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Myelinated neuron. HNPP is typically caused by autosomal dominant deletion of PMP22 (peripheral myelin protein 22 at locus 17p11.2). [8] PMP22 displays haploinsufficiency, such that the normal copy of the gene's activity is insufficient to compensate for loss of function of the affected copy. [9]
Too much PMP22 (e.g. caused by gene duplication) results in CMT1A, and too little PMP22 (e.g. caused by gene deletion) results in HNPP. [10] Point mutations in PMP22 can result in CMT1E. [ 6 ] Gene duplication of PMP22 is the most common genetic cause of CMT; [ 11 ] [ 12 ] up to half of all cases confirmed by a genetic diagnosis are caused by a ...
Classifications of Charcot–Marie–Tooth disease refers to the types and subtypes of Charcot–Marie–Tooth disease (CMT), a genetically and clinically heterogeneous group of inherited disorders of the peripheral nervous system characterized by progressive loss of muscle tissue and touch sensation across various parts of the body.
Nerve compression syndrome, or compression neuropathy, or nerve entrapment syndrome, is a medical condition caused by chronic, direct pressure on a peripheral nerve. [1] It is known colloquially as a trapped nerve, though this may also refer to nerve root compression (by a herniated disc, for example).
Dejerine–Sottas disease, also known as, Dejerine–Sottas syndrome, [3] hereditary motor and sensory polyneuropathy type III, and Charcot–Marie–Tooth disease type 3, is a hereditary neurological disorder characterized by damage to the peripheral nerves, demyelination, and resulting progressive muscle wasting and somatosensory loss.
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The following is a list of genetic disorders and if known, type of mutation and for the chromosome involved. Although the parlance "disease-causing gene" is common, it is the occurrence of an abnormality in the parents that causes the impairment to develop within the child.
Hereditary nonpolyposis colorectal cancer (HNPCC) is a hereditary predisposition to colon cancer.. HNPCC includes (and was once synonymous with) [1] Lynch syndrome, an autosomal dominant genetic condition that is associated with a high risk of colon cancer, endometrial cancer (second most common), ovary, stomach, small intestine, hepatobiliary tract, upper urinary tract, brain, and skin. [2]
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