Molecular genetics of sex determination in channel catfish: studies on SRY, ZFY, Bkm, and human telomeric repeats.
In amniotes, the banded krait minor (Bkm) minisatellite (GATA), the human telometric sequence (TTAGGG)7, and the Y-specific genes, ZFY and SRY, are associated with a particular sex. These sequences were studied in the channel catfish, Ictalurus punctatus. However, none was sex-specific in catfish; homologs of each were present in males and females. Our data suggest that components of mammalian sex-determining systems may be widespread and shared among the vertebrates in general. Whether those components are involved in sex determination in lower vertebrates or merely represent evolutionary precursors of sex-determining factors in amniotes remains to be determined.
Tiersch
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Ecological Research Center, Memphis State University, Tennessee 38152.
Simco
B A
BA
Davis
K B
KB
Wachtel
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D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D015139:Blotting, Southern; D004247:DNA / Q000032:analysis* / Q000235:genetics*; D005260:Female; D007059:Ictaluridae / Q000235:genetics*; D008297:Male; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D012732:Sex Determination Analysis; D016615:Telomere / Q000737:chemistry*
D004247:DNA