus Encyclopedia: Short Stature 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 : Asbestos is the name of a group of minerals with long, thin fibers. It was once used widely as insulation. It also occurs in the environment. Asbestos fibers are so small you can't see them. If you disturb asbestos, the fibers can float in the air. This makes them easy to inhale, and some may become lodged in the lungs. If you breathe in high levels of asbestos over a long period of time, the fibers can build up in the lungs. This causes scarring and inflammation, and can affect breathing. Eventually it can lead to diseases such as - Asbestosis, or scarring of the lungs that makes it hard to breathe - Mesothelioma, a rare cancer that affects the lining of the lungs or abdomen - Lung cancer Lung diseases associated with asbestos usually develop over many years. People who become ill from asbestos are usually exposed on the job over long periods of time. Smoking cigarettes increases the risk. Agency for Toxic Substances and Disease Registry
These resources address the diagnosis or management of ankylosing spondylitis: - Genetic Testing Registry: Ankylosing spondylitis - MedlinePlus Encyclopedia: Ankylosing Spondylitis - MedlinePlus Encyclopedia: HLA-B27 Antigen 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
Huntington's disease (HD) is an inherited disease that causes certain nerve cells in the brain to waste away. People are born with the defective gene, but symptoms usually don't appear until middle age. Early symptoms of HD may include uncontrolled movements, clumsiness, and balance problems. Later, HD can take away the ability to walk, talk, and swallow. Some people stop recognizing family members. Others are aware of their environment and are able to express emotions. If one of your parents has Huntington's disease, you have a 50 percent chance of getting it. A blood test can tell you if have the HD gene and will develop the disease. Genetic counseling can help you weigh the risks and benefits of taking the test. There is no cure. Medicines can help manage some of the symptoms, but cannot slow down or stop the disease. NIH: National Institute of Neurological Disorders and Stroke
Women who have a family history of ovarian cancer are at an increased risk of ovarian 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. Women who have one first-degree relative (mother, daughter, or sister) with a history of ovarian cancer have an increased risk of ovarian cancer. This risk is higher in women who have one first-degree relative and one second-degree relative (grandmother or aunt) with a history of ovarian cancer. This risk is even higher in women who have two or more first-degree relatives with a history of ovarian cancer.
How is Book syndrome diagnosed? Due to the rarity of Book syndrome and scarcity of reports in the medical literature, we are unaware of specific information about diagnosing Book syndrome. In general, ectodermal dysplasias are diagnosed by the presence of specific symptoms affecting the hair, nails, sweat glands, and/or teeth. When a person has at least two types of abnormal ectodermal features (e.g., malformed teeth and extremely sparse hair), the person is typically identified as being affected by an ectodermal dysplasia. Specific genetics tests to diagnose ectodermal dysplasia are available for only a limited number of ectodermal dysplasias. Unfortunately, there currently is no genetic test for Book syndrome because the gene responsible for the condition has not yet been identified. People who are interested in learning more about a diagnosis of ectodermal dysplasia for themselves or family members should speak with their dermatologist and/or dentist. These specialists can help determine whether a person has signs and/or symptoms of ectodermal dysplasia.
If you have osteoporosis, ask your doctor which activities are safe for you. If you have low bone mass, experts recommend that you protect your spine by avoiding exercises or activities that flex, bend, or twist it. Furthermore, you should avoid high-impact exercise to lower the risk of breaking a bone. You also might want to consult with an exercise specialist to learn the proper progression of activity, how to stretch and strengthen muscles safely, and how to correct poor posture habits. An exercise specialist should have a degree in exercise physiology, physical education, physical therapy, or a similar specialty. Be sure to ask if he or she is familiar with the special needs of people with osteoporosis. If you have health problemssuch as heart trouble, high blood pressure, diabetes, or obesityor if you aren't used to energetic activity, check with your doctor before you begin a regular exercise program.
