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Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
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Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome

Published on: June 15, 2016

Cis-regulation of microRNA expression by scaffold/matrix-attachment regions

Pavithra Lakshminarasimhan Chavali1, Keiko Funa, Sreenivas Chavali

  • 1Institute of Biomedicine, Cancer Center Sahlgrenska, University of Gothenburg, Medicinaregatan, Sweden.

Nucleic Acids Research
|May 19, 2011
PubMed

Insights

Matrix-attachment regions (MARs) regulate microRNA (miRNA) gene expression in a cell-specific manner. MARs tether chromatin to the nuclear matrix, controlling miRNA expression in neuroblastoma cells.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are crucial regulators of gene expression.
  • The mechanisms governing miRNA gene expression, particularly cell-type specificity, remain largely unknown.
  • Cis-regulatory elements like scaffold/matrix-attachment regions (MARs) are known regulators of gene expression.

Purpose of the Study:

  • To investigate the role of MARs in modulating miRNA gene expression.
  • To determine if MARs contribute to the cell type-specific expression of miRNAs, focusing on neuroblastoma.

Main Methods:

  • Bioinformatic analysis to identify MAR enrichment in miRNA upstream regions.
  • Experimental validation of MAR function in neuroblastoma and fibroblast cells.
  • Assessing the binding of High Mobility Group protein I/Y (HMG I/Y) to MARs and its effect on chromatin structure and gene activation.

Main Results:

  • MARs are significantly enriched in the upstream regions of miRNA genes.
  • MARs mediate cell type-specific miRNA expression by tethering chromatin to the nuclear matrix.
  • HMG I/Y protein binding to MARs in neuroblastoma cells, but not fibroblasts, leads to histone acetylation and gene activation, functioning as boundary elements.

Conclusions:

  • MARs play a critical role in the cell type-specific transcriptional regulation of miRNA genes.
  • The interaction of MARs with specific binding proteins, like HMG I/Y, dictates tissue/context-specific miRNA gene activation.
  • This mechanism highlights MARs as key regulators controlling miRNA expression patterns in diseases like neuroblastoma.

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