A maternal-effect selfish genetic element in Caenorhabditis elegans.

A maternal-effect selfish genetic element in Caenorhabditis elegans.
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DOI:
10.1126/science.aan0621
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发表时间:
2017-06-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Kruglyak L
Kruglyak L
中科院分区:
其他
文献类型:
--
作者:
Ben-David E;Burga A;Kruglyak L

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自私的遗传元素在自然种群中传播,并在基因组进化中发挥重要作用。我们在线虫野生品系之间的杂交中发现了一种导致胚胎致死的自私因素。该元素由Sup-35和PHA-1组成,Sup-35是一种母体效应毒素,可以杀死发育中的胚胎,PHA-1是其合子表达的解毒剂。根据其突变表型,PHA-1长期以来一直被认为是咽部发育所必需的,但这种表型是由于失去了对sup-35毒性的抑制。Sup-35/pha-1元件的非活性拷贝显示出与活跃拷贝的高度序列差异,系统发育重建表明它们代表了该元件进化的祖先阶段。我们的结果表明,通过基因筛查确定的其他必要基因可能是自私因素的组成部分。
Selfish genetic elements spread in natural populations and have an important role in genome evolution. We discovered a selfish element causing embryonic lethality in crosses between wild strains of the nematode Caenorhabditis elegans. The element is made up of sup-35, a maternal-effect toxin that kills developing embryos, and pha-1, its zygotically expressed antidote. pha-1 has long been considered essential for pharynx development on the basis of its mutant phenotype, but this phenotype arises from a loss of suppression of sup-35 toxicity. Inactive copies of the sup-35/pha-1 element show high sequence divergence from active copies, and phylogenetic reconstruction suggests that they represent ancestral stages in the evolution of the element. Our results suggest that other essential genes identified by genetic screens may turn out to be components of selfish elements.
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