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MYO3A Causes Human Dominant Deafness and Interacts with Protocadherin 15‐CD2 Isoform
Author(s) -
Grati M'hamed,
Yan Denise,
Raval Manmeet H.,
Walsh Tom,
Ma Qi,
Chakchouk Imen,
KannanSundhari Abhiraami,
Mittal Rahul,
Masmoudi Saber,
Blanton Susan H.,
Tekin Mustafa,
King MaryClaire,
Yengo Christopher M.,
Liu Xue Zhong
Publication year - 2016
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.22961
Subject(s) - biology , protocadherin , genetics , mutant , stereocilia (inner ear) , microbiology and biotechnology , genetic screen , gene , inner ear , cadherin , hair cell , anatomy , cell
Hereditary hearing loss (HL) is characterized by both allelic and locus genetic heterogeneity. Both recessive and dominant forms of HL may be caused by different mutations in the same deafness gene. In a family with post‐lingual progressive non‐syndromic deafness, whole‐exome sequencing of genomic DNA from five hearing‐impaired relatives revealed a single variant, p.Gly488Glu (rs145970949:G>A) in MYO3A , co‐segregating with HL as an autosomal dominant trait. This amino acid change, predicted to be pathogenic, alters a highly conserved residue in the motor domain of MYO3A. The mutation severely alters the ATPase activity and motility of the protein in vitro, and the mutant protein fails to accumulate in the filopodia tips in COS7 cells. However, the mutant MYO3A was able to reach the tips of organotypic inner ear culture hair cell stereocilia, raising the possibility of a local effect on positioning of the mechanoelectrical transduction (MET) complex at the stereocilia tips. To address this hypothesis, we investigated the interaction of MYO3A with the cytosolic tail of the integral tip‐link protein protocadherin 15 (PCDH15), a core component of MET complex. Interestingly, we uncovered a novel interaction between MYO3A and PCDH15 shedding new light on the function of myosin IIIA at stereocilia tips.