EGG-PRODUCTION AND FERTILITY IN DROSOPHILA DEPEND UPON THE NUMBER OF YOLK-PROTEIN GENE COPIES

被引:27
作者
BOWNES, M
LINERUTH, K
MAUCHLINE, D
机构
[1] Department of Molecular Biology, Edinburgh, EH9 3JR, Mayfield Road
来源
MOLECULAR & GENERAL GENETICS | 1991年 / 228卷 / 1-2期
关键词
YOLK PROTEINS; GENE FAMILIES; EVOLUTION; EGG PRODUCTION; DROSOPHILA;
D O I
10.1007/BF00282485
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The yolk proteins of Drosophila melanogaster comprise a family of three related yolk polypeptides each encoded by a single-copy gene. We show by genetic crosses that each gene makes an equivalent contribution to the fecundity and fertility of the female and they do not individually provide unique functions to the embryo. We show that the number of eggs laid by a female depends upon the number of genes encoding yolk polypeptides present in the genome and furthermore that the probability of an egg hatching into an adult also critically depends upon the number of yolk protein genes present in the mother. This suggests that the three yolk protein-encoding genes in Drosophila melanogaster may have arisen by duplication, then been maintained for quantitative reasons because they increased egg production and fertility, rather than each protein evolving a different function as is the case with most small gene families, such as tubulins and collagen genes.
引用
收藏
页码:324 / 327
页数:4
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