Evo-Devo of the Fin-to-Limb Transition

Evo-Devo of the Fin-to-Limb Transition
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鳍到肢过渡的进化-发育

DOI:
10.1007/978-3-319-33038-9_193-1
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发表时间:
2020
期刊:
Evolutionary Developmental Biology
影响因子:
--
通讯作者:
Koji Tamura
Koji Tamura
中科院分区:
--
文献类型:
--
作者:
Yoshitaka Tanaka;Hidehiro Kudoh;Gembu Abe;Sayuri Yonei-Tamura;Koji Tamura

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四足动物的四肢由成对的鳍进化而来。虽然四肢和鳍有相似的组织组成、结构和发育过程,但鳍的骨骼形态的一些特征与四肢不同。鳍鳍是鳍的最末端部分,由几种四足动物中看不到的组织组成。硬鱼的鳍鳍骨骼与同样发育在鳍芽中的基底内骨骼具有相同的发育起源(侧板中胚层,LPM)。鳍芽的外胚层外壳沿背腹缘有一个脊,称为顶端外胚层脊(AER),在发育过程中延伸成顶端褶皱(AF)。四足动物的肢芽从未经历过这种转变,这表明上皮细胞的变化可能是理解鳍到肢转变背后的进化发育机制的关键。上皮细胞的转化涉及细胞形状的改变,这可能在鱼鳍到四肢的进化中起作用。
Tetrapod limbs evolved from paired fins. Although the limbs and fins share similar sets of tissue components, structure, and developmental processes, some characteristics of the skeletal morphology of fins are distinct from those of limbs. Fin rays, the distal-most components of the fin, consist of several types of tissues not seen in tetrapods. The fin ray skeletons of teleosts have the same developmental origin (lateral plate mesoderm, LPM) as that of the basal endoskeleton that also develops in the fin bud. The ectodermal jacket of the fin bud has a ridge along the dorsoventral border called the apical ectodermal ridge (AER), which elongates into the apical fold (AF) during development. Tetrapod limb buds never undergo this transformation, suggesting that epithelial changes might be the key to understanding the evolutionary developmental mechanism behind the fin-to-limb transition. The epithelial transformation involves a change in cell shape, which may have played a role in the fin-to-limb evolution.
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