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Hemizygous deletion of the autism-associated gene CHD8 impairs synaptic function through widespread changes in gene expression and chromatin compaction (RNA-Seq)

ABSTRACT: In this study, we developed two isogenic haploinsufficient CHD8+/– human embryonic stem cell lines (hESCs) that we induced into neurons (iNs) upon doxycycline-inducible overexpression of Neurogenin 2 and Neurogenin 1 (NEUROG2/1), and we profiled the key molecular alterations in chromatin accessibility (ATAC-seq) and expression (RNA-seq) resulting from the loss of CHD8, the most recurrently mutated gene in autism spectrum disorders (ASD).

ORGANISM(S): Homo sapiens

PROVIDER: GSE236993 | GEO | 2023/07/12

REPOSITORIES: GEO

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Hemizygous deletion of the autism-associated gene CHD8 impairs synaptic function through widespread changes in gene expression and chromatin compaction (ATAC-Seq)

Project description:In this study, we developed two isogenic haploinsufficient CHD8+/– human embryonic stem cell lines (hESCs) that we induced into neurons (iNs) upon doxycycline-inducible overexpression of Neurogenin 2 and Neurogenin 1 (NEUROG2/1), and we profiled the key molecular alterations in chromatin accessibility (ATAC-seq) and expression (RNA-seq) resulting from the loss of CHD8, the most recurrently mutated gene in autism spectrum disorders (ASD).

2023-07-12 | GSE236992 | GEO

CHD8 Suppression Impacts on Histone H3 Lysine 36 Trimethylation and Alters RNA Alternative Splicing

Project description:Disruptive mutations in the chromodomain helicase DNA binding protein 8 (CHD8) have been recurrently associated with Autism Spectrum Disorders (ASD). Here we investigated how chromatin reacts to CHD8 suppression by analyzing a panel of histone modifications in induced pluripotent stem cell-derived neural progenitors. CHD8 suppression led to significant reduction (47.82%) in histone H3K36me3 peaks at gene bodies, particularly impacting on transcriptional elongation chromatin states. H3K36me3 reduction specifically affects highly expressed, CHD8-bound genes and correlates with altered alternative splicing patterns of 408 genes implicated in “regulation of RNA splicing”, “mRNA catabolic process”. Interestingly, mass-spectrometry analysis uncovered a novel interaction between CHD8 and the splicing regulator Heterogeneous Nuclear Ribonucleoprotein L (hnRNPL), providing the first mechanistic insights to explain CHD8-suppression splicing phenotype, partially implicating SETD2, H3K36me3 methyltransferase. In summary, our results point toward broad molecular consequences of CHD8 suppression, entailing altered histone deposition/maintenance and RNA processing regulation as important regulatory processes in ASD.

2023-03-11 | PXD025739 | Pride

Non-monotonic regulation of gene expression, neural progenitor fate and brain growth by the chromatin remodeller CHD8

Project description:Heterozygous CHD8 mutations are associated with autism and macrocephaly with high penetrance in the human population. The reported mutations may have loss-of-function (haploinsufficient), hypomorphic or dominant negative effects on protein function. To determine the effects of reducing CHD8 protein function below haploinsufficient levels on brain development, we established a Chd8 allelic series in the mouse. Chd8 heterozygous mice exhibited relatively subtle brain overgrowth and little gene expression changes in the embryonic neocortex. In comparison, mild Chd8 hypomorphs displayed significant postnatal lethality, with surviving animals exhibiting more pronounced brain hyperplasia, and significantly altered expression of over 2000 genes. Autism-associated genes were downregulated and neural progenitor proliferation genes upregulated. Severe Chd8 hypomorphs displayed even greater transcriptional dysregulation, affecting genes and pathways that largely overlapped with those dysregulated in the mild hypomorphs. By contrast, homozygous, conditional deletion of Chd8 in early neuronal progenitors resulted in the induction of p53 target genes, cell cycle exit, apoptosis and pronounced brain hypoplasia. Intriguingly, increased progenitor proliferation in hypomorphs was primarily restricted to TBR2+ intermediate progenitors, suggesting critical roles for CHD8 in regulating the expansion of this population. Given the importance of these progenitors in human cortical growth, this observation suggests that human brain development might be more sensitive to CHD8 deficiency than the mouse. We conclude that brain development is acutely sensitive to CHD8 dosage and that the varying sensitivities of different progenitor populations and cellular processes to CHD8 dosage can result in non-linear effects on gene transcription and brain growth.

