MICROORGANISMS ASSOCIATED WITH CHROMOSOME DESTRUCTION AND REPRODUCTIVE ISOLATION BETWEEN 2 INSECT SPECIES
MICROORGANISMS ASSOCIATED WITH CHROMOSOME DESTRUCTION AND REPRODUCTIVE ISOLATION BETWEEN 2 INSECT SPECIES
复制标题
DOI：
10.1038/346558a0
复制
发表时间：
1990-08-09
期刊：
影响因子：
64.8
通讯作者：
WERREN, JH
中科院分区：
文献类型：
--
作者：
BREEUWER, JAJ;WERREN, JH
微生物与多种昆虫物种的细胞质不亲和性有关，包括蚊子、果蝇、甲虫和wasps1-17。这种影响通常是单向的：不亲和的杂交不产生后代1-11或不育的雄性12-14，而正反交产生正常的后代。寄生黄蜂是为数不多的已知不亲和性细胞遗传学机制的物种之一。在这个物种中，父系染色体在受精卵中形成纠缠在一起的团块，并最终丢失。在这里，我们报告细胞质微生物与完全双向不亲和性有关。和一种亲缘关系密切的同域种--吉拉乌尔提。在这两个物种的卵中都可以看到微生物。杂交后代通常不会在这两个物种之间的杂交中产生，但在通过抗生素治疗消除微生物后确实会产生。细胞遗传学和遗传学研究表明，双向种间不亲和性是由于父本染色体的不适当凝集造成的。微生物介导的生殖隔离是很有兴趣的，因为它可以提供一种快速的物种18，19的模式。不亲和性的机制也是研究染色体印记和染色体凝集的潜在工具。
MICROORGANISMS have been implicated in causing cytoplasmic incompatibility in a variety of insect species, including mosquitoes, fruitflies, beetles and wasps1–17. The effect is typically unidirectional: incompatible crosses produce no progeny1–11or sterile males12–14, whereas the reciprocal crosses produce normal progeny. The parasitic waspNasonia vitripennisis one of the few species in which the cytogenetic mechanism of incompatibility is known. In this species the paternal chromosome set forms a tangled mass in a fertilized egg and is eventually lost16. Here we report that cytoplasmic microorganisms are associated with complete bidirectional incompatibility betweenN. vitripennisand a closely related sympatric species,N. giraulti. Microorganisms can be seen in the eggs of both species. Hybrid offspring are normally not produced in crosses between the two species, but do occur after elimination of the microorganisms by antibiotic treatment. A cytogenetic and genetic study shows that bidirectional interspecific incompatibility is due to improper condensation of the paternal chromosomes. Microorganism-mediated reproductive isolation is of interest because it could provide a rapid mode of speciation18,19. The mechanism of incompatibility inNasoniais also of interest as a potential tool for studyingchromosomeimprinting and chromosome condensation.