title: Lactate dehydrogenase isozymes and allozymes of the nine-spined stickleback Pungitius pungitius (L.) (Osteichthyes: Gasterosteidae).
abstract: Zymograms indicate the existence of three loci coding for lactate dehydrogenase in the nine-spined stickleback Pungitius pungitius. The skeletal muscle locus is polymorphic for two codominant alleles: Ldh-A(100). and Ldh-A(140). Differences in allele frequencies among nine samples, obtained from eight geographically isolated populations, proved not significant in 28/36 pairwise comparisons. The frequency of Ldh-A(100) varied from 0.426 to 0.715. Significant differences in apparent Km (pyruvate) values were found among the LDH-A allozymes suggesting a functional basis for the selective maintenance of this polymorphism.
mesh_terms: D000483:Alleles; D000818:Animals; D003710:Demography; D005399:Fishes / Q000235:genetics*; D005787:Gene Frequency; D005796:Genes; D005799:Genes, Dominant; D005838:Genotype; D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase / Q000235:genetics*; D009132:Muscles / Q000201:enzymology
chemical_list: D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase