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Deletion of nucleoporin Seh1 impaired neurogenesis through transcriptional regulation

ABSTRACT: To investigate the function of chromodomain helicase DNA binding protein 4 in the regulation of neural stem cell proliferation, we find out different expression of genes in neural stem cell of Chd4 knockdown

ORGANISM(S): Mus musculus

PROVIDER: GSE233530 | GEO | 2023/05/31

REPOSITORIES: GEO

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Deletion of nucleoporin Seh1 impaired neurogenesis through transcriptional regulation (ChIP-Seq)

Project description:Nucleoporin Seh1 and chromodomain helicase DNA binding protein 4 have been involved in gene regulation. To dissect direct regulated genes, we performed chromatin immunoprecipitation DNA-sequencing (ChIP-seq) for nucleoporin Seh1 or chromodomain helicase DNA binding protein 4 in neural stem cells.

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Deletion of nucleoporin Seh1 impaired neurogenesis through transcriptional regulation

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Deletion of nucleoporin Seh1 impaired neurogenesis through transcriptional regulation

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Deletion of nucleoporin Seh1 impaired neurogenesis through transcriptional regulation

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The nucleosome remodeling and deacetylase complex protein CHD4 regulates neural differentiation of mouse embryonic stem cells by down-regulating p53

Project description:Lineage specification of the three germ layers occurs during early embryogenesis and is critical for normal development. The nucleosome remodeling and deacetylase (NuRD) complex is a repressive chromatin modifier that plays a role in lineage commitment. However, the role of chromodomain helicase DNA-binding protein 4 (CHD4), one of the core subunits of the NuRD complex, in neural lineage commitment is poorly understood. Here, we report that the CHD4/NuRD complex plays a critical role in neural differentiation of mouse embryonic stem cells (ESCs). We found that RNAi-mediated Chd4 knockdown suppresses neural differentiation, as did knockdown of methyl-CpG binding domain protein Mbd3, another NuRD subunit. Chd4 and Mbd3 knockdowns similarly affected changes in global gene expression during neural differentiation and up-regulated several mesendodermal genes. However, inhibition of mesendodermal genes by knocking out the master regulators of mesendodemal lineages, Brachyury and Eomes, through a CRISPR/Cas9 approach could not restore the impaired neural differentiation caused by the Chd4 knockdown, suggesting that CHD4 controls neural differentiation not by repressing other lineage differentiation processes. Notably, Chd4 knockdown increased the acetylation levels of p53, resulted in increased protein levels of p53. Double knockdown of Chd4 and p53 restored the neural differentiation rate. Furthermore, overexpression of BCL2, a downstream factor of p53, partially rescued the impaired neural differentiation caused by the Chd4 knockdown. Our findings reveal that the CHD4/NuRD complex regulates neural differentiation of ESCs by down-regulating p53.

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Project description:Maintenance and self-renewal of the spermatogonial stem cell (SSC) population is the cornerstone of male fertility. In this manuscript we have identified a key role for the nucleosome remodelling protein Chromodomain Helicase DNA binding protein 4 (CHD4) in regulating SSC function. Gene expression analyses revealed that CHD4 expression is largely restricted to spermatogonia in the mouse testis, and is particularly enriched in SSCs. Using spermatogonial transplantation techniques and RNAi mediated knockdown it was established that loss of Chd4 expression significantly impairs SSC regenerative capacity, resulting in a ~50% reduction in colonisation of recipient testes. A single cell RNA-seq comparison depicted reduced expression of ‘self-renewal’ genes such as Gfra1 and Pten following Chd4 knockdown, along with increased expression of signature progenitor genes, Neurog3 and Dazl. Co-immunoprecipitation analyses demonstrated that CHD4 regulates gene expression in spermatogonia not only though its traditional association with the remodelling complex NuRD, but also via interaction with the GDNF-responsive transcription factor SALL4. Cumulatively, the results of this study depict a previously unappreciated fundamental role for CHD4 in controlling fate decisions in the spermatogonial pool.

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Effect of depletion of Nucleoporin Seh1 on gene expression during proliferation and differentiation of neural stem cell

Project description:To investigate the function of Nucleoporin Seh1 in the regulation of neural stem cell proliferation and differentiation, we used cmv-cre-ert,seh1 inducible knockout mice's neural stem cell to find out different expression genes

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CHD4 acts as a critical regulator in the survival of spermatogonial stem cells in mice [CUT&TAG]

Project description:Male spermatogenesis is sustained by homeostatic balance between the self-renewal and differentiation of spermatogonial stem cells (SSCs), which is dependent on the strict regulation of transcriptional factor and chromatin modulator gene expression. Chromodomain helicase DNA-binding protein 4 (CHD4) is highly expressed in SSCs but roles in mouse spermatogenesis are unexplored. Here, we report that the germ-cell-specific deletion of Chd4 resulted in complete infertility in male mice, with rapid loss of SSCs and excessive germ cell apoptosis. Chd4-knockdown in cultured SSCs also promoted the expression of apoptosis-related genes and thereby activated the tumor necrosis factor signaling pathway. Mechanistically, CHD4 occupies the genomic regulatory region of key apoptosis-related genes including Jun and Nfkb1. Together, our findings reveal the determinant role of CHD4 in SSCs survival in vivo, which will offer insight into the pathogenesis of male sterility and potential novel therapeutic targets.

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