Genome size variation in deep-sea amphipods.

Genome size variation in deep-sea amphipods.
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DOI:
10.1098/rsos.170862
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发表时间:
2017-09
影响因子:
3.5
通讯作者:
Piertney SB
Piertney SB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ritchie H;Jamieson AJ;Piertney SB

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基因组大小在不同的类群中差异很大,人们已经做出了广泛的研究努力,以了解这种差异是否可以通过物种间关键生态和生活史特征的差异来解释。深海特有的极端环境条件被认为促进了真核生物的大基因组。在这里,我们通过检查来自马里亚纳海沟、克尔马德克海沟和新赫布里底海沟的13种深海两足类的基因组大小来检验这一假设。用流式细胞仪对基因组大小进行了估计,发现基因组大小变化了9倍,从4.0 6 PG(4.0 4 GB)到34.79 PG(34.0 2 GB)不等。独立于系统发育的对比分析确定了基因组大小和最大体型之间的关系,尽管这在很大程度上是由那些表现出体型巨人症的物种推动的。与群体中的其他物种相比,超大型双足类动物的基因组大小特征多样化比率发生了明显的变化。观察到的基因组大小的变化是惊人的,并反对深海两足类的共同进化史、生态位和生活史策略驱动基因组大小。
Genome size varies considerably across taxa, and extensive research effort has gone into understanding whether variation can be explained by differences in key ecological and life-history traits among species. The extreme environmental conditions that characterize the deep sea have been hypothesized to promote large genome sizes in eukaryotes. Here we test this supposition by examining genome sizes among 13 species of deep-sea amphipods from the Mariana, Kermadec and New Hebrides trenches. Genome sizes were estimated using flow cytometry and found to vary nine-fold, ranging from 4.06 pg (4.04 Gb) in Paralicella caperesca to 34.79 pg (34.02 Gb) in Alicella gigantea. Phylogenetic independent contrast analysis identified a relationship between genome size and maximum body size, though this was largely driven by those species that display size gigantism. There was a distinct shift in the genome size trait diversification rate in the supergiant amphipod A. gigantea relative to the rest of the group. The variation in genome size observed is striking and argues against genome size being driven by a common evolutionary history, ecological niche and life-history strategy in deep-sea amphipods.
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影响因子: 6.3
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