Abstract:
:Class III myosins are actin-based motors with amino-terminal kinase domains. Expression of these motors is highly enhanced in retinal photoreceptors. As mutations in the gene encoding NINAC, a Drosophila melanogaster class III myosin, cause retinal degeneration, human homologs of this gene are potential candidates for human retinal disease. We have recently reported the cloning of MYO3A, a human myosin III expressed predominantly in the retina and retinal pigmented epithelium [1]. The map locus of MYO3A is close to, but does not overlap, that of human Usher's 1F [2]. Here we introduce a shorter class III myosin isoform, MYO3B, which is expressed in the retina, kidney, and testis. We describe the cDNA sequence, genomic organization, and splice variants of MYO3B expressed in the human retina. A product of 36 exons, MYO3B has several splice variants containing either one or two calmodulin binding (IQ) motifs in the neck domain and one of three predominant tail variations: a short tail ending just past the second IQ motif, or two alternatively spliced longer tails. MYO3B maps to 2q31.1-q31.2, a region that overlaps the locus for a Bardet-Biedl syndrome (BBS5) linked to markers at 2q31 [3].
journal_name
Genomicsjournal_title
Genomicsauthors
Dosé AC,Burnside Bdoi
10.1006/geno.2002.6749subject
Has Abstractpub_date
2002-05-01 00:00:00pages
621-4issue
5eissn
0888-7543issn
1089-8646pii
S0888754302967492journal_volume
79pub_type
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