HAND2 Target Gene Regulatory Networks Control Atrioventricular Canal and Cardiac Valve Development.

HAND2 Target Gene Regulatory Networks Control Atrioventricular Canal and Cardiac Valve Development.
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DOI:
10.1016/j.celrep.2017.05.004
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发表时间:
2017-05-23
期刊:
影响因子:
8.8
通讯作者:
Zeller R
Zeller R
中科院分区:
生物学1区
文献类型:
--
作者:
Laurent F;Girdziusaite A;Gamart J;Barozzi I;Osterwalder M;Akiyama JA;Lincoln J;Lopez-Rios J;Visel A;Zuniga A;Zeller R

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HAND2转录调节因子控制心脏发育,我们发现在房室管(AVC)心脏缓冲发育的内皮到间充质转化(EMT)中的其他基本功能。在HAND2缺陷小鼠胚胎中,AVC心脏垫形成的EMT被破坏,我们将胚胎心脏的ChIP-Seq与野生型和突变型AVC的转录组分析相结合,以确定功能相关的HAND2靶基因。HAND2靶基因调控网络(GRN)包括大多数已知在EMT过程和AVC心垫形成中起作用的基因。其中之一是Snai1,一种EMT主调控因子,其表达在hand2缺陷AVCs中缺失。Snai1在突变AVC外植体中的重新表达部分恢复了这种EMT和间充质细胞迁移。此外,Snai1基因组图谱中的hand2相互作用增强子在胚胎心脏和其他表达Snai1的组织中也有活性。这些结果表明,HAND2直接调控启动AVC心脏瓣膜发育的分子级联反应。Laurent等人将ChIP-Seq与转录组分析相结合,确定了在房室管(AVC)心脏缓冲形成过程中控制EMT和间充质细胞迁移的HAND2靶基因网络。HAND2转录靶点包括Snai1,其在HAND2缺陷AVC外植体中的重新表达部分恢复间充质细胞迁移。
The HAND2 transcriptional regulator controls cardiac development and we uncover additional essential functions in the endothelial to mesenchymal transition (EMT) underlying cardiac cushion development in the atrioventricular canal (AVC). In Hand2-deficient mouse embryos, the EMT underlying AVC cardiac cushion formation is disrupted and we combined ChIP-Seq of embryonic hearts with transcriptome analysis of wild-type and mutants AVCs to identify the functionally relevant HAND2 target genes. The HAND2 target gene regulatory network (GRN) includes most genes with known functions in EMT processes and AVC cardiac cushion formation. One of these is Snai1, an EMT master regulator whose expression is lost from Hand2-deficient AVCs. Re-expression of Snai1 in mutant AVC explants partially restores this EMT and mesenchymal cell migration. Furthermore, the HAND2-interacting enhancers in the Snai1 genomic landscape are active in embryonic hearts and other Snai1-expressing tissues. These results show that HAND2 directly regulates the molecular cascades initiating AVC cardiac valve development. Laurent et al. combine ChIP-Seq with transcriptome analysis to identify the HAND2 target gene network that controls the EMT and mesenchymal cell migration during cardiac cushion formation in the atrioventricular canal (AVC). The HAND2 transcriptional targets include Snai1, whose re-expression in Hand2-deficient AVC explants partially restores mesenchymal cell migration.
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