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“十大黄台”-梳理天下新闻

鳄鱼头部鳞十大黄台片如何形成?最新研究确认为机械折叠过程而非遗传机制

来源: 中国航天报
2024-12-13 04:31:42

最佳回答

“十大黄台”鳄鱼头部鳞十大黄台片如何形成?最新研究确认为机械折叠过程而非遗传机制

  中新十大黄台网北京12月12日电 (记者 十大黄台孙自法)国际著名学术期刊《自然》最新发表一项演化研究论文称,鳄鱼面部与下颌独特的鳞片图案是由一种精确的皮肤机械折叠过程形成的。这一研究结果验证了之前的观点,即这些鳞片来自某种机械过程而非遗传机制,从而为了解该过程背后的细节提供了新的见解。

论文中解读展示的本次研究成果相关图片。施普林格自然 供图

  该论文介绍,动物的附属器官如羽毛、毛发和鳞片等,通常作为受遗传调控的单元在胚胎发育期间发育,但这一规则也有例外,如鳄鱼头部的鳞片被发现完全由机械过程产生。不过,形成头部鳞片图案的精确机制一直很难确定,一定程度上是因为用鳄鱼胚胎做实验存在技术难度。

  在本项研究中,论文通讯作者、瑞士日内瓦大学Michel C. Milinkovitch和合作者一起,通过将尼罗鳄胚胎实验与计算机模拟相结合,生成了一个三维机械发育模型,重现了鳄鱼头部鳞片的图案结构。他们发现,这些鳞片会通过简单的机械过程自我组织,比如因皮肤比皮下骨骼发育更快以及这些不同组织的硬度差异而导致的挤压褶皱。

  论文作者总结表示,这个机械折叠过程会使鳄鱼头部的鳞片形成不规则的几何图案,这与鳄鱼身体鳞片作为受遗传调控单元的发育方式截然不同。(完)

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