Specific features of expression of aspartate aminotransferase genes in early development of some cyprinid fishes and their intergeneric F1 hybrids

Abstract

Temporal parameters of expression of the aspartate aminotransferase gene Aat-1 parental alleles were studied in early development of intergeneric reciprocal F1 hybrids of the bream, roach, and blue bream. When the first AaT-1 expression was timed to the early stages (late blastula-gastrula), the gene parental alleles were activated asynchronously according to the maternal types (blue bream x roach hybrids). When the first Aat-1 expression was timed to later stages (yolk sac resorption), the parental alleles were activated synchronously (bream x roach, roach x bream, and roach x blue bream hybrids). The pattern of activation of embryonic genes is determined by the maternal environment and the influence of allele interactions is not excluded: Aat-f/Aat-sl (bream x roach, roach x bream, and roach x blue bream) and Aat-sl/Aat-med (blue bream x roach).