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Physical interaction between MPP8 and PRC1 complex and its implication for regulation of spermatogenesis

Kazuhiro Murata1, Shinya Sato2, Mayumi Haruta1

  • 1Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan.

Biochemical and Biophysical Research Communications
|February 10, 2015
PubMed

Insights

M phase phosphoprotein (MPP8) interacts with Polycomb Repressive Complex 1 (PRC1) to silence genes involved in testis and mesoderm differentiation. MPP8

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Epigenetic modifications like DNA methylation and histone H3 lysine 27 methylation (H3K27me) are crucial for gene silencing.
  • M phase phosphoprotein (MPP8) is implicated in epigenetic regulation due to its association with DNA methylation and histone modification proteins.

Purpose of the Study:

  • To investigate the role of MPP8 in epigenetic regulation, particularly its interaction with repressive pathways.
  • To determine MPP8's function in spermatogenesis and early development.

Main Methods:

  • Immunohistochemical analysis of MPP8 expression in rodent testis.
  • Co-immunoprecipitation to assess MPP8 interaction with Polycomb Repressive Complex 1 (PRC1) components.
  • MPP8 knockdown in HeLa and murine ES cells followed by gene expression analysis.

Main Results:

  • MPP8 is expressed in rodent spermatocytes, suggesting a role in spermatogenesis.
  • MPP8 physically interacts with PRC1, a complex involved in histone modifications (uH2A, H3K27me3).
  • MPP8 depletion in HeLa cells derepressed testis-specific genes, and in ES cells, it induced mesoderm differentiation genes (Cdx2, Brachyury).

Conclusions:

  • MPP8 