These resources address the diagnosis or management of essential thrombocythemia: - Cleveland Clinic: Thrombocytosis - Genetic Testing Registry: Essential thrombocythemia - Merck Manual for Health Care Professionals: Essential Thrombocythemia 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
Pseudopelade of Brocq (PBB) is a slowly progressive, chronic condition characterized by scarring hair loss (cicatricial alopecia). There exists some controversy as to whether PBB is a distinct condition or the common final stage or variant of several different forms of scarring alopecias such as discoid lupus erythematosus (DLE) or lichen planopilaris (LPP). Some have suggested abandoning the use of the term pseudopelade of Brocq while others think that the term should be strictly used to describe patients that follow the pattern of hair loss described by Brocq et al.(i.e., multiple, small, discrete, asymmetrical, smooth, soft, flesh-colored or white patches of hair loss with little, if any, inflammation). Although the exact cause of PBB has not been identified, it is believed to be an autoimmune disease. Some individuals with PBB have been found to have Borrelia burgdorferi, the bacterium that causes Lyme disease. Neither an effective treatment nor cure is currently available.
Neurofibromatosis type 2 is considered to have an autosomal dominant pattern of inheritance. People with this condition are born with one mutated copy of the NF2 gene in each cell. In about half of cases, the altered gene is inherited from an affected parent. The remaining cases result from new mutations in the NF2 gene and occur in people with no history of the disorder in their family. Unlike most other autosomal dominant conditions, in which one altered copy of a gene in each cell is sufficient to cause the disorder, two copies of the NF2 gene must be altered to trigger tumor formation in neurofibromatosis type 2. A mutation in the second copy of the NF2 gene occurs in Schwann cells or other cells in the nervous system during a person's lifetime. Almost everyone who is born with one NF2 mutation acquires a second mutation (known as a somatic mutation) in these cells and develops the tumors characteristic of neurofibromatosis type 2.
What are the signs and symptoms of Congenital mirror movement disorder? The Human Phenotype Ontology provides the following list of signs and symptoms for Congenital mirror movement disorder. 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) Incomplete penetrance 50% Autosomal dominant inheritance - Bimanual synkinesia - 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.
Myotonic dystrophy affects at least 1 in 8,000 people worldwide. The prevalence of the two types of myotonic dystrophy varies among different geographic and ethnic populations. In most populations, type 1 appears to be more common than type 2. However, recent studies suggest that type 2 may be as common as type 1 among people in Germany and Finland.
How is Robinow syndrome inherited? Robinow syndrome may be inherited in an autosomal recessive or autosomal dominant manner. Autosomal recessive (AR) inheritance means both copies of the responsible gene in each cell must have a mutation for a person to be affected. The parents of a person with AR Robinow syndrome usually each carry one mutated copy of the gene and are referred to as carriers. Carriers typically are unaffected. When two carriers of AR Robinow syndrome have children together, each child has a 25% (1 in 4) chance to be affected, a 50% (1 in 2) chance to be an unaffected carrier like each parent, and a 25% chance to be unaffected and not a carrier. Autosomal dominant (AD) inheritance means that having only one mutated copy of the responsible gene in each cell is enough to cause features of the condition. Some people with AD Robinow syndrome inherit the mutated gene from an affected parent. In other cases, the mutation that causes the condition occurs for the first time in the affected person. When a person with AD Robinow syndrome has children, each child has a 50% chance to inherit the mutated gene.
How is congenital laryngeal paralysis diagnosed? The following online resources provide information on the diagnosis of congenital laryngeal paralysis: National Institute on Deafness and Other Communication Disorders- Vocal Fold Paralysis American Speech-Language-Hearing Association (ASHA) - Vocal Cord Paralysis Medscape Reference - Congenital Malformations of the Larynx
These resources address the diagnosis or management of DRPLA: - Gene Review: Gene Review: DRPLA - Genetic Testing Registry: Dentatorubral pallidoluysian atrophy - MedlinePlus Encyclopedia: Dementia - MedlinePlus Encyclopedia: Epilepsy 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 : Our environment affects our health. If parts of the environment, like the air, water, or soil become polluted, it can lead to health problems. For example, asthma pollutants and chemicals in the air or in the home can trigger asthma attacks. Some environmental risks are a part of the natural world, like radon in the soil. Others are the result of human activities, like lead poisoning from paint, or exposure to asbestos or mercury from mining or industrial use. NIH: National Institute of Environmental Health Sciences
Oculocutaneous albinism can result from mutations in several genes, including TYR, OCA2, TYRP1, and SLC45A2. Changes in the TYR gene cause type 1; mutations in the OCA2 gene are responsible for type 2; TYRP1 mutations cause type 3; and changes in the SLC45A2 gene result in type 4. Mutations in additional genes likely underlie the other forms of this disorder. The genes associated with oculocutaneous albinism are involved in producing a pigment called melanin, which is the substance that gives skin, hair, and eyes their color. In the retina, melanin also plays a role in normal vision. Mutations in any of these genes disrupt the ability of cells to make melanin, which reduces pigmentation in the skin, hair, and eyes. A lack of melanin in the retina leads to the vision problems characteristic of oculocutaneous albinism. Alterations in the MC1R gene can change the appearance of people with oculocutaneous albinism type 2. This gene helps regulate melanin production and is responsible for some normal variation in pigmentation. People with genetic changes in both the OCA2 and MC1R genes have many of the usual features of oculocutaneous albinism type 2, including light-colored eyes and vision problems; however, they typically have red hair instead of the usual yellow, blond, or light brown hair seen with this condition. Some individuals with oculocutaneous albinism do not have mutations in any of the known genes. In these people, the genetic cause of the condition is unknown.
