The cloning and developmental expression of unconventional myosin IXA (MYO9A) a gene in the Bardet-Biedl syndrome (BBS4) region at chromosome 15q22-q23.
Bardet-Biedl Syndrome (BBS) is a heterogeneous, autosomal recessive disorder characterized by mental retardation, obesity, retinitis pigmentosa, syndactyly and/or polydactyly, short stature, and hypogenitalism and is caused by mutations at a number of distinct loci. Using a positional cloning approach for identifying the BBS4 (chromosome 15) gene, we identified and cloned an unconventional myosin gene, myosin IXA (HGMW-approved symbol MYO9A). Since mutations in unconventional myosins are known to cause several human diseases, and since mutations of unconventional myosin VIIa cause retinal degeneration, we evaluated myosin IXA as a candidate for BBS. We exploited PCR-based techniques to clone a 8473-nt cDNA for myosin IXA. A 7644-bp open reading frame predicts a protein with all the hallmarks of class IX unconventional myosins. Human Northern blot analysis and in situ hybridization of mouse embryos reveal that myosin IXA is expressed in many tissues consistent with BBS. Intron/exon boundaries were identified, and myosin IXA DNA and RNA from BBS4 patients were evaluated for mutation.
Gorman
S W
SW
Chiron Corporation, 4560 Horton Street, Emeryville, California 94608, USA.
Haider
N B
NB
Grieshammer
U
U
Swiderski
R E
RE
Kim
E
E
Welch
J W
JW
Searby
C
C
Leng
S
S
Carmi
R
R
Sheffield
V C
VC
Duhl
D M
DM
D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D002884:Chromosomes, Human, Pair 15 / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004252:DNA Mutational Analysis; D004622:Embryo, Mammalian / Q000378:metabolism; D005314:Embryonic and Fetal Development; D005091:Exons; D005260:Female; D018507:Gene Expression Regulation, Developmental; D005796:Genes / Q000235:genetics; D006801:Humans; D017403:In Situ Hybridization; D007438:Introns; D007849:Laurence-Moon Syndrome / Q000235:genetics*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009115:Muridae; D009218:Myosins / Q000235:genetics*; D018807:Polymorphism, Single-Stranded Conformational; D012313:RNA / Q000235:genetics / Q000378:metabolism; D012160:Retina / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014018:Tissue Distribution
C120896:MYO9A protein, human; D012313:RNA; D004247:DNA; D009218:Myosins