首次从历史悠久的博物馆样本中对绿血石龙子(Prasinohaema aff.

IF 3 2区 生物学 Q2 EVOLUTIONARY BIOLOGY
Taylor S Probst, Daniel D Davis, Alison S Whiting, Paul B Frandsen
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引用次数: 0

摘要

羊膜动物是羊膜动物中唯一一种拥有绿色血液的动物,这是由于胆色素胆绿素的积累造成的。最近的系统发育分析表明,Prasinohaema具有多系性,具有4个独立的绿色血液起源。目前尚不清楚为什么这种特性在多个实例中进化,以及Prasinohaema物种如何能够耐受如此高浓度的细胞毒性胆汁素。在这里,我们报告了第一个从头开始的基因组组装和注释,绿血蜥蜴,Prasinohaema aff. flavipes,从20多年前收集的乙醇保存标本中测序。我们的组件包括907个组件,跨度为1.52 Gbp,组件N50为3.2 Mbp。基因组高度完整,BUSCO完备度评分为97.76%。系统发育分析证实我们的标本是P. flavipes的姐妹,具有很高的支持度;然而,这两个标本表现出深刻的遗传差异,这可能支持了它们的独特性。对编码血清白蛋白(一种已知与胆绿素结合的常见血液转运蛋白)的基因的搜索表明,它在我们的黄鳍p.a ff. flavipes基因组中缺失。然而,我们发现血清白蛋白平行甲胎蛋白的串联重复,这可能在胆绿素保留中起作用。对爬行动物甲胎蛋白序列的blast分析表明,来自Prasinohaema基因组的甲胎蛋白的两个拷贝都处于多样化选择中。我们设想这个新的基因组组装作为一个有价值的来源,在检查关键基因,调控机制,和功能突变参与升高的胆绿素水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The first de novo genome assembly and annotation of a green-blooded skink (Prasinohaema aff. flavipes) from a historic museum sample.

The scincid genus Prasinohaema represents the only group of amniotes to possess green blood, resulting from the accumulation of the bile pigment biliverdin. Recent phylogenetic analyses have shown Prasinohaema to be polyphyletic with 4 independent origins for green blood. It is unknown why this trait has evolved in multiple instances and how Prasinohaema species are able to tolerate such high concentrations of a cytotoxic bile pigment. Here, we report the first de novo genome assembly and annotation for a green blooded skink, Prasinohaema aff. flavipes, which was sequenced from an ethanol preserved specimen that was collected more than 20 years ago. Our assembly comprises 907 contigs spanning 1.52 Gbp with contig N50 of 3.2 Mbp. The genome is highly complete, with a BUSCO completeness score of 97.76%. Phylogenetic analysis confirmed that our specimen is sister to P. flavipes with high support; however, the two specimens exhibit deep genetic divergence, perhaps supporting their distinctiveness. Searches for the gene encoding serum albumin, a common blood transport protein known to bind biliverdin, suggested it is absent from our P. aff. flavipes genome. Yet, we found a tandem duplication of the serum albumin paralog alpha-fetoprotein, which may play a role in biliverdin retention. BUSTED analysis of alpha-fetoprotein sequences across reptiles revealed that both copies of alpha-fetoprotein from our Prasinohaema genome are under diversifying selection. We envision this new genome assembly as a valuable source in examining the key genes, regulatory mechanisms, and functional mutations involved in the elevated biliverdin levels.

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来源期刊
Journal of Heredity
Journal of Heredity 生物-遗传学
CiteScore
5.20
自引率
6.50%
发文量
63
审稿时长
6-12 weeks
期刊介绍: Over the last 100 years, the Journal of Heredity has established and maintained a tradition of scholarly excellence in the publication of genetics research. Virtually every major figure in the field has contributed to the journal. Established in 1903, Journal of Heredity covers organismal genetics across a wide range of disciplines and taxa. Articles include such rapidly advancing fields as conservation genetics of endangered species, population structure and phylogeography, molecular evolution and speciation, molecular genetics of disease resistance in plants and animals, genetic biodiversity and relevant computer programs.
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