H3K4 Methyltransferase Set1a Is A Key Oct4 Coactivator Essential for Generation of Oct4 Positive Inner Cell Mass

Stem Cells
Lan FangJiemin Wong

Abstract

Limited core transcription factors and transcriptional cofactors have been shown to govern embryonic stem cell (ESC) transcriptional circuitry and pluripotency, but the molecular interactions between the core transcription factors and cofactors remains ill defined. Here, we analyzed the protein-protein interactions between Oct4, Sox2, Klf4, and Myc (abbreviated as OSKM) and a large panel of cofactors. The data reveal both specific and common interactions between OSKM and cofactors. We found that among the SET1/MLL family H3K4 methyltransferases, Set1a specifically interacts with Oct4 and this interaction is independent of Wdr5. Set1a is recruited to and required for H3K4 methylation at the Oct4 target gene promoters and transcriptional activation of Oct4 target genes in ESCs, and consistently Set1a is required for ESC maintenance and induced pluripotent stem cell generation. Gene expression profiling and chromatin immunoprecipitation-seq analyses demonstrate the broad involvement of Set1a in Oct4 transcription circuitry and strong enrichment at TSS sites. Gene knockout study demonstrates that Set1a is not only required for mouse early embryonic development but also for the generation of Oct4-positive inner cell mass. Together o...Continue Reading

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Sep 21, 2016·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Andreia M SilvaSusana G Santos
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