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Differential roles of Sall4 isoforms in ES cell pluripotency

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE21056 | GEO | 2010/09/13

SECONDARY ACCESSION(S): PRJNA126441

REPOSITORIES: GEO

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Differential roles of Sall4 isoforms in ES cell pluripotency

Project description:This SuperSeries is composed of the following subset Series: GSE21054: Differential roles of Sall4 isoforms in ES cell pluripotency: expression GSE21055: Differential Role of Sall4 isoforms in ES cell pluripotency: ChIP-chip Refer to individual Series

2010-09-13 | E-GEOD-21056 | biostudies-arrayexpress

Differential roles of Sall4 isoforms in embryonic stem cell pluripotency.

Project description:Murine embryonic stem (ES) cells are defined by continuous self-renewal and pluripotency. A diverse repertoire of protein isoforms arising from alternative splicing is expressed in ES cells without defined biological roles. Sall4, a transcription factor essential for pluripotency, exists as two isoforms (Sall4a and Sall4b). Both isoforms can form homodimers and a heterodimer with each other, and each can interact with Nanog. By genomewide location analysis, we determined that Sall4a and Sall4b have overlapping, but not identical binding sites within the ES cell genome. In addition, Sall4b, but not Sall4a, binds preferentially to highly expressed loci in ES cells. Sall4a and Sall4b binding sites are distinguished by both epigenetic marks at target loci and their clustering with binding sites of other pluripotency factors. When ES cells expressing a single isoform of Sall4 are generated, Sall4b alone could maintain the pluripotent state, although it could not completely suppress all differentiation markers. Sall4a and Sall4b collaborate in maintenance of the pluripotent state but play distinct roles. Our work is novel in establishing such isoform-specific differences in ES cells.

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Differential roles of Sall4 isoforms in ES cell pluripotency: expression

Project description:Murine embryonic stem cells (ESCs) are defined by continuous self-renewal and pluripotency. A diverse repertoire of protein isoforms arising from alternative splicing are expressed in ES cells without defined biological roles. Sall4, a transcription factor essential for pluripotency, exists as two isoforms (Sall4a and Sall4b). By genome-wide location analysis, we have determined that Sall4b, and not Sall4a, binds preferentially to highly expressed loci in ES cells. Sall4a and Sall4b binding sites are distinguished by both epigenetic marks at target loci and their clustering with binding sites of other pluripotency factors. When ESCs expressing a single isoform of Sall4 are generated, Sall4b alone could maintain the pluripotent state, although it could not completely suppress all differentiation markers. Sall4a and Sall4b collaborate in maintenance of the pluripotent state, but play distinct roles. Our work is novel in establishing such isoform-specific differences in ES cells.

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