Abstract:
:Menin, encoded by the multiple endocrine neoplasia type 1 (MEN1) gene, is a tumor suppressor that leads to multiple endocrine tumors upon loss of its function. Menin functions as a transcriptional activator by tethering MLL complex to mediate histone H3 K4 methylation. It also functions as a repressor. However, the molecular mechanism of how menin contributes to the opposite outcome in gene expression is largely unknown. Here, we investigated the role of menin in the epigenetic regulation of transcription mediated by histone covalent modification. We show that the global methylation level of histone H3 K9, as well as H3 K4, was decreased in Men1(-/-) MEF cells. Consistently, menin was able to interact with the suppressor of variegation 3-9 homolog family protein, SUV39H1, to mediate H3 K9 methylation. This interaction decreased when patient-derived MEN1 mutation was introduced into the SUV39H1-interaction domain. We show that menin mediated different chromatin changes depending on target genes. Chromatin immunoprecipitation studies showed that menin directly associated with the GBX2 promoter and menin-dependent recruitment of SUV39H1 was essential for chromatin remodeling and transcriptional regulation. These results provide a molecular basis of how menin functions as a transcriptional repressor and suggest that menin-dependent integration of H3 K9 methylation might play an important role in preventing tumors.
journal_name
Cell Death Disjournal_title
Cell death & diseaseauthors
Yang YJ,Song TY,Park J,Lee J,Lim J,Jang H,Kim YN,Yang JH,Song Y,Choi A,Lee HY,Jo CH,Han JW,Kim ST,Youn HD,Cho EJdoi
10.1038/cddis.2013.98subject
Has Abstractpub_date
2013-04-11 00:00:00pages
e583issn
2041-4889pii
cddis201398journal_volume
4pub_type
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