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Lactate dehydrogenase isozymes in the genus xenopus species specific patterns


, : Lactate dehydrogenase isozymes in the genus xenopus species specific patterns. Journal of Experimental Zoology 211(3): 281-290

The LDH [lactate dehydrogenase] isozymes of 13 spp. and subspecies of the genus Xenopus [including X. laevis laevis, X. laevis petersi, X. laevis victorianus, X. laevis brinyoniensis, X. clivii, X. muelleri, X. borealis, X. fraseri, X. tropicalis, X. vestitus, X. wittei and X. ruwenzoriensis] were analyzed electrophoretically. In 7 spp. and subspecies, 5 isoenzymes were found as in most vertebrates. The remaining species display more than 5 bands. The gene which codes for the A subunit shows little variability. With 1 exception (X. fraseri), all species with 36 chromosomes and X. tropicalis with 20 chromosomes possess the same A gene or at least a gene product with the same mobility. In contrast to this, the gene which codes for the B subunit differs in all but 1 case, thus producing species-specific isozyme patterns. An allelic polymorphism at the LDH-B locus in an X. laevis subspecies was found. In heterozygotes, the expected 15 isoenzymes can clearly be visualized. Since X. laevis can be considered as being tetraploid in respect to X. tropicalis, the occurrence of 3 genotypes in the offspring of a single pair mating gives evidence that 1 LDH-B locus was rendered silent during evolution.

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