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Lactate dehydrogenase ec 1.1.1.27 isozymes of gadiform fishes divergent patterns of gene expression indicate a heterogeneous taxon


, : Lactate dehydrogenase ec 1.1.1.27 isozymes of gadiform fishes divergent patterns of gene expression indicate a heterogeneous taxon. Copeia (3): 563-578

The lactate dehydrogenase (LDH) isozyme patterns of 35 spp. of gadiform fish were analyzed by starch gel electrophoresis and immunochemical procedures. All species exhibited the 3 expected homopolymers of LDH-A4, -B4 and -C4. Although the specific properties (absolute net charge and tissue abundance of each isozyme) of the LDH of each species were unique to that species, certain general features of the LDH patterns characterized most or all species in a given higher taxon (genus, family, suborder). Gadids generally exhibited a highly anodal LDH-A4 homopolymer; ophidiids had one which was nearly isoelectric; macrourids had high levels of LDH-B4 in nearly all tissues; zoarcids only expressed the B4 homopolymer in eye and brain, etc. In contrast to the homogeneity of LDH-C4 expression characteristic of nearly all higher teleost groups, a major dichotomy of LDH-C4 patterns was observed within the Gadiformes. The 19 spp. examined in the suborders Gadoidei and Macrouroidei all possessed a cathodally migrating, liver-predominant C4 isozyme; all 16 spp. examined in the suborders Ophidioidei and Zoarcoidei exhibited a highly anodal, eye-specific LDH-C4. Because each of these forms of LDH-C gene expression represents a derived or specialized state relative to the situation in lower bony fish, and because of the debatable nature of the morphologic evidence originally used to justify the inclusion of these 4 groups in the same order, the order as presently defined probably represents unnatural grouping. The ophidioids and zoarcoids probably should be removed from the Gadiformes.

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