Control of species-dependent cortico-motoneuronal connections underlying manual dexterity.

Control of species-dependent cortico-motoneuronal connections underlying manual dexterity.
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控制物种依赖性的皮质 - - - - - 波负元连接的手动敏捷性。

DOI:
10.1126/science.aan3721
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发表时间:
2017-07-28
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Yoshida Y
Yoshida Y
中科院分区:
其他
文献类型:
--
作者:
Gu Z;Kalambogias J;Yoshioka S;Han W;Li Z;Kawasawa YI;Pochareddy S;Li Z;Liu F;Xu X;Wijeratne HRS;Ueno M;Blatz E;Salomone J;Kumanogoh A;Rasin MR;Gebelein B;Weirauch MT;Sestan N;Martin JH;Yoshida Y

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高级灵长类动物的上级手灵巧性是在哺乳动物皮质脊髓(CS)系统进化过程中与皮质-运动神经元(CM)连接一起出现的。以前被认为是高等灵长类动物所特有的,我们在出生后早期的小鼠中发现了短暂的CM连接,这些连接最终被Sema 6D-PlexA 1信号消除。PlexA 1突变小鼠保持CM连接到成年期,并表现出上级手动灵巧性相比,控制。最后,不同的PlexA 1表达在第5层的运动皮层,这是强在野生型小鼠,但在人类中弱,可以解释FEZF 2介导的顺式调控元件,只发现在高等灵长类动物。因此,PlexA 1表达的物种依赖性调节可能在哺乳动物CS系统的进化中至关重要,该系统改善了高等灵长类动物的精细运动控制。
Superior manual dexterity in higher primates emerged together with the appearance of cortico-motoneuronal (CM) connections during the evolution of the mammalian corticospinal (CS) system. Previously thought to be unique to higher primates, we identified transient CM connections in early postnatal mice, which are eventually eliminated by Sema6D-PlexA1 signaling. PlexA1 mutant mice maintain CM connections into adulthood and exhibit superior manual dexterity compared to controls. Finally, differing PlexA1 expression in layer 5 of the motor cortex, which is strong in wild-type mice but weak in humans, may be explained by FEZF2-mediated cis-regulatory elements that are found only in higher primates. Thus, species-dependent regulation of PlexA1 expression may have been crucial in the evolution of mammalian CS systems that improved fine motor control in higher primates.
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