Heinstra P W, Scharloo W, Thörig G E
Department of Population and Evolutionary Biology, University of Utrecht, The Netherlands.
Genetics. 1987 Sep;117(1):75-84. doi: 10.1093/genetics/117.1.75.
This study deals with biochemical and metabolic-physiological aspects of the relationship between variation in in vivo alcohol dehydrogenase activity and fitness in larvae homozygous for the alleles Adh71k, AdhF, AdhS, of Drosophila melanogaster, and for the common Adh allele of Drosophila simulans. The Adh genotypes differ in the maximum oxidation rates of propan-2-ol into acetone in vivo. There are smaller differences between the Adh genotypes in rates of ethanol elimination. Rates of accumulation of ethanol in vivo are negatively associated with larval-to-adult survival of the Adh genotypes. The rank order of the maximum rates of the ADHs in elimination of propan-2-ol, as well as ethanol, is ADH-71k greater than ADH-F greater than ADH-S greater than simulans-ADH. The ratio of this maximum rate to ADH quantity reveals the rank order of ADH-S greater than ADH-F greater than ADH-71k greater than simulans-ADH, suggesting a compensation for allozymic efficiency by the ADH quantity in D. melanogaster. Our findings show that natural selection may act on the Adh polymorphism in larvae via differences in rates of alcohol metabolism.
本研究探讨了黑腹果蝇等位基因Adh71k、AdhF、AdhS纯合幼虫以及拟果蝇常见Adh等位基因的体内乙醇脱氢酶活性变化与适应性之间关系的生化和代谢生理方面。Adh基因型在体内将丙-2-醇氧化为丙酮的最大氧化速率上存在差异。Adh基因型在乙醇消除速率上的差异较小。体内乙醇积累速率与Adh基因型的幼虫到成虫存活率呈负相关。ADH在消除丙-2-醇以及乙醇方面的最大速率排序为:ADH-71k大于ADH-F大于ADH-S大于拟果蝇-ADH。该最大速率与ADH量的比值显示出ADH-S大于ADH-F大于ADH-71k大于拟果蝇-ADH的排序,这表明黑腹果蝇中ADH量对同工酶效率具有补偿作用。我们的研究结果表明,自然选择可能通过酒精代谢速率的差异作用于幼虫的Adh多态性。