Phylogenomic resolution of the root of Panpulmonata, a hyperdiverse radiation of gastropods: new insight into the evolution of air breathing.
Phylogenomic resolution of the root of Panpulmonata, a hyperdiverse radiation of gastropods: new insight into the evolution of air breathing.
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Panpulmonata 根的系统发育解析，腹足动物的高度多样化辐射：对空气呼吸进化的新见解。
DOI：
10.1098/rspb.2021.1855
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Kocot,KevinM
中科院分区：
文献类型：
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作者：
Krug,PatrickJ;Caplins,SerenaA;Algoso,Krisha;Thomas,Kanique;Valdés,ÁngelA;Wade,Rachael;Wong,NurLeenaWS;Eernisse,DouglasJ;Kocot,KevinM
向陆地动物的过渡与主要的动物辐射有关，包括stylommatophhora中的陆地蜗牛和蛞蝓（已描述的物种约有20万种），这是最成功的“肺动物”谱系（一种呼吸空气的腹足类动物的非单系组合）。然而，系统基因组学研究未能有力地解决传统肺门动物和附属海洋谱系之间的关系，这些谱系包括进化支泛肺门动物（软体动物，腹足动物），特别是两个关键分类群：Sacoglossa，一组包括光合海蛞蝓，和Siphonarioidea，潮间带帽贝状蜗牛，具有不可收缩的肺小体（狭窄的开口通往血管化的pallial腔）。为了阐明全肺辐射的进化史，我们对110种腹足类动物多达1160个核蛋白编码基因的数据集进行了系统基因组分析，包括Sacoglossa和Siphonarioidea的40个新的转录组。所有18项分析都发现Sacoglossa是我们命名为Pneumopulmonata的分支的姐妹类群，其中Siphonarioidea在大多数分析中是其余谱系的姐妹类群。比较模型表明，向边缘栖息地（河口、红树林和潮间带）的迁移先于并加速了肺小体的进化，该进化与单侧复制鳃一起存在于肺小体祖先中。这些发现强调了呼吸空气的蜗牛进化的关键中间阶段，支持了对边缘地带的适应在主要的海陆过渡中起重要作用的假设。
Transitions to terrestriality have been associated with major animal radiations including land snails and slugs in Stylommatophora (>20 000 described species), the most successful lineage of ‘pulmonates’ (a non-monophyletic assemblage of air-breathing gastropods). However, phylogenomic studies have failed to robustly resolve relationships among traditional pulmonates and affiliated marine lineages that comprise clade Panpulmonata (Mollusca, Gastropoda), especially two key taxa: Sacoglossa, a group including photosynthetic sea slugs, and Siphonarioidea, intertidal limpet-like snails with a non-contractile pneumostome (narrow opening to a vascularized pallial cavity). To clarify the evolutionary history of the panpulmonate radiation, we performed phylogenomic analyses on datasets of up to 1160 nuclear protein-coding genes for 110 gastropods, including 40 new transcriptomes for Sacoglossa and Siphonarioidea. All 18 analyses recovered Sacoglossa as the sister group to a clade we named Pneumopulmonata, within which Siphonarioidea was sister to the remaining lineages in most analyses. Comparative modelling indicated shifts to marginal habitat (estuarine, mangrove and intertidal zones) preceded and accelerated the evolution of a pneumostome, present in the pneumopulmonate ancestor along with a one-sided plicate gill. These findings highlight key intermediate stages in the evolution of air-breathing snails, supporting the hypothesis that adaptation to marginal zones played an important role in major sea-to-land transitions.