Sex linkage in salmonids: evidence from a hybridized genome of brook trout and Arctic charr.
In second-generation sparctics (Salvelinus fontinalis x Salvelinus alpinus) backcrossed to S. fontinalis, we have identified tight classical linkage of phenotypic sex with Ldh-1, Aat-5, and Gpi-3. We designate this locus Sex-1 and suggest that it may be the primary sex-determining locus in salmonids. Cumulative salmonid gene-to-centromere map distances for the three biochemical loci put the order as centromere--Ldh-1--(Aat-5 and Gpi-3), with the latter two loci being tightly linked. An absence of association of phenotypic sex (presumably Sex-1) with these same three loci and other loci known to be linked to these loci is shown in splakes (S. fontinalis x Salvelinus namaycush) and cutbows (Salmo gairdneri x Salmo clarki). These data imply that the linkage of Sex-1 with these loci is found only in S. alpinus and support the view that Sex-1 lies across the centromere from these three loci in S. alpinus, representing a Robertsonian fusion not found in any of the other four species. A similar specific Robertsonian fusion is argued for S. gairdneri, where Sex-1 may be linked across a centromere to another biochemical locus (Ha). These linkage results and chromosomal observations of other investigators suggest that Sex-1 lies on an information-depauperate arm.
May
B
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Cornell Laboraotry for Ecological and Evolutionary Genetics, Department of Natural Resources, Cornell University, Ithaca, New York 14853.
Johnson
K R
KR
Wright
J E
JE
D000818:Animals; D015415:Biomarkers; D002874:Chromosome Mapping; D003434:Crossing Over, Genetic; D005260:Female; D008040:Genetic Linkage; D007527:Isoenzymes / Q000235:genetics*; D008297:Male; D010641:Phenotype; D012487:Salmonidae / Q000235:genetics*; D012732:Sex Determination Analysis; D013045:Species Specificity; D014337:Trout / Q000235:genetics*
D015415:Biomarkers; D007527:Isoenzymes