サケとニジマスのリンゴ酸脱水素酵素に関与する重複遺伝子と変異〔英文〕

概要

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Supernatant malate dehydrogenase (S-MDH) isozymes of chum salmon and rainbow trout were examined by starch gel electrophoresis. Three types of B-subunit isozyme patterns were demonstrated for 396 specimens of chum salmon captured in nine rivers, and four types for 420 of rainbow trout from six hatcheries. On the bases of the occurrence of three isozymes at distinctly asymmetrical ratios in heterozygote variants and the frequencies of phenotypes in the populations examined, it was suggested that each of these two species possesses duplicate genetic loci producing dimeric isozymes, which are composed of subunits B' and B in rainbow trout, and B and B" in chum salmon, under the control of corresponding alleles. The gene frequencies of B allele in the rainbow trout populations and the frequency of B" allele in the chum salmon populations were respectively .103 and .056 at most: 65 to 95 percent of rainbow trout exhibited a single isozyme consisting of B' subunit, and more than 82 percent of chum salmon exhibited one consisting of B subunit. The demonstration of duplicate loci for B-subunit isozyme of S-MDH in both species provides additional support for the tetraploidy hypothesis of salmonids.
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