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M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity (ATAC-seq)

ABSTRACT: M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity (ATAC-seq)

PROVIDER: PRJNA715215 | ENA |

REPOSITORIES: ENA

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M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity

Project description:Genome organization is driven by forces affecting transcriptional state, but the relationship between transcription and genome architecture remains unclear. Here, we identified the Drosophila transcription factor Motif 1 Binding Protein (M1BP) in physical association with the gypsy chromatin insulator core complex, including the universal insulator protein CP190. M1BP is required for enhancer-blocking and barrier activities of the gypsy insulator as well as its proper nuclear localization. Genome-wide, M1BP specifically colocalizes with CP190 at Motif 1-containing promoters, which are enriched at topologically associating domain (TAD) borders. M1BP facilitates CP190 chromatin binding at many shared sites and vice versa. Both factors promote Motif 1-dependent gene expression and transcription near TAD borders genome-wide. Finally, loss of M1BP reduces chromatin accessibility and increases both inter- and intra-TAD local genome compaction. Our results reveal physical and functional interaction between CP190 and M1BP to activate transcription at TAD borders and mediate chromatin insulator-dependent genome organization.

2021-06-07 | PXD026497 | Pride

M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity (ATAC-seq)

Project description:Genome organization is driven by forces affecting transcriptional state, but the relationship between transcription and genome architecture remains unclear. Here, we identified the Drosophila transcription factor Motif 1 Binding Protein (M1BP) in physical association with the gypsy chromatin insulator core complex, including the universal insulator protein CP190. M1BP is required for enhancer-blocking and barrier activities of the gypsy insulator as well as its proper nuclear localization. Genome-wide, M1BP specifically colocalizes with CP190 at Motif 1-containing promoters, which are enriched at topologically associating domain (TAD) borders. M1BP is required for CP190 chromatin binding at many shared sites, and CP190 also affects M1BP chromatin association. Both factors are required for Motif 1-dependent gene expression and transcription near TAD borders genome-wide. Finally, loss of M1BP alters local genome compaction. Our results reveal physical and functional interaction between CP190 and M1BP to activate transcription at TAD borders and mediate chromatin insulator-dependent genome organization.

2021-04-14 | GSE169105 | GEO

M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity

Project description:In order to identify more gypsy insulator interactors, we performed immunoaffinity purification of Drosophila embryonic nuclear extracts using antibodies specific for CP190 and analyzed the eluates using quantitative mass spectrometry.

2021-06-07 | PXD026493 | Pride

The transcription factor M1BP targets CP190 to chromatin to regulate transcription and chromatin insulator activity (RNA-Seq)

Project description:Chromatin insulators are DNA-protein complexes that establish distinct higher order transcriptional domains. In Drosophila, CP190 is the only common factor for all the DNA-binding insulator protein complex. Insulators harbour two properties: they can block communication between an enhancer and a promoter, and also act as a barrier between heterochromatin and euchromatin. In Drosophila, the gypsy insulator complex contains three core components; Su(Hw), CP190 and Mod(mdg4)67.2. In our studies, using mass-spec analysis and of immunopurified complexes from Drosophila embryonic nuclear extracts, we identified the transcription factor Motif 1 Binding Protein (M1BP) associated with CP190 and verified this interaction by coimmunoprecipitation. Furthermore, depletion of M1BP results in loss of both enhancer-blocking and barrier activities, also disrupts the nuclear localization of CP190-marked insulator bodies within the developing fly. ChIP-seq analysis of both factors in Kc167 cultured hemocytes revealed extensive overlap of the two factors, particularly at Motif 1 containing promoters. Depletion of M1BP results in extensive loss of CP190 chromatin association, and depletion of CP190 also greatly affects M1BP chromatin association. Moreover, EU-seq analysis after depletion of either CP190 or M1BP suggests they regulate gene expression in similar fashion. Further analysis using reporter assays verifies that CP190-dependent gene expression changes are dependent on the presence of Motif 1. Our results suggest a novel mechanistic relationship between CP190 and M1BP function with respect to transcriptional regulation and higher order chromatin organization.

2020-10-27 | GSE142532 | GEO

The transcription factor M1BP targets CP190 to chromatin to regulate transcription and chromatin insulator activity (ChIP-Seq)

2020-10-27 | GSE142531 | GEO

M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity.

Project description: Not available

| S-EPMC8263732 | biostudies-literature

The transcription factor M1BP targets CP190 to chromatin to regulate transcription and chromatin insulator activity

Project description:The transcription factor M1BP targets CP190 to chromatin to regulate transcription and chromatin insulator activity

| PRJNA597330 | ENA

Topological screen identifies hundreds of Cp190 and CTCF dependent Drosophila chromatin insulator elements [HiC]

Project description:CTCF and Cp190 proteins are implicated at many insulator elements throughout Drosophila genome. Here we compared Hi-C maps, transcriptomes and binding of multiple insulator proteins in cultured Drosophila cells derived from CTCF-KO, Cp190-KO and control embryos.

2022-07-19 | GSE198760 | GEO

Topological screen identifies hundreds of Cp190 and CTCF dependent Drosophila chromatin insulator elements [RNA-seq]

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Topological screen identifies hundreds of Cp190 and CTCF dependent Drosophila chromatin insulator elements [ChIP-seq]

2022-07-19 | GSE198762 | GEO