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Opposing LSD1 complexes function in developmental gene activation and repression programmes.

Jianxun Wang1, Kathleen Scully, Xiaoyan Zhu

  • 1Howard Hughes Medical Institute, Department and School of Medicine, University of California, San Diego, 9500 Gilman Drive, Room 345, La Jolla, California 92093-0648, USA.

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|March 30, 2007
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Summary
This summary is machine-generated.

Histone demethylase LSD1 orchestrates gene activation and repression during pituitary development. Its complexes, influenced by ZEB1, regulate cell differentiation and temporal gene expression patterns in organs.

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Area of Science:

  • Epigenetics and developmental biology
  • Molecular mechanisms of gene regulation

Background:

  • Transcriptional control in metazoan development relies on co-regulatory complexes and epigenetic modifications.
  • The precise in vivo roles of histone methyltransferases and demethylases in orchestrating distinct developmental gene programs remain unclear.

Purpose of the Study:

  • To investigate the role of the histone lysine demethylase LSD1 in pituitary organogenesis.
  • To elucidate how LSD1 modulates gene activation and repression programs during late cell-lineage determination and differentiation.

Main Methods:

  • Studied the function of LSD1, a component of the CoREST-CtBP co-repressor complex.
  • Investigated LSD1's recruitment of distinct co-activator or co-repressor complexes.
  • Examined the impact of ZEB1 expression on LSD1-dependent gene repression.

Main Results:

  • LSD1 is essential for late cell-lineage determination and differentiation in the pituitary gland.
  • LSD1 regulates both gene activation and repression programs through distinct complex formations.
  • Induced ZEB1 expression late in development recruits LSD1-containing complexes to repress additional genes, including Gh.

Conclusions:

  • Temporal expression patterns of LSD1 complex components modulate gene regulatory programs during mammalian organ development.
  • LSD1 plays a dynamic role in pituitary organogenesis, switching between activation and repression functions.
  • ZEB1 acts as a key regulator in extending LSD1-mediated gene repression during later developmental stages.