Properties and natural occurrence of maternal-effect selfish genes ('Medea' factors) in the Red Flour Beetle, Tribolium castaneum

被引:41
作者
Beeman, RW
Friesen, KS
机构
[1] USDA ARS, Grain Mkt & Prod Res Ctr, Manhattan, KS 66502 USA
[2] Kansas State Univ, Div Biol, Manhattan, KS 66506 USA
关键词
maternal effect; Medea factor; selfish gene; Tribolium;
D O I
10.1038/sj.hdy.6885150
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Maternally acting selfish genes, termed 'Medea' factors, were found to be widespread in wild populations of Tribolium castaneum collected in Europe, North and South America, Africa and south-east Asia, but were rare or absent in populations from Australia and the Indian subcontinent. We detected at least four distinct genetic loci in at least two different linkage groups that exhibit the Medea pattern of differential mortality of genotypes within maternal families. Although each M factor tested had similar properties of maternal lethality to larvae and zygotic self-rescue, M factors representing distinct loci did not show cross-rescue. Alleles at two of these loci, M-1 and M-4, were by far the most prevalent, M-4 being the predominant type. M-2 and M-3 were each found only once, in Pakistan and Japan, respectively. Although M-1 could be genetically segregated from M-4 and maintained as a purified stock, the M-1 factor invariably co-occurred with M-4 in field populations, whereas M-4 usually occurred in the absence of other Medea factors. The dominant maternal lethal action of M-1 could be selectively inactivated (reverted) by gene-knockout gamma irradiation with retention of zygotic rescue activity.
引用
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页码:529 / 534
页数:6
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