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GATA2 regulates GATA1 expression through LSD1-mediated histone modification.

Yidi Guo1, Xueqi Fu1, Bo Huo1

  • 1School of Life Sciences, Jilin University Changchun 130012, China.

American Journal of Translational Research
|June 28, 2016
PubMed
Summary

Lysine-specific demethylase 1 (LSD1) dynamically regulates GATA1 and GATA2 expression during erythroid differentiation. LSD1 represses GATA1 in progenitor cells and GATA2 in differentiated cells through distinct protein complexes.

Keywords:
GATA1GATA2LSD1histone modification

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Area of Science:

  • Hematopoiesis
  • Gene Regulation
  • Epigenetics

Background:

  • GATA1 and GATA2 transcription factors are crucial for erythroid differentiation.
  • Lysine-specific demethylase 1 (LSD1) is implicated in repressing GATA2 during later stages of erythroid development.

Purpose of the Study:

  • To elucidate the mechanism by which LSD1 modulates GATA1 and GATA2 expression during erythroid differentiation.
  • To investigate the dynamic interactions of LSD1 with GATA factors and TAL1.

Main Methods:

  • Western blot, immunoprecipitation, and GST pull-down assays were used to analyze protein expression and interactions.
  • Small interfering RNA (siRNA) was employed for gene knockdown.
  • Double fluorescence immunostaining visualized protein localization.

Main Results:

  • LSD1 knockdown in K562 cells increased H3K4 di-methylation at the GATA1 locus, activating GATA1 expression, indicating LSD1 represses GATA1 via histone demethylation.
  • During erythroid differentiation, LSD1 interaction with GATA2 decreased, correlating with GATA1 de-repression.
  • LSD1 interaction with TAL1 increased, forming a complex that suppressed GATA2 expression.

Conclusions:

  • LSD1 employs distinct mechanisms to regulate GATA1 and GATA2 during erythroid differentiation.
  • In hematopoietic progenitor cells, LSD1 complexes with GATA2 to repress GATA1.
  • In differentiated cells, LSD1 complexes with TAL1 to repress GATA2.