Increased expression of Syne1/nesprin-1 facilitates nuclear envelope structure changes in embryonic stem cell differentiation

Elizabeth R. Smith, Xiao Ying Zhang, Callinice D. Capo-Chichi, Xiongwen Chen, Xiang Xi Xu

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We found by electron microscopy that the inter-membrane space of embryonic stem cells is irregular and generally wider than in differentiated cells. Among a panel of nuclear envelope structural proteins examined, the expression of Syne1/nesprin-1 was found to be greatly induced upon differentiation. Down-regulation of Syne1 by siRNA in differentiated embryonic stem cells caused the nuclear envelope to adopt a configuration resembling that found in undifferentiated embryonic stem cells. Suppression of Syne1 expression did not produce a detectable impact on the retinoic acid-induced differentiation of embryonic stem cells; however, forced expression of Syne1 enhanced the tendency of the cells to lose pluripotency. Thus, we found that low expression of Syne1 splicing isoforms accounts for the wider and irregular nuclear envelope inter-membrane space in embryonic stem cells. We conclude that the nuclear envelope structural change accompanying differentiation likely participates in promoting the differential chromatin organization of the differentiated cells.

Original languageEnglish (US)
Pages (from-to)2245-2255
Number of pages11
JournalDevelopmental Dynamics
Volume240
Issue number10
DOIs
StatePublished - Oct 1 2011

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Keywords

  • Embryonic stem cells
  • Mouse blastocysts
  • Nuclear envelope
  • Pluripotency

ASJC Scopus subject areas

  • Developmental Biology

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