Meiotic Genes in Colpodean Ciliates Support Secretive Sexuality.

Meiotic Genes in Colpodean Ciliates Support Secretive Sexuality.
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Colpodean纤毛中的减数分裂基因支持秘密性。

DOI:
10.1093/gbe/evx125
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发表时间:
2017-06-01
影响因子:
3.3
通讯作者:
Mahé F
Mahé F
中科院分区:
生物学2区
文献类型:
--
作者:
Dunthorn M;Zufall RA;Chi J;Paszkiewicz K;Moore K;Mahé F

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被认为是无性的蛇尾目纤毛虫可能会对进化论的宏观组织理论构成一个问题。它们非常古老(尽管无性恋被认为会加速灭绝),但有一种明显的有性物种(意味着不太可能重新获得一种复杂的特征)。然而,如果进化的大组织理论也广泛适用于微生物真核生物,那么大多数或所有的鞘足目纤毛虫应该只是暗地里有性行为。在这里,我们使用从头测序的方法显示,鞘翅目纤毛虫具有有性繁殖所需的减数分裂基因,这些基因处于功能限制之下。结合这些基因组数据,我们认为这些纤毛虫是有性行为的,因为它们的细胞内有微核和大核,并有短暂融合的行为观察,就像细胞交配一样。因此,鞘翅目纤毛虫带来的挑战不是进化理论,而是我们在实验室诱导微生物真核有性繁殖的能力。
The putatively asexual Colpodean ciliates potentially pose a problem to macro-organismic theories of evolution. They are extremely ancient (although asexuality is thought to hasten extinction), and yet there is one apparently derived sexual species (implying an unlikely regain of a complex trait). If macro-organismic theories of evolution also broadly apply to microbial eukaryotes, though, then most or all of the colpodean ciliates should merely be secretively sexual. Here we show using de novo genome sequencing, that colpodean ciliates have the meiotic genes required for sex and these genes are under functional constraint. Along with these genomic data, we argue that these ciliates are sexual given the cytological observations of both micronuclei and macronuclei within their cells, and the behavioral observations of brief fusions as if the cells were mating. The challenge that colpodean ciliates pose is therefore not to evolutionary theory, but to our ability to induce microbial eukaryotic sex in the laboratory.
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