Abundant occurrence of basal radial glia in the subventricular zone of embryonic neocortex of a lissencephalic primate, the common marmoset Callithrix jacchus.

Abundant occurrence of basal radial glia in the subventricular zone of embryonic neocortex of a lissencephalic primate, the common marmoset Callithrix jacchus.
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DOI:
10.1093/cercor/bhr301
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发表时间:
2012-02
期刊:
Cerebral cortex (New York, N.Y. : 1991)
影响因子:
--
通讯作者:
Borrell V
Borrell V
中科院分区:
其他
文献类型:
--
作者:
Kelava I;Reillo I;Murayama AY;Kalinka AT;Stenzel D;Tomancak P;Matsuzaki F;Lebrand C;Sasaki E;Schwamborn JC;Okano H;Huttner WB;Borrell V

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脑室下区(SVZ)前体细胞是发育中的新皮质的标志。最近的研究描述了一种新型的SVZ前体细胞,它在有丝分裂时保留基本过程,维持放射状胶质标记的表达,并能够自我更新。这些前体细胞在轮脑灵长类动物(人)和非灵长类动物(雪貂)的SVZ中相对丰富,但在同脑啮齿动物(小鼠)中不存在。在这里,我们分析了常见的绒猴Callithrix Jacchus,一种近脑灵长类动物胚胎新皮质中BRG细胞的出现。在绒猴SVZ中,BRG细胞表达Pax6、Sox2(但不表达Tbr2)、谷氨酸转运体和胶质纤维酸性蛋白,并在有丝分裂时保留基本突起,其相对丰度与人和雪貂相似。胚胎绒猴处于M期的祖细胞比例低于发育中的雪貂新皮质,这增加了细胞周期较长的可能性。将26种类人猿的回旋指数与进化模型进行了拟合,表明绒猴是从一个回脑祖先进化而来的。我们的结果表明,高相对丰度的BRG细胞可能是轮脑发育所必需的,但不是充分的,而且绒猴的无脑发育是通过改变祖细胞类型以外的祖细胞参数而辅助进化的。
Subventricular zone (SVZ) progenitors are a hallmark of the developing neocortex. Recent studies described a novel type of SVZ progenitor that retains a basal process at mitosis, sustains expression of radial glial markers, and is capable of self-renewal. These progenitors, referred to here as basal radial glia (bRG), occur at high relative abundance in the SVZ of gyrencephalic primates (human) and nonprimates (ferret) but not lissencephalic rodents (mouse). Here, we analyzed the occurrence of bRG cells in the embryonic neocortex of the common marmoset Callithrix jacchus, a near-lissencephalic primate. bRG cells, expressing Pax6, Sox2 (but not Tbr2), glutamate aspartate transporter, and glial fibrillary acidic protein and retaining a basal process at mitosis, occur at similar relative abundance in the marmoset SVZ as in human and ferret. The proportion of progenitors in M-phase was lower in embryonic marmoset than developing ferret neocortex, raising the possibility of a longer cell cycle. Fitting the gyrification indices of 26 anthropoid species to an evolutionary model suggested that the marmoset evolved from a gyrencephalic ancestor. Our results suggest that a high relative abundance of bRG cells may be necessary, but is not sufficient, for gyrencephaly and that the marmoset's lissencephaly evolved secondarily by changing progenitor parameters other than progenitor type.
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