Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of mouse wild type and pkd1-/- kidney epithelial cells with and without fluid flow

ABSTRACT: Examining GE profiles in kidney epithelial cells with & without fluid flow

ORGANISM(S): Mus musculus

SUBMITTER: Sheng Xia

PROVIDER: E-TABM-411 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Polycystin-dependent fluid flow sensing targets histone deacetylase 5 to prevent the development of renal cysts.

Xia Sheng S Li Xiaogang X Johnson Teri T Seidel Chris C Wallace Darren P DP Li Rong R

Development (Cambridge, England) 20100224 7

Polycystin 1 and polycystin 2 are large transmembrane proteins, which, when mutated, cause autosomal dominant polycystic kidney disease (ADPKD), a highly prevalent human genetic disease. The polycystins are thought to form a receptor-calcium channel complex in the plasma membrane of renal epithelial cells and elicit a calcium influx in response to mechanical stimulation, such as fluid flow across the apical surface of renal epithelial cells. The functional role of the polycystins in mechanosensa ...[more]

PMID: 20181743

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Project description:Inflammatory responses triggered by either microbial or endogenous stimuli rely on a complex transcriptional program that involves the differential expression of hundreds of genes. Jmjd3, a JmjC family histone demethylase (HDM), is quickly induced by the transcription factor NF-kB in response to inflammatory stimuli. Jmjd3 erases a histone mark associated with transcriptional repression and silencing, trimethylated lysine 27 in histone H3 (H3K27me3). Thus, Jmjd3-mediated demethylation of H3K27me3 links inflammation to the control of a histone modification involved in lineage determination, differentiation and tissue homeostasis. However, the specific contribution of Jmjd3 induction to innate immunity and inflammation remains unknown. Here we combined genome-wide mapping and gene knockout studies to investigate this issue. Chromatin immunoprecipitation (ChIP) coupled to ultra high-throughput sequencing (ChIP-Seq) in LPS-stimulated primary mouse macrophages demonstrated that Jmid3 is recruited to a large number of genomic targets with a strong preference for active transcription start sites (TSS). Virtually all Jmjd3-bound TSSs were characterized by high levels of H3K4me3, a marker of gene activity, and high levels of RNA polymerase II (Pol_II). Inducible genes showing a strong increase in H3K4me3 and Pol_II recruitment after endotoxin treatment (including those encoding several cytokines, chemokines and antiviral proteins) were in most cases Jmjd3-associated. In Jmjd3-knockout macrophages, initial RNA_Pol II recruitment and activation of Jmjd3 target genes was unaffected, but RNA_Pol II was prematurely released, thus resulting in non-sustained responses. Importantly, most Jmjd3 target genes were not associated with detectable levels of H3K27me3, and transcriptional effects of Jmjd3 absence in the window of time analyzed here were uncoupled from measurable effects on this histone mark. Our data indicate that Jmjd3 is the effector of an NF-kB-controlled feed-forward transcriptional loop pervasively sustaining inflammatory transcriptional responses in a manner that is independent of H3K27me3 demethylation, and suggest the possible use of anti-Jmjd3 drugs to dampen pathologic inflammation. Keywords: Epigenetics Genome wide maps of histone demethylase jmjd3, the histone marks H3K4me3 and H3K27me3, and RNA-Polymerase II induction in mouse bone marrow-derived macrophages of two types: (a) untreated and (b) stimulated with lipopolysaccharide and interferon gamma to produce an inflammatory response.

Project description:Several transcription factors are known to be expressed in discrete regions of the otic vesicle and Dlx5 is one of those that is expressed highly in the presumptive dorsal vestibular region. Mice lacking Dlx5 have vestibular defects. Specifically, they fail to form the endolymphatic duct (a defect visible as early as E10) as well as the anterior and posterior semi-circular canals. The lateral canal does form but is smaller, whereas the saccule, the utricle and the cochlea appear relatively normal. The goal of this study was to use microarrays to identify differentially expressed genes between wild-type and Dlx5-null otic vesicles microdissected from E10 and 10.5 and identify downstream targets of Dlx5 by searching the immediate 3kb promoter regions of the differentially expressed genes for homeodomain binding sites followed by chromatin immunoprecipitation in an otic vesicle-derived cell line over-expressing Dlx5. Normal vestibular morphogenesis is compromised in mice lacking Dlx5, a member of the Distal-less family of homeobox transcription factors. We identified its direct downstream targets in the developing mouse inner ear by gene expression profiling wild-type and Dlx5 null otic vesicles from embryonic stages E10 and E10.5. Four hundred genes were differentially expressed in mutants when compared to wild-type in at least one of the two stages. To further constrain the list of likely direct targets of Dlx5, we examined the genomic DNA sequences in the 3kb promoter regions immediately proximal to the transcriptional start sites of these genes. We searched for (i) one or more previously described binding site for Dlx5, (ii) one or more novel 12bp-long motifs with a canonical homeodomain response element (HDRE) shared by promoters of two or more genes, and (iii) 100% conservation of the 12bp-long HDRE-containing motifs in promoter regions of human orthologs. Forty genes passed one or more of these filters, 12 of which are known to be expressed in the developing otic vesicle in domains that at least partially overlap with that of Dlx5 in one or both stages that we examined. Chromatin immunoprecipitation using a Dlx5 antibody confirmed direct binding of Dlx5 to promoter regions of seven of these genes (Atbf1, Bmper, Large, Lrrtm1, and Msx1, all of which were down-regulated in mutants, and Ebf1 and Lhx1, both of which were up-regulated in mutants) in an otic vesicle-derived cell line over-expressing Dlx5. Gene expression profiling of this cell line showed that Bmper and Lrrtm1 transcripts were up-regulated, further supporting their identification as direct targets of Dlx5 activity. Otic vesicles from wild-type and Dlx5-null embryos were microdissected from mouse developmental stages E10 and E10.5 and expression profiled in duplicate for each stage and genotype. Dlx5-transfected and empty vector-transfected 2B1 cell line samples were also profiled in duplicate (independent cell cultures).

Dataset Information

Transcription profiling of mouse wild type and pkd1-/- kidney epithelial cells with and without fluid flow

Publications

Polycystin-dependent fluid flow sensing targets histone deacetylase 5 to prevent the development of renal cysts.

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