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AS002

ABSTRACT: A novel MITF variant in a white American Standardbred foal

PROVIDER: PRJEB14651 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	horses.88.vars.flt.pass.ebi.vcf.gz	Vcf
	horses.88.vars.flt.pass.ebi.vcf.gz.tbi	Vcf
	ERR1512897.fastq.gz	Fastqsanger.gz
	ERR1512897_1.fastq.gz	Fastqsanger.gz
	ERR1512897_2.fastq.gz	Fastqsanger.gz

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Project description:The lysosomal function is down-regulated in the white prepupal fat body, resulting in the enlargement of lysosomes in the tissue. The enlargement is blocked by the forced activation of lysosomes by the overexpression of mitf, a sole homolog of the MiTF/TFE family transcription factors. Thus, it is possible to speculate that mitf participates in the down-regulation of lysosomes in the fat body. To test this possibility, we performed a comparative mRNA-seq of (1) wild-type white prepupal fat body, (2) mitf overexpressed white prepupal fat body, and (3) wild-type third instar larval fat body. First, a comparison of (1) and (2) showed that the overexpression of mitf upregulated transcription of most of the lysosome-related genes in the fat body, consistent with previous studies. Next, a comparison of (1) and (3) indicated that the transcription level of several lysosome-related genes was decreased in (1) compared to (3). However, most of the genes regulated by Mitf were not transcriptionally affected. These results suggest that mitf is dispensable for the downregulation of lysosomes in the white prepupal fat body.

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

Project description: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.

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