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Nonsyndromic deafness constitutes 75% of all hearing loss cases, and an estimated 100 genes are thought to be linked to this condition. About 80% are linked to autosomal recessive inheritance, 15% to autosomal dominant inheritance, 1-3% through the X chromosome, and 0.5-1% are associated with mitochondrial inheritance .
In X-linked hearing loss, the mother carries the recessive trait for hearing loss on the sex chromosome. She can pass on the trait to male and female children, but usually only male children are affected. There are some genetic syndromes, in which hearing loss is one of the known characteristics.
The most common type of congenital hearing loss in developed countries is DFNB1, also known as connexin 26 deafness or GJB2-related deafness. The most common dominant syndromic forms of hearing loss include Stickler syndrome and Waardenburg syndrome. The most common recessive syndromic forms of hearing loss are Pendred syndrome and Usher syndrome.
Hearing loss is a partial or total inability to ... Around 75–80% of all these cases are inherited by recessive genes, 20–25% are inherited by dominant genes, ...
While deafness can arise at any stage of auditory processing, DFNA36 (a type of progressive hearing loss) and DFNB7/B11 (congenital hearing loss) have been specifically shown to arise from TMC1 mutations. DFNA36 results from a dominant missense mutation and DFNB7/B11 results from a recessive mutation. [5]
Of the genetically related sensorineural hearing loss cases, 75% are autosomal recessive, 15-20% autosomal dominant, and 1-3% sex-linked. While the specific gene and protein is still unknown, mutations in the connexin 26 gene near the DFNB1 locus of chromosome 13 [ 45 ] are thought to account for most of the autosomal recessive genetic-related ...
Non-syndromic hearing loss can occur through multiple pathways including autosomal dominant, autosomal recessive, X-linked, and Y-linked inheritance patterns. [ 15 ] 69 genes and 145 loci have been discovered to be involved in the genetic heterogeneity of non-syndromic hearing loss, and the phenotype of the disorder is largely associated with ...
[7] [8] Autosomal recessive hearing loss is when both parents carry the recessive gene, and pass it on to their child. The autosomal dominant hearing loss is when an abnormal gene from one parent is able to cause hearing loss even though the matching gene from the other parent is normal. [9] This can lead to genetic syndromes, such as Down ...