2020-07-01 | GSE121381 | GEO

CHD8 Suppression Impacts on Histone H3 Lysine 36 Trimethylation and Alters RNA Alternative Splicing

Project description:Disruptive mutations in the chromodomain helicase DNA binding protein 8 (CHD8) have been recurrently associated with Autism Spectrum Disorders (ASD). Here we investigated how chromatin reacts to CHD8 suppression by analyzing a panel of histone modifications in induced pluripotent stem cell-derived neural progenitors. CHD8 suppression led to significant reduction (47.82%) in histone H3K36me3 peaks at gene bodies, particularly impacting on transcriptional elongation chromatin states. H3K36me3 reduction specifically affects highly expressed, CHD8-bound genes and correlates with altered alternative splicing patterns of 462 genes implicated in “regulation of RNA splicing”, “mRNA catabolic process”. Interestingly, mass-spectrometry analysis uncovered a novel interaction between CHD8 and the splicing regulator Heterogeneous Nuclear Ribonucleoprotein L (hnRNPL), providing the first mechanistic insights to explain CHD8-suppression splicing phenotype, partially implicating SETD2, H3K36me3 methyltransferase. In summary, our results point toward broad molecular consequences of CHD8 suppression, entailing altered histone deposition/maintenance and RNA processing regulation as important regulatory processes in ASD.

2022-01-31 | GSE148057 | GEO

Developmental pyrethroid exposure and age influence phenotypes in a Chd8 haploinsufficient autism mouse model

Project description:Hundreds of genes have been associated with autism spectrum disorder (ASD), including loss-of-function mutations in chromodomain helicase DNA binding protein 8 (Chd8). Environmental factors also are implicated in autism risk and have the potential to exacerbate phenotypes in genetically sensitized backgrounds. Here we investigate transcriptional and behavioral phenotypes in a Chd8 haploinsufficient (Chd8V986*/+) mouse line exposed to the pesticide deltamethrin (DM) from conception to postnatal day 22. Vehicle-exposed Chd8V986*/+ mice displayed ASD-associated phenotypes, including anxiety-like behavior and altered sociability, replicating a previous study with this mouse line. A core set of genes was altered in Chd8V986*/+ mice at multiple ages, including Usp11, Wars2, Crlf2, and Eglf6, and proximity ligation data indicated direct binding of CHD8 to the 5’ region of these genes. Moreover, a neurodegenerative transcriptional phenotype was apparent in 12 and 18 month old Chd8V986*/+ mice. Following DM exposure, the mutant mice displayed an exacerbated phenotype in the elevated plus maze, and genes associated with vascular endothelial cells were downregulated in the cerebral cortex of older Chd8V986*/+ animals. Our study reveals a gene x environment interaction with a Chd8 haploinsufficient mouse line and points to the importance of investigating phenotypes in ASD animal models across the lifespan.

2022-04-01 | GSE190466 | GEO

Role of Chd8 in Xist regulation

Project description:In this project, we have studied the role of Chd8 in Xist regulation and XCI initiation by means of Chd8 Knock-Downs (KD) and Knock-Out (KO).

2021-09-10 | PXD024155 | Pride

shRNAi profiling of huuman CHD8 depleted cells

Project description:CHD8 is a putative chromatin remodeling ATPase of the SNF2 family. We found that depletion of CHD8 impairs cell proliferation. In order to identify CHD8 target genes, we performed a transcriptomic analysis of CHD8-depleted cells. CHD8 was knockdown by doxycyclin-dependent expression of a shRNA that target the CHD8 mRNA. Experiment Overall Design: C33KD2 is a stable cell line where expression of a shRNA, that targets the CHD8 mRNA, is dependent on doxycycline. Addition of doxyclycin provokes a significant reduction in the level of CHD8 protein. Total RNA samples coming from C33KD2 cells cultured for 48 hours either with or without 2 µg/ml doxycycline were used to generate complementary RNA labelled with Cy5 with the Agilent Low RNA Input Fluorescent Linear Amplification Kit (Agilent Technologies). The reference sample was Stratagene human universal reference and was amplified at the same time as the sample RNA using the same method. Reference samples were labeled using Cy3.

2009-05-14 | E-GEOD-11422 | biostudies-arrayexpress

Hemizygous deletion of the autism-associated gene CHD8 impairs synaptic function through widespread changes in gene expression and chromatin compaction

Project description:This SuperSeries is composed of the SubSeries listed below.

2023-07-12 | GSE236994 | GEO

Genes differentially expressed upon CHD8 knockdown

2009-05-01 | GSE11422 | GEO

RNAseq data from ES and differentiated cells in Chd8 WT vs Chd8 KD and Chd8 KO cells

Project description:In this study, we compare the transcriptomic difference between WT and Chd8 depleted ES aand differentiating ES cells. We report significant differences between Chd8 WT and KD/KO cell lines.

2021-04-27 | GSE166858 | GEO

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