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Chromatin Structure Regulates pre-mRNA Processing02:41

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RNA-Associated Chromatin DNA-DNA Interaction Method
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Interactions between JARID2 and noncoding RNAs regulate PRC2 recruitment to chromatin.

Syuzo Kaneko1, Roberto Bonasio1, Ricardo Saldaña-Meyer1

  • 1Howard Hughes Medical Institute and NYU School of Medicine, Department of Molecular Pharmacology and Biochemistry, New York, NY 10016, USA.

Molecular Cell
|December 31, 2013
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Summary

Long noncoding RNAs (lncRNAs) facilitate Polycomb repressive complex-2 (PRC2) interactions with JARID2, a key protein in embryonic stem cell differentiation. This interaction is crucial for recruiting PRC2 to chromatin, influencing gene silencing during development.

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Molecular Biology

Background:

  • JARID2 is an accessory component of Polycomb repressive complex-2 (PRC2), essential for embryonic stem cell (ESC) differentiation.
  • The precise mechanism by which JARID2 recruits PRC2 to target genes during differentiation remains incompletely understood.

Purpose of the Study:

  • To elucidate the molecular role of JARID2 in PRC2 recruitment to chromatin.
  • To investigate the potential involvement of long noncoding RNAs (lncRNAs) in mediating JARID2-PRC2 interactions.

Main Methods:

  • Identification of a 30-amino-acid region in JARID2 responsible for lncRNA binding.
  • In vitro assays to assess JARID2-EZH2 interactions in the presence of lncRNAs.
  • In vivo chromatin immunoprecipitation (ChIP) assays, including native and crosslinked RNA immunoprecipitation (RIP), to detect lncRNA-JARID2-PRC2 complexes.
  • Analysis of JARID2, PRC2, and H3K27me3 distribution in human induced pluripotent stem cells with and without MEG3 expression.

Main Results:

  • A specific 30-amino-acid region of JARID2 mediates binding to lncRNAs.
  • lncRNAs enhance JARID2-EZH2 interactions in vitro and promote JARID2-mediated PRC2 recruitment to chromatin in vivo.
  • Meg3 and other lncRNAs from the Dlk1-Dio3 locus interact with PRC2 through JARID2.
  • Absence of MEG3 in human induced pluripotent cells leads to altered chromatin localization of JARID2, PRC2, and H3K27me3.

Conclusions:

  • lncRNAs act as crucial facilitators of JARID2-PRC2 interactions on chromatin.
  • This study reveals a novel mechanism by which lncRNAs contribute to the recruitment of PRC2, a key epigenetic regulator, to specific genomic loci.
  • The findings highlight the interplay between lncRNAs, JARID2, and PRC2 in regulating chromatin states during cellular differentiation and development.