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Embryological Evidence Identifies Wing Digits in Birds as Digits 1, 2, and 3

机译:胚胎学证据将鸟类的机翼数字识别为数字1、2和3

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摘要

The identities of the digits of the avian forelimb are disputed. Whereas paleontologkal findings support the position that the digits correspond to digits one, two, and three, embryological evidence points to digit two, three, and four identities. By using transplantation and cell-labeling experiments, we found that the posteriormost digit in the wing does not correspond to digit four in the hindlimb; its progenitor segregates early from the zone of polarizing activity, placing it in the domain of digit three specification. We suggest that an avian-specific shift uncouples the digit anlagen from the molecular mechanisms that pattern them, resulting in the imposition of digit one, two, and three identities on the second, third, and fourth anlagens.
机译:禽前肢的数字身份是有争议的。古生物学的发现支持以下观点:数字对应于数字1、2和3,而胚胎学证据则指向数字2、3和4。通过移植和细胞标记实验,我们发现机翼中的最后一个数字与后肢中的第四个数字不对应。它的祖细胞较早地从极化活动区中分离出来,处于第三个数位域。我们建议禽类特定的移位使数字化阿拉伯人元素与使它们模式化的分子机制脱钩,从而导致在第二,第三和第四类人猿中强加数字一,二和三个身份。

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  • 来源
    《Science》 |2011年第6018期|p.753-757|共5页
  • 作者单位

    Department of Developmental Biology and Neurosciences,Graduate School of Life Sciences, Tohoku University, Aobayama,Aoba-ku, Sendai 980-8578, Japan;

    Department of Developmental Biology and Neurosciences,Graduate School of Life Sciences, Tohoku University, Aobayama,Aoba-ku, Sendai 980-8578, Japan;

    Department of Developmental Biology and Neurosciences,Graduate School of Life Sciences, Tohoku University, Aobayama,Aoba-ku, Sendai 980-8578, Japan;

    Department of Developmental Biology and Neurosciences,Graduate School of Life Sciences, Tohoku University, Aobayama,Aoba-ku, Sendai 980-8578, Japan;

    Department of Developmental Biology and Neurosciences,Graduate School of Life Sciences, Tohoku University, Aobayama,Aoba-ku, Sendai 980-8578, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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