TRIM28 Is an Epigenetic Barrier to Induced Pluripotent Stem Cell Reprogramming

详细信息    查看全文

• 作者：Denise Catherine Miles ; Nienke Alexandra de Vries ; Santiago Gisler ; Cor Lieftink ; Waseem Akhtar ; Ewa Gogola ; Inka Pawlitzky ; Danielle Hulsman ; Ellen Tanger ; Martijn Koppens ; et al
• 刊名：STEM CELLS
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：147-157
• 全文大小：968.3KB
• ISSN：1549-4918

文摘

Since the discovery of induced pluripotent stem cells there has been intense interest in understanding the mechanisms that allow a somatic cell to be reprogrammed back to a pluripotent state. Several groups have studied the alterations in gene expression that occur as somatic cells modify their genome to that of an embryonic stem cell. Underpinning many of the gene expression changes are modifications to the epigenetic profile of the associated chromatin. We have used a large-scale shRNA screen to identify epigenetic modifiers that act as barriers to reprogramming. We have uncovered an important role for TRIM28 in cells resisting transition between somatic and pluripotent states. TRIM28 achieves this by maintaining the H3K9me3 repressed state and keeping endogenous retroviruses (ERVs) silenced. We propose that knockdown of TRIM28 during reprogramming results in more plastic H3K9me3 domains, dysregulation of genes nearby H3K9me3 marks, and up regulation of ERVs, thus facilitating the transition through reprogramming. Stem Cells 2017;35:147–157