Genetic basis for the evolution of pelvic‐fin brooding, a new mode of reproduction, in a Sulawesian fish
Genetic basis for the evolution of pelvic‐fin brooding, a new mode of reproduction, in a Sulawesian fish
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DOI：
10.1111/mec.16555
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发表时间：
2022-05
影响因子：
4.9
通讯作者：
J. Montenegro;Shingo Fujimoto;Satoshi Ansai;A. Nagano;M. Sato;Yusuke Maeda;Rieko Tanaka;K. Masengi;R. Kimura;J. Kitano;K. Yamahira
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文献类型：
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作者：
J. Montenegro;Shingo Fujimoto;Satoshi Ansai;A. Nagano;M. Sato;Yusuke Maeda;Rieko Tanaka;K. Masengi;R. Kimura;J. Kitano;K. Yamahira
动物的繁殖模式多种多样，不同的模式在不同类群的多个谱系中独立进化。然而，对驱动不同繁殖模式之间转变的基因组变化的理解是有限的。苏拉威西岛上的几种米鱼（Adrianichthyidae）有一种独特的繁殖方式，称为“腹鳍育雏”，其中雌性携带外部受精卵，直到用腹鳍孵化。系统发育分析表明，腹鳍育雏鱼在阿德里安鱼科的两个远缘进化支中至少进化了两次。我们研究了这种独特繁殖模式进化的遗传结构。形态学分析和实验室观察表明，雌性腹鳍育雏鱼具有更长的腹鳍和更深的腹部凹度，并且它们携带卵的时间比非育雏鱼的时间更长，这表明这些特征在这种繁殖模式中发挥着重要作用。使用腹鳍育雏鱼 Oryziaseversi 和非育雏 O. dopingdopingensis 之间的杂交进行的数量性状基因座作图揭示了参与腹鳍育雏的不同性状由不同染色体上的不同基因座控制。对混合物的基因组分析没有检测到两个具有腹鳍育雏器的谱系之间存在基因渗入的特征，这表明基因渗入不太可能是腹鳍育雏的重复进化的原因。这些发现表明，多个独立的突变可能促成了这种新型繁殖模式的趋同进化。
Modes of reproduction in animals are diverse, with different modes having evolved independently in multiple lineages across a variety of taxa. However, an understanding of the genomic change driving the transition between different modes of reproduction is limited. Several ricefishes (Adrianichthyidae) on the island of Sulawesi have a unique mode of reproduction called “pelvic‐fin brooding,” wherein females carry externally fertilized eggs until hatching using their pelvic fins. Phylogenomic analysis demonstrated pelvic‐fin brooders to have evolved at least twice in two distant clades of the Adrianichthyidae. We investigated the genetic architecture of the evolution of this unique mode of reproduction. Morphological analyses and laboratory observations revealed that females of pelvic‐fin brooders have longer pelvic fins and a deeper abdominal concavity, and that they can carry an egg clutch for longer than nonbrooding adrianichthyids, suggesting that these traits play important roles in this reproductive mode. Quantitative trait locus mapping using a cross between a pelvic‐fin brooder Oryzias eversi and a nonbrooding O. dopingdopingensis reveals different traits involved in pelvic‐fin brooding to be controlled by different loci on different chromosomes. Genomic analyses of admixture detected no signatures of introgression between two lineages with pelvic‐fin brooders, indicating that introgression is unlikely to be responsible for repeated evolution of pelvic‐fin brooding. These findings suggest that multiple independent mutations may have contributed to the convergent evolution of this novel mode of reproduction.