Trichoplax genomes reveal profound admixture and suggest stable wild populations without bisexual reproduction.
Trichoplax genomes reveal profound admixture and suggest stable wild populations without bisexual reproduction.
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DOI：
10.1038/s41598-018-29400-y
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发表时间：
2018-07-24
影响因子：
4.6
通讯作者：
Schierwater B
中科院分区：
文献类型：
--
作者：
Kamm K;Osigus HJ;Stadler PF;DeSalle R;Schierwater B
虽然可以通过分子标记、地理分布和环境需求来区分几个谱系，但盘虫门只有一个被描述的物种——粘毛虫。盘虫16S单倍型H2 （Trichoplax sp. H2）是迄今为止发现的最强壮和最广泛的盘虫谱系。在这项研究中，由于非常独特的原因，它的基因组被发现是不同的，但与黏着毛盘虫参考基因组高度相关。这两个世系之间的变异模式和等位基因分布表明，它们都起源于至少几十年前的一次野外杂交事件，而且从那以后，它们似乎都没有进行过有性繁殖。我们得出结论，某些单倍型的placozoan种群在没有双性生殖的情况下长期保持稳定。此外，两种毛虫谱系内部和之间的等位基因变异表明，在相关的placozoan谱系之间成功的双性生殖可能有助于抵消累积的负体细胞突变或应对不断变化的环境条件。另一方面，通过营养繁殖丰富中性或有益的体细胞突变，结合罕见的有性繁殖，可以瞬间促进遗传变异，产生新的生态型和最终的物种。
The phylum Placozoa officially consists of only a single described species, Trichoplax adhaerens, although several lineages can be separated by molecular markers, geographical distributions and environmental demands. The placozoan 16S haplotype H2 (Trichoplax sp. H2) is the most robust and cosmopolitan lineage of placozoans found to date. In this study, its genome was found to be distinct but highly related to the Trichoplax adhaerens reference genome, for remarkably unique reasons. The pattern of variation and allele distribution between the two lineages suggests that both originate from a single interbreeding event in the wild, dating back at least several decades ago, and both seem not to have engaged in sexual reproduction since. We conclude that populations of certain placozoan haplotypes remain stable for long periods without bisexual reproduction. Furthermore, allelic variation within and between the two Trichoplax lineages indicates that successful bisexual reproduction between related placozoan lineages might serve to either counter accumulated negative somatic mutations or to cope with changing environmental conditions. On the other hand, enrichment of neutral or beneficial somatic mutations by vegetative reproduction, combined with rare sexual reproduction, could instantaneously boost genetic variation, generating novel ecotypes and eventually species.
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影响因子：
3.7
作者：
Eitel M;Osigus HJ;DeSalle R;Schierwater B
通讯作者：
Schierwater B
影响因子：
7
作者：
Kajitani R;Toshimoto K;Noguchi H;Toyoda A;Ogura Y;Okuno M;Yabana M;Harada M;Nagayasu E;Maruyama H;Kohara Y;Fujiyama A;Hayashi T;Itoh T
通讯作者：
Itoh T
DOI：
10.1093/bioinformatics/bts199
发表时间：
2012-06-15
期刊：
Bioinformatics (Oxford, England)
影响因子：
--
作者：
Kearse M;Moir R;Wilson A;Stones-Havas S;Cheung M;Sturrock S;Buxton S;Cooper A;Markowitz S;Duran C;Thierer T;Ashton B;Meintjes P;Drummond A
通讯作者：
Drummond A
影响因子：
1
作者：
GRELL, KG;BENWITZ, G
通讯作者：
BENWITZ, G
Aiptasia 的基因组，一种珊瑚共生的海葵模型
DOI：
10.1073/pnas.1513318112
发表时间：
2015-09-22
影响因子：
11.1
作者：
Baumgarten, Sebastian;Simakov, Oleg;Voolstra, Christian R.
通讯作者：
Voolstra, Christian R.