Fitness effects of X chromosome drive in the stalk‐eyed fly, Cyrtodiopsis dalmanni
Fitness effects of X chromosome drive in the stalk‐eyed fly, Cyrtodiopsis dalmanni
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X染色体驱动对茎眼果蝇Cyrtodiopsis dalmanni的适应性影响
DOI：
10.1111/j.1420-9101.2006.01169.x
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发表时间：
2006
影响因子：
2.1
通讯作者：
A. Lorsong
中科院分区：
文献类型：
--
作者：
G. Wilkinson;P. Johns;E. Kelleher;Mario L. Muscedere;A. Lorsong
性比（SR）男性产生主要是女性后代，因为大多数Y染色体精子是无功能的。由此产生的XSR染色体的传输优势，最终应导致人口灭绝，除非隔离失真被掩盖的抑制或平衡的选择。通过筛选雄性茎眼果蝇，Cyrtodiopsis dalmanni，为育雏性别比，我们发现独特的SR等位基因在三个X连锁微卫星位点，并使用它们来确定SR是否持续作为一个平衡的多态性。我们发现，XSR/XST女性比其他基因型产生更多的后代，SR男性有较低的精子优先，并表现出较低的生育力时，交配8个女性在24小时。 成人存活率与SR基因型无关，但与眼距呈正相关。我们推断，SR多态性很可能是由弱超显性的女性生育力和频率依赖性选择作用于男性生育力的组合。我们在10年内在同一人群中发现了两种SR单倍型，这进一步表明这种SR多态性可能正在迅速演变。
Sex‐ratio (SR) males produce predominantly female progeny because most Y chromosome sperm are rendered nonfunctional. The resulting transmission advantage of XSR chromosomes should eventually cause population extinction unless segregation distortion is masked by suppressors or balanced by selection. By screening male stalk‐eyed flies, Cyrtodiopsis dalmanni, for brood sex ratio we found unique SR alleles at three X‐linked microsatellite loci and used them to determine if SR persists as a balanced polymorphism. We found that XSR/XST females produced more offspring than other genotypes and that SR males had lower sperm precedence and exhibited lower fertility when mating eight females in 24 h. Adult survival was independent of SR genotype but positively correlated with eye span. We infer that the SR polymorphism is likely maintained by a combination of weak overdominance for female fecundity and frequency dependent selection acting on male fertility. Our discovery of two SR haplotypes in the same population in a 10‐year period further suggests that this SR polymorphism may be evolving rapidly.
茎眼蝇属不同种群之间的微卫星变异。
DOI：
10.1017/s0016672304006986
发表时间：
2004
期刊：
Genetical research
影响因子：
--
作者：
Wright,TimothyF;Johns,PhilipM;Walters,JamesR;Lerner,AdamP;Swallow,JohnG;Wilkinson,GeraldS
通讯作者：
Wilkinson,GeraldS