Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

BRG1 recruitment by transcription factors MITF and SOX10 defines a specific configuration of regulatory elements in the melanocyte lineage (ChIP-seq)

ABSTRACT: Microphthalmia-associated transcription factor (MITF) is the master regulator of the melanocyte lineage. By tandem affinity purification and mass spectrometry, we present a comprehensive characterisation of the MITF interactome comprising multiple novel cofactors involved in transcription, DNA replication and repair and chromatin organisation, including a BRG1 chromatin remodelling complex comprising CHD7. BRG1 is essential for melanoma cell proliferation in vitro and for normal melanocyte development in vivo. MITF and SOX10 actively recruit BRG1 to a set of MITF-associated regulatory elements (MAREs) at active enhancers. MITF, SOX10 and YY1 bind between two BRG1-occupied nucleosomes thus defining both a combinatorial signature of transcription factors essential for the melanocyte lineage and a specific chromatin organisation of MAREs. Nevertheless, BRG1 silencing enhances MITF occupancy at MAREs showing that BRG1 acts to promote dynamic MITF interactions with chromatin. 8 samples corresponding to genomic occupancy profiling of MITF, SOX10, BRG1 after si-control, BRG1 after si-MITF and BRG1 after siSOX10; and their respective controls (MITF Input, SOX10 Input, GFP-siCTRL ChIPseq) in 501Mel cells.

ORGANISM(S): Homo sapiens

SUBMITTER: Patrick Laurette

PROVIDER: E-GEOD-61965 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Transcription factor MITF and remodeller BRG1 define chromatin organisation at regulatory elements in melanoma cells.

Laurette Patrick P Strub Thomas T Koludrovic Dana D Keime Céline C Le Gras Stéphanie S Seberg Hannah H Van Otterloo Eric E Imrichova Hana H Siddaway Robert R Aerts Stein S Cornell Robert A RA Mengus Gabrielle G Davidson Irwin I

eLife 20150324

Microphthalmia-associated transcription factor (MITF) is the master regulator of the melanocyte lineage. To understand how MITF regulates transcription, we used tandem affinity purification and mass spectrometry to define a comprehensive MITF interactome identifying novel cofactors involved in transcription, DNA replication and repair, and chromatin organisation. We show that MITF interacts with a PBAF chromatin remodelling complex comprising BRG1 and CHD7. BRG1 is essential for melanoma cell pr ...[more]

PMID: 25803486

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Project description:Gene expression profiling of tissues derived from different genetic backgrounds can provide insight to potential phenotype-related changes in gene expression. We have compared wildtype C57BL/6 (melan-Ink4a) melanocyte cell gene expression to that of, âbrownâ Tyrp1b/ b (melan-Ink4a-b) and âchocolateâ Rab38 cht/cht (melan-cht) melanocyte derived lines. We observed alterations in gene expression consistent with a physiological response of melan-Ink4a-b cells to endoplasmic reticulum protein-folding impairment. Additionally, a set of loci was identified that are expressed in a similar manner to known melanocyte genes. Importantly, the collection of 254 genes is enriched for expression in the multiple melanocyte lines relative to control cell populations. This set contains Tyr, Tyrp1, Dct, Si, Melna, Slc24a5, Slc45a2, Slc24a4, Mitf, and Sox10, in addition to genes not previously attributed to pigmentation and genes with unknown function. Further evaluation of one gene in this cohort, Gpnmb, demonstrated an expression pattern similar to Dct, Si and Mitf. This expression is vastly reduced in MitfMi mutants embryos, indicating that it is dependent on Mitf for in vivo expression. Consistent with this notion, a highly-conserved MITF binding site resides directly upstream of human GPNMB, and deletion of this sequence dramatically reduces in vitro enhancer activity. Keywords: NIH embryo fibroblast cell line, melanocyte cell line, Ink4a, Tyrp1b, Rab38 A 32k expression arrays were generated by printing Oligo nucleotides from Operon Mouse oligo set (MV3) onto epoxy slides. Total RNA from immortalized melanocyte cell lines derived from C57BL/6J Ink4a-/- (melan-Ink4a-1), C57BL/6J Ink4a-/-; Tyrp1b/b (melan-Ink4a-b) and 2 separate C57BL/6J Ink4a-/-; RaB38cht/cht lines (melan-cht4), (melan-cht5) and NIH3T3 were labeled with Cy5/3 and co-hybridized with a total RNA universal reference (Stratagene, Inc) labeled with Cy3/5. Each comparison was done in Triplicate including one dye swap.

Dataset Information

BRG1 recruitment by transcription factors MITF and SOX10 defines a specific configuration of regulatory elements in the melanocyte lineage (ChIP-seq)

Publications

Transcription factor MITF and remodeller BRG1 define chromatin organisation at regulatory elements in melanoma cells.

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