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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 .
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.
Nonsyndromic deafness is characterized by a partial or total sensorineural hearing loss (SNHL) of variable onset and severity that is not associated with other signs and symptoms. [8] Most forms of nonsyndromic deafness are associated with permanent hearing loss caused by damage to structures in the inner ear.
Hearing loss is a partial or total inability to hear. [5] Hearing loss may be present at birth or acquired at any time afterwards. [6] [7] Hearing loss may occur in one or both ears. [2] In children, hearing problems can affect the ability to acquire spoken language, and in adults it can create difficulties with social interaction and at work. [8]
Mutations in this gene have been associated with progressive postlingual hearing loss, non syndromic deafness [15] and profound prelingual deafness. [7] TMC1 mutations are not associated with other symptoms or abnormalities, which is known as Nonsyndromic hearing loss and indicates that TMC1 functions mainly in auditory sensation. [16]
Transmembrane O-methyltransferase (TOMT) is a protein encoded by the LRTOMT gene in humans. Located on chromosome 11, mutations in LRTOMT are associated with the DFNB63 form of autosomal recessive nonsyndromic hearing loss.
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