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Deafness, autosomal recessive

Definition:

Hereditary deafness is divided into syndromic forms (in which hearing loss is associated with a variety of other anomalies) and non-syndromic forms. Non-syndromic forms are responsible for 70% of the cases of hereditary etiology and syndromic cases represent 30% of them. Among the forms of heritage, autosomal-recessive inheritance is the most frequent one (75%-85%), followed by autosomal- dominant inheritance (12-13%) and X-linked or mitochondrial, with 2-3% of the cases of non-syndromic hearing loss. The autosomal-recessive forms of deafness are generally the most severe and are almost exclusively caused by cochlear defects (sensorineural deafness), in contrast to the syndromic forms of deafness, where the hearing loss in most cases is conductive (external and/or middle ear developmental defects) or mixed.

References:

Biomedical Dictionary

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