Linkage relationships among five enzyme-coding gene loci in the copepod Tigriopus californicus: a genetic confirmation of achiasmiatic meiosis.
Linkage relationships among five polymorphic enzyme-coding gene loci in the marine copepod Tigriopus californicus have been determined using electrophoretic analysis of progeny from laboratory matings. Phosphoglucose isomerase (PGI; EC 5.3.1.9) was found to be tightly linked to glutamate-pyruvate transaminase (GPT; EC 2.6..1.2), with only one recombinant observed in 364 progeny; glutamate-oxaloacetate transaminase (GOT; EC 2.6.1.1) is linked to the PGI-GPT pair, with a recombination fraction of approximately 0.20 in male double heterozygotes. Phosphoglucomutase (PGM; EC 2.7.5.1) and an esterase (EST; EC 3.1.1.1) are not linked to the PGI, GPT, GOT grouping, which has been designated linkage group I. Reciprocal crosses have revealed that no recombination occurs in female T. californicus; this observation confirms a previous report that meiosis in female Tigriopus is achiasmatic.
D000410:Alanine Transaminase / Q000235:genetics; D001219:Aspartate Aminotransferases / Q000235:genetics; D003445:Crustacea / Q000235:genetics*; D004950:Esterases / Q000235:genetics; D005260:Female; D008040:Genetic Linkage; D005956:Glucose-6-Phosphate Isomerase / Q000235:genetics; D008297:Male; D008540:Meiosis; D010733:Phosphoglucomutase / Q000235:genetics; D011995:Recombination, Genetic
D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D004950:Esterases; D005956:Glucose-6-Phosphate Isomerase; D010733:Phosphoglucomutase