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Noncoding RNAs and LRRFIP1 regulate TNF expression.

Lihua Shi1, Li Song, Michael Fitzgerald

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Summary
This summary is machine-generated.

Bidirectional long noncoding RNAs near the TNF gene act as a scaffold for repressor proteins, controlling gene expression. Knockdown released TNF repression, while overexpression induced it.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Biology

Background:

  • Noncoding RNAs (ncRNAs) play roles in gene expression, but mechanisms remain unclear.
  • The TNF gene's regulation involves complex interactions.
  • Specific ncRNAs upstream of TNF were previously uncharacterized.

Purpose of the Study:

  • To identify and characterize long noncoding RNAs (lncRNAs) upstream of the TNF gene.
  • To elucidate the mechanism by which these lncRNAs regulate TNF expression.
  • To investigate the role of repressor proteins in this regulatory pathway.

Main Methods:

  • Identification of bidirectional lncRNAs using five distinct methods.
  • Analysis of repressor protein binding (LRRFIP1, EZH2, SUZ12) to the lncRNA region.
  • Assessment of lncRNA characteristics (polyadenylation, capping, chromatin association).
  • RNA interference (RNAi) for lncRNA knockdown and overexpression studies.
  • Chromatin immunoprecipitation (ChIP) to assess protein binding to chromatin.

Main Results:

  • Bidirectional lncRNAs were identified upstream of the TNF gene in a repressor-binding region.
  • Knockdown of these lncRNAs led to increased TNF mRNA levels and reduced LRRFIP1 binding.
  • Overexpression of lncRNAs decreased TNF expression and promoted repressor recruitment.
  • LRRFIP1 was found to bind directly to the identified lncRNAs.

Conclusions:

  • These lncRNAs function as critical regulators of TNF gene transcription.
  • The lncRNAs act as a platform for assembling a repressive complex, including LRRFIP1.
  • This study reveals a novel mechanism of gene regulation involving lncRNAs and repressor proteins.