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Enhancer-bound LDB1 regulates a corticotrope promoter-pausing repression program.

Feng Zhang1, Bogdan Tanasa2, Daria Merkurjev3

  • 1Howard Hughes Medical Institute and Department of Medicine, School of Medicine, mrosenfeld@ucsd.edu fzhang@ucsd.edu.

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|January 22, 2015
PubMed
Summary

LIM domain-binding protein 1 (LDB1) mediates gene regulation in pituitary cells by orchestrating enhancer-promoter looping. This process controls both gene activation and repression, impacting cell-type determination.

Keywords:
ASCL1LDB1MTA2enhancerlooping

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Enhancers are crucial for cell-type determination by regulating gene transcription.
  • The precise mechanisms of enhancer-promoter interactions in gene activation and repression are not fully understood.

Purpose of the Study:

  • To investigate the role of LIM domain-binding protein 1 (LDB1) in mediating enhancer-promoter looping and gene regulation in corticotrope cells.
  • To elucidate how LDB1 controls both activation and repression of target genes.

Main Methods:

  • Investigated the function of LDB1 and its interacting partners, including cofactor of LIM homeodomain protein 2 and nuclear LIM interactor.
  • Analyzed the role of enhancer-binding protein achaete-scute complex homolog 1 in LDB1-mediated looping.
  • Examined the regulation of transcriptional initiation and promoter pausing in LDB1-dependent gene expression.
  • Assessed the recruitment of metastasis-associated 1 family, member 2 to negative enhancers.

Main Results:

  • LDB1 mediates enhancer-promoter looping essential for regulating target genes in corticotrope cells.
  • LDB1-dependent looping controls both gene activation, at the level of transcriptional initiation, and gene repression.
  • In repression, LDB1 recruits metastasis-associated 1 family, member 2 to negative enhancers, promoting promoter pausing.

Conclusions:

  • LDB1-dependent enhancer-promoter looping is a key mechanism for gene regulation in pituitary cell types.
  • LDB1 can deliver repressive factors to promoters, influencing transcriptional pausing and gene silencing.
  • These findings provide insights into the complex roles of enhancers in cell-type determination and gene control.