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. A few cases result from new mutations in the KCNQ2 gene. These cases occur in people with no history of benign familial neonatal seizures in their family.
Kimura disease is a rare, benign, chronic disorder that causes inflammation of tissue (nodules) under the skin of the head or neck. These nodules tend to recur despite treatment. The cause of this condition is unknown, but may be due to an immune response.
Acquired cystic kidney disease happens when a person's kidneys develop fluid-filled sacs, called cysts, over time. Acquired cystic kidney disease is not the same as polycystic kidney disease (PKD), another disease that causes the kidneys to develop multiple cysts. Acquired cystic kidney disease occurs in children and adults who have - chronic kidney disease (CKD)a condition that develops over many years and may lead to end-stage kidney disease, or ESRD. The kidneys of people with CKD gradually lose their ability to filter wastes, extra salt, and fluid from the blood properly. - end-stage kidney diseasetotal and permanent kidney failure that requires a kidney transplant or blood-filtering treatments called dialysis. The cysts are more likely to develop in people who are on kidney dialysis. The chance of developing acquired cystic kidney disease increases with the number of years a person is on dialysis. However, the cysts are caused by CKD or kidney failure, not dialysis treatments. More information is provided in the NIDDK health topics, kidney failureand dialysis.
How is familial hypertrophic cardiomyopathy inherited? Familial hypertrophic cardiomyopathy (HCM) is inherited in an autosomal dominant manner. This means that having only one changed (mutated) copy of the responsible gene in each cell is enough to cause features of the condition. When a person with an autosomal dominant condition has children, each child has a 50% (1 in 2) chance to inherit the mutated copy of the gene. In rare cases, a person with familial HCM has a mutation in both copies of the responsible gene, which leads to more severe signs and symptoms.
Scientists have done research on chemoprevention -- the use of drugs to prevent cancer from developing in the first place. Most of these studies have looked at people with high risk for the disease (where it runs in families) and not in the general population. For example, researchers have found that anti-inflammatory drugs helped keep intestinal tumors from forming, but serious side effects have been noted so researchers are proceeding cautiously. Studies have shown that non-steroidal anti-inflammatory drugs can keep large bowel polyps from forming. Bowel polyps can start out benign, or non-cancerous, but can become cancerous. Serious cardiac effects of these drugs have been noted so researchers are also proceeding cautiously in recommending these drugs for prevention.
Centronuclear myopathy is a rare condition; its exact prevalence is unknown.
Klebsiella infections refer to several different types of healthcare-associated infections that are all caused by the Klebsiella bacteria, including pneumonia; bloodstream infections; wound or surgical site infections; and meningitis. Healthy people usually do not get Klebsiella infections. However, people who are hospitalized and receiving treatment for other conditions may be susceptible to these infections. In healthcare settings, people who require long courses of antibiotics and/or devices such as ventilators (breathing machines) or intravenous (vein) catheters are at the most risk for Klebsiella infections. These infections are often treated with antibiotics, although some Klebsiella bacteria may be resistant to certain types of antibiotics.
