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Lactate dehydrogenase isozymes of the inbred and outbred individuals of the medaka oryzias latipes


, : Lactate dehydrogenase isozymes of the inbred and outbred individuals of the medaka oryzias latipes. Zoological Science (Tokyo) 3(5): 773-784

Three types of LDH isozymes (type I, II and III) were found in the adult muscle of medaka from a commercial stock. Electrophoretic analyses showed that there were two kinds of subunits (A and A') constituting the most anodally migrating band and that they were present in individuals separately or together. Subunit B which constitutes the most cathodally migrating band was found in common to all individuals. Thus the patterns of type I, II and III are considered to be composed of subunit A and B; A, A' and B; and A' and B, respectively. The type II was the most predominant pattern in the commercial stock. Each of the inbred strains, HO4C and HB12C, is genetically homogeneous and the LDH patterns of type I and type III in principle were found to have been fixed in HO4C and HB12C, respectively. The modes of the subunit expression during development of the reciprocal hybrids between these two strains were identical with each other; the early embryos exhibited only B4 band, while the bands containing A or A' subunits appeared almost simultaneously at the 8th day stage. Thus the LDH patterns of the adult fish of the reciprocal hybrids corresponded to the pattern of type II. No maternal predominancy in the allelic gene expression was observed during development of the intra-specific hybrids of medaka. B subunit of medaka LDH was purified for the first time in the present experiment. The molecular weight was 34,500 and a preliminary sutdy showed that the purified B subunit was able to hybridize with pig H subunit.

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