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EPOP restricts PRC2.1 targeting to chromatin by directly modulating enzyme complex dimerization.

Lihu Gong1,2,3,4, Xiuli Liu1,2,3, Xin Yang1,2,3

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EPOP protein inhibits Polycomb Repressive Complex 2.1 (PRC2.1) by disrupting its dimer formation, weakening chromatin binding. This regulation is crucial for maintaining epigenetic programs during early cell differentiation.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Polycomb Repressive Complex 2 (PRC2) is essential for developmental gene repression.
  • PRC2 exists as PRC2.1 and PRC2.2 holocomplexes.
  • EPOP is a PRC2.1-specific subunit with a proposed inhibitory role.

Purpose of the Study:

  • To elucidate the molecular mechanism of EPOP's regulation of PRC2.1.
  • To investigate the role of EPOP-Elongin BC interaction in PRC2.1 inhibition.
  • To understand EPOP's function in maintaining epigenetic programs during differentiation.

Main Methods:

  • Investigated EPOP's effect on PRC2.1 oligomerization state.
  • Assessed PRC2.1 chromatin association.
  • Utilized an EPOP mutant defective in PRC2 binding in mouse epiblast-like cells.
  • Examined the role of Elongin BC in EPOP-mediated inhibition.

Main Results:

  • EPOP directly modulates PRC2.1 oligomerization, disrupting the dimer.
  • EPOP weakens PRC2.1 chromatin association by disabling the avidity effect.
  • Elongin BC is largely dispensable for EPOP's inhibitory function.
  • An EPOP mutant enhanced genome-wide MTF2 enrichments, indicating reduced PRC2.1 activity.

Conclusions:

  • EPOP inhibits PRC2.1 by modulating its oligomerization and chromatin binding.
  • EPOP defines a unique PRC2.1 subclass important for epigenetic regulation.
  • This mechanism prevents over-repression of key developmental regulators during differentiation.