N-Myc and GCN5 regulate significantly overlapping transcriptional programs in neural stem cells.

N-Myc and GCN5 regulate significantly overlapping transcriptional programs in neural stem cells.
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DOI:
10.1371/journal.pone.0039456
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Knoepfler PS
Knoepfler PS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Martínez-Cerdeño V;Lemen JM;Chan V;Wey A;Lin W;Dent SR;Knoepfler PS

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在这里,我们使用由 nestin-cre 驱动的条件敲除方法检查 Myc 辅因子和组蛋白乙酰转移酶 GCN5/KAT2A 在神经干细胞和前体细胞 (NSC) 中的功能。具有 GCN5 缺陷的 NSC 小鼠的脑质量减少了 25%,具有小头畸形表型,类似于在 nestin-cre 驱动的 c- 或 N-myc 敲除中观察到的结果。此外,GCN5 的缺失会抑制前体细胞增殖并减少其体内数量,N-myc 的缺失也是如此。基因表达分析表明,大约六分之一的表达受到 GCN5 缺失影响的基因也会以同样的方式受到 N-myc 缺失的影响。这些发现有力地支持了 GCN5 蛋白是 NSC 中关键的 N-Myc 转录辅助因子的观点,但也与其他转录因子对 GCN5 的募集以及 N-Myc 使用其他组蛋白乙酰转移酶的情况一致。假定的 N-Myc/GCN5 共同调节的转录途径包括细胞代谢、细胞周期、染色质和神经元投射形态发生基因。 GCN5 也是维持其假定的特定靶基因和 Myc 靶标处的组蛋白乙酰化所必需的。因此,我们定义了 GCN5 在 NSC 中的重要作用,并提供了 GCN5 是体内重要的 Myc 转录辅助因子的证据。
Here we examine the functions of the Myc cofactor and histone acetyltransferase, GCN5/KAT2A, in neural stem and precursor cells (NSC) using a conditional knockout approach driven by nestin-cre. Mice with GCN5-deficient NSC exhibit a 25% reduction in brain mass with a microcephaly phenotype similar to that observed in nestin-cre driven knockouts of c- or N-myc. In addition, the loss of GCN5 inhibits precursor cell proliferation and reduces their populations in vivo, as does loss of N-myc. Gene expression analysis indicates that about one-sixth of genes whose expression is affected by loss of GCN5 are also affected in the same manner by loss of N-myc. These findings strongly support the notion that GCN5 protein is a key N-Myc transcriptional cofactor in NSC, but are also consistent with recruitment of GCN5 by other transcription factors and the use by N-Myc of other histone acetyltransferases. Putative N-Myc/GCN5 coregulated transcriptional pathways include cell metabolism, cell cycle, chromatin, and neuron projection morphogenesis genes. GCN5 is also required for maintenance of histone acetylation both at its putative specific target genes and at Myc targets. Thus, we have defined an important role for GCN5 in NSC and provided evidence that GCN5 is an important Myc transcriptional cofactor in vivo.
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