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Associated Chromosome Trap for Identifying Long-range DNA Interactions
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Boundary Associated Long Noncoding RNA Mediates Long-Range Chromosomal Interactions.

Ifeoma Jane Nwigwe1, Yoon Jung Kim2, David A Wacker3

  • 1Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CT, 06520, United States of America.

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|August 25, 2015
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Summary

The CCCTC binding factor (CTCF) boundary element CBS5 at the HOXA locus generates a long noncoding RNA (lncRNA) that stabilizes gene interactions. This lncRNA, along with CTCF-Cohesin, maintains topologically associated domains for proper gene expression.

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Area of Science:

  • * Molecular Biology
  • * Genomics
  • * Epigenetics

Background:

  • * CCCTC binding factor (CTCF) and Cohesin are crucial for organizing chromosomes into topologically associated domains (TADs).
  • * CTCF-Cohesin interactions are vital for transcription insulation and proper gene expression.
  • * The precise mechanisms underlying TAD formation and the role of CTCF-independent factors remain under investigation.

Purpose of the Study:

  • * To investigate the functional role of a specific CTCF binding site (CBS5) at the HOXA locus.
  • * To determine if CBS5 possesses promoter activity and generates noncoding RNA.
  • * To elucidate the mechanisms by which CBS5 and its associated RNA contribute to TAD organization and gene regulation at the HOXA locus.

Main Methods:

  • * Identification and characterization of a novel long noncoding RNA (lncRNA), blncRNA1, transcribed from the CBS5 boundary element.
  • * Functional analysis of blncRNA1's role in stabilizing long-range interactions and regulating HOXA gene expression.
  • * Investigation of the interplay between blncRNA1, CTCF, and Cohesin in maintaining TADs.

Main Results:

  • * The CTCF binding site 5 (CBS5) at the HOXA locus exhibits promoter activity, generating blncRNA1.
  • * blncRNA1 actively stabilizes long-range interactions within the HOXA locus, promoting correct HOXA gene expression.
  • * While blncRNA1 is essential for stabilizing interactions, it is not required for CTCF-Cohesin complex stabilization; however, CTCF-Cohesin is critical for blncRNA1 transcription.

Conclusions:

  • * The CBS5 boundary element utilizes a dual mechanism involving both Cohesin and blncRNA1 to establish and maintain TADs at the HOXA locus.
  • * blncRNA1 represents a novel noncoding RNA involved in epigenetic regulation and genome organization.
  • * These findings reveal a complex regulatory network at the HOXA locus involving CTCF, Cohesin, and lncRNAs in maintaining higher-order chromatin structure and gene expression.