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Differential gene expression between wild type and Pax9-null pharyngeal arch tissue

ABSTRACT: Differential gene expression between wild type and Pax9-null pharyngeal arch tissue

PROVIDER: PRJNA526373 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8706270_1.fastq.gz	Fastqsanger.gz
	SRR8706270_2.fastq.gz	Fastqsanger.gz
	SRR8706271_1.fastq.gz	Fastqsanger.gz
	SRR8706271_2.fastq.gz	Fastqsanger.gz
	SRR8706272_1.fastq.gz	Fastqsanger.gz

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Differential gene expression between wild type and Pax9-null pharyngeal arch tissue

Project description:The aim of this study was to identify differentially expressed genes within the pharyngeal arches of Pax9-null embryos at E9.5. Mice null for Pax9 die in the neonatal period with complex cardiovascular defects, caused by abnormal morphogenesis of the pharyngeal arch arteries.

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Analysis of gene expression in the mouse embryo pharyngeal arch

Project description:This study was conducted to examine normal gene expression in the pharyngeal arch during mouse embryonic development

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Analysis of gene expression in the mouse embryo pharyngeal arch

Project description:This study was conducted to examine normal gene expression in the pharyngeal arch during mouse embryonic development Wild type embryonic tissue containing the pharyngeal arches was collected from five independent samples (n=5) at stage E10.5 by dissection. Total RNA was isolated for analysis by Affymetrix mouse genome 430A GeneChip.

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scRNA-seq timeline of first pharyngeal arch migratory stream in zebrafish

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Pax9 is required for cardiovascular development and interacts with Tbx1 in the pharyngeal endoderm to control 4th pharyngeal arch artery morphogenesis.

Project description:Developmental defects affecting the heart and aortic arch arteries are a significant phenotype observed in individuals with 22q11 deletion syndrome and are caused by a microdeletion on chromosome 22q11. TBX1, one of the deleted genes, is expressed throughout the pharyngeal arches and is considered a key gene, when mutated, for the arch artery defects. Pax9 is expressed in the pharyngeal endoderm and is downregulated in Tbx1 mutant mice. We show here that Pax9-deficient mice are born with complex cardiovascular malformations that affect the outflow tract and aortic arch arteries with failure of the 3rd and 4th pharyngeal arch arteries to form correctly. Transcriptome analysis indicated that Pax9 and Tbx1 may function together, and mice double heterozygous for Tbx1/Pax9 presented with a significantly increased incidence of interrupted aortic arch when compared with Tbx1 heterozygous mice. Using a novel Pax9Cre allele, we demonstrated that the site of this Tbx1-Pax9 genetic interaction is the pharyngeal endoderm, therefore revealing that a Tbx1-Pax9-controlled signalling mechanism emanating from the pharyngeal endoderm is required for crucial tissue interactions during normal morphogenesis of the pharyngeal arch artery system.

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A Developmental Genomic Analysis of Pax1 and Pax9 in Embryonic Intervertebral Disc Development

Project description:Pax1 and Pax9 play redundant, synergistic functions in the patterning and differentiation of the sclerotomal cells that give rise to the vertebral bodies and intervertebral discs (IVD) of the axial skeleton. Gene expression profiling of an enriched population of Pax1/Pax9-expressing cells of the embryonic IVD revealed that Pax1 and Pax9 regulate cell proliferation, cartilage development, collagen fibrillogenesis and other processes vital in early IVD morphogenesis. Twenty-nine of the Pax1/Pax9 targets are also associated with axial skeletal defects that phenocopy Pax1/Pax9-deficient mice. Pax1 likely auto-regulates itself and is up-regulated in the absence of Pax9, clarifying how it compensates for the loss of Pax9, while Pax9 is unaffected by the loss of Pax1. Pax1 and Pax9 positively regulate several of the cartilage development genes known to be regulated by the “Sox trio” (Sox5/Sox6/Sox9).

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Arch amoA

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Single-cell transcriptomics of mouse wildtype and Hoxa2-/- pharyngeal arches 1 and 2 at E10.5.

Project description:The Hox genes play a key role in specifying the axial identity of neural crest cells (NCCs) migrating into the pharyngeal arches of the developing mouse embryo. In the absence of Hoxa2, NCC derivatives of the second pharyngeal arch (PA2) duplicate those formed by NCCs of the first arch (PA1). In this study, we use bulk and single-cell RNAseq to establish the molecular mechanisms driving this phenotypic reversion to a ground state. Comparing the transcriptomes of PA1 and PA2 in wildtype and Hoxa2-/- embryos during NCC migration and differentiation, we find that Hoxa2-/- PA2 does not revert to a molecular ‘ground state’ corresponding to the NCC derivatives. This separation of phenotypic and molecular states has significant implications for our understanding of NCC biology. We also identify putative targets through which HOXA2 likely acts to impart PA2 identity. The heterogenous expression of these targets within the PAs and their responses to the absence of HOXA2 suggest that subsets of NCCs may respond to HOXA2 activity in distinct manners related to their ultimate fate. To understand the heterogeneity of neural crest cells (NCCs) and other tissues of pharyngeal arches (PAs) 1 and 2 in the mouse embryo at E10.5, during NCC differentiation, we collected PA1 and PA2 from wildtype embryos and Hoxa2-/- embryos. We used the 10x Chromium single-cell sequencing system to compare the transcriptional profiles between PA1 and PA2 as well as wildtype and Hoxa2-/- PAs.

2021-02-09 | GSE164108 | GEO

PAX9 determines epigenetic state transition and cell fate in small cell lung cancer

Project description:Small cell lung cancer (SCLC) is a more aggressive and deadlier form of lung cancer with limited effective therapies currently available. By utilizing a genome-wide CRISPR-Cas9 dropout screen, we have identified the Paired box protein 9 (PAX9) as an essential factor for the cell viability of SCLC-A type, which accounts for approximately 70% of all SCLC. PAX9 is transcriptionally driven by the BAP1/ASXL3/BRD4 epigenetic axis and is overexpressed in human malignant SCLC tumor samples. Genome-wide studies have revealed that PAX9 occupies distal enhancer elements and represses gene expression by restricting enhancer activity. Genetic depletion of PAX9 leads to a dramatic induction of a primed-active enhancer transition, resulting in an increased expression of a large number of neural differentiation and tumor-suppressive genes in multiple SCLC cell lines. Mechanistically, PAX9 interacts and co-functions with the Nucleosome Remodeling and Deacetylase (NuRD) complex at enhancers and they repress the nearby gene expression, which could be rescued by pharmacological HDAC inhibition. Overall, this study provides mechanistic insight into the oncogenic function of the PAX9/NuRD complex epigenetic axis in human SCLC and suggests that re-activation of the primed enhancers may have therapeutic efficacy in treating SCLC-A type cancers expressing high levels of PAX9.

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