Abstract:
:Recessive mutations in myosin 15, a class XV unconventional myosin, cause profound congenital deafness in humans and both deafness and vestibular dysfunction in mice homozygous for the shaker 2 and shaker 2(J) alleles. The shaker 2 allele is a previously described missense mutation of a highly conserved residue in the motor domain of myosin XV. The shaker 2(J) lesion, in contrast, is a 14.7 kb deletion that removes the last six exons from the 3"-terminus of the Myo15 transcript. These exons encode a FERM (F, ezrin, radixin and moesin) domain that may interact with integral membrane proteins. Despite the deletion of six exons, Myo15 mRNA transcripts and protein are present in the post-natal day 1 shaker 2(J) inner ear, which suggests that the FERM domain is critical for the development of normal hearing and balance. Myo15 transcripts are first detectable at embryonic day 13.5 in wild-type mice. Myo15 transcripts in the mouse inner ear are restricted to the sensory epithelium of the developing cristae ampularis, macula utriculi and macula sacculi of the vestibular system as well as to the developing organ of Corti. Both the shaker 2 and shaker 2(J) alleles result in abnormally short hair cell stereocilia in the cochlear and vestibular systems. This suggests that Myo15 may be important for both the structure and function of these sensory epithelia.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Anderson DW,Probst FJ,Belyantseva IA,Fridell RA,Beyer L,Martin DM,Wu D,Kachar B,Friedman TB,Raphael Y,Camper SAdoi
10.1093/hmg/9.12.1729subject
Has Abstractpub_date
2000-07-22 00:00:00pages
1729-38issue
12eissn
0964-6906issn
1460-2083journal_volume
9pub_type
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