These resources address the diagnosis or management of juvenile primary osteoporosis: - Lucile Packard Children's Hospital at Stanford: Juvenile Osteoporosis - MedlinePlus Encyclopedia: Bone Mineral Density Test - Merck Manual Home Health Edition: Osteoporosis 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 : Mastering new skills such as how to walk, talk, and use the potty are developmental milestones. It is exciting to watch your toddler learn new skills. The normal development of children aged 1-3 can be broken down into the following areas: - Gross motor - walking, running, climbing - Fine motor - feeding themselves, drawing - Sensory - seeing, hearing, tasting, touching, and smelling - Language - saying single words, then sentences - Social - playing with others, taking turns, doing fantasy play Toddlers do not develop at the same rate. There is a wide range of what is considered "normal." Your child may be ahead in some areas and slightly behind in others. If you are worried about possible delays, talk to your child's health care provider.
Most cases of oculodentodigital dysplasia are inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In some 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. Less commonly, oculodentodigital dysplasia can be 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. Fewer than ten cases of autosomal recessive oculodentodigital dysplasia have been reported.
These resources address the diagnosis or management of Shwachman-Diamond syndrome: - Gene Review: Gene Review: Shwachman-Diamond Syndrome - Genetic Testing Registry: Shwachman syndrome - MedlinePlus Encyclopedia: Malabsorption 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
A person with dual diagnosis has both a mental disorder and an alcohol or drug problem. These conditions occur together frequently. In particular, alcohol and drug problems tend to occur with - Depression - Anxiety disorders - Schizophrenia - Personality disorders Sometimes the mental problem occurs first. This can lead people to use alcohol or drugs that make them feel better temporarily. Sometimes the substance abuse occurs first. Over time, that can lead to emotional and mental problems. Someone with a dual diagnosis must treat both conditions. For the treatment to be effective, the person needs to stop using alcohol or drugs. Treatments may include behavioral therapy, medicines, and support groups. NIH: National Institute on Drug Abuse
Mutations in the ADGRV1, CDH23, CLRN1, MYO7A, PCDH15, USH1C, USH1G, and USH2A genes can cause Usher syndrome. The genes related to Usher syndrome provide instructions for making proteins that play important roles in normal hearing, balance, and vision. They function in the development and maintenance of hair cells, which are sensory cells in the inner ear that help transmit sound and motion signals to the brain. In the retina, these genes are also involved in determining the structure and function of light-sensing cells called rods and cones. In some cases, the exact role of these genes in hearing and vision is unknown. Most of the mutations responsible for Usher syndrome lead to a loss of hair cells in the inner ear and a gradual loss of rods and cones in the retina. Degeneration of these sensory cells causes hearing loss, balance problems, and vision loss characteristic of this condition. Usher syndrome type I can result from mutations in the CDH23, MYO7A, PCDH15, USH1C, or USH1G gene. At least two other unidentified genes also cause this form of Usher syndrome. Usher syndrome type II is caused by mutations in at least four genes. Only two of these genes, ADGRV1 and USH2A, have been identified. Mutations in at least two genes are responsible for Usher syndrome type III; however, CLRN1 is the only gene that has been identified.
Is Moebius syndrome inherited? Most cases of Moebius syndrome are not inherited and occur as isolated cases in individuals with no history of the condition in their family (sporadically). A small percentage of cases of Moebius syndrome have been familial (occurring in more than one individual in a family), but there has not been a consistent pattern of inheritance among all affected families. In some families the pattern has been suggestive of autosomal dominant inheritance, while in other families it has been suggestive of autosomal recessive or X-linked recessive inheritance.
Collectively, all forms of NCL affect an estimated 1 in 100,000 individuals worldwide. NCLs are more common in Finland, where approximately 1 in 12,500 individuals have the condition. Kufs disease is thought to represent 1.3 to 10 percent of all NCLs.
Not all headaches require medical attention. But some types of headache are signals of more serious disorders and call for prompt medical care. These include: sudden, severe headache or sudden headache associated with a stiff neck; headaches associated with fever, convulsions, or accompanied by confusion or loss of consciousness; headaches following a blow to the head, or associated with pain in the eye or ear; persistent headache in a person who was previously headache free; and recurring headache in children. Migraine headaches may last a day or more and can strike as often as several times a week or as rarely as once every few years.