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Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition

Xu-Peng Bi Guo-Jie Zhang

Xu-Peng Bi, Guo-Jie Zhang. Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition. Zoological Research, 2021, 42(2): 135-137. doi: 10.24272/j.issn.2095-8137.2021.066
Citation: Xu-Peng Bi, Guo-Jie Zhang. Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition. Zoological Research, 2021, 42(2): 135-137. doi: 10.24272/j.issn.2095-8137.2021.066

早期硬骨鱼类拥有的祖先发育潜能有助于脊椎动物从水生到陆生的转变

doi: 10.24272/j.issn.2095-8137.2021.066

Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition

Funds: This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB13000000 and XDB31020000) and the Villum Foundation (Villum Investigator Grant No. 25900)
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  • 摘要: 从水生到陆生是脊椎动物演化史上的一次飞跃,最终形成了今天包括两栖类、爬行类、鸟类和哺乳类在内的所有四足动物。我们的鱼类祖先第一次登陆大约发生于3.7亿年前的泥盆纪末期。通过对这一演化过程中的重要过渡物种如提塔利克鱼、棘螈和鱼石螈等化石的分析,发现了许多对脊椎动物陆生适应至关重要的形态学和解剖学结构。然而,通过更为古老的鱼类同源形态结构研究表明,一些与脊椎动物登陆有关的结构组织已经在早期硬骨鱼类中出现。例如,泥盆纪洛赫考夫晚期的斑鳞鱼肩胛带化石显示了内骨骼的关节面,这表明早期肉鳍鱼已经拥有与四足类肱骨相似的内骨骼发育模式。此外, 和空气呼吸相关的肺组织存在于早期辐鳍鱼类(如多鳍鱼属),所有的肉鳍鱼类以及一些鱼类化石物种中。这些化石证据表明,水陆演化可能借由一些早在登陆发生之前就已经存在的身体特征和遗传组成来实现,而不仅仅依赖于登陆过程产生的遗传创新序列。对于古生物学家来说,这种祖先发育调控网络是否存在,以及这一祖先调控网络最早追溯到哪个演化节点都是具有挑战性的问题。最近发表在《细胞》杂志上的三篇相关论文为这一假说提供了新的见解。其中两篇比较基因组学研究分别通过对非洲肺鱼、多鳍鱼、匙吻鲟、弓鳍鱼和鳄雀鳝的基因组组装,分析揭示了与四肢、肺和心脏等相关的祖先发育潜能在早期硬骨鱼类中就已经建立,它们在后续脊椎动物登陆相关的一系列生物功能的形成和演化中发挥着重要作用。虽然这些祖先特征在经历了第三次特异全基因组加倍的真骨鱼身上已经消失,但是另外一项研究工作通过修改斑马鱼的基因序列,重新激活了这些祖先遗传调控网络并在该鱼身上重现了这一古老特征。
  • Figure  1.  Phylogeny of living jawed vertebrates

    Ancestral developmental potential of lungs and limbs was established 400 million years ago.

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出版历程
  • 收稿日期:  2021-03-10
  • 录用日期:  2021-03-11
  • 网络出版日期:  2021-03-12
  • 刊出日期:  2021-03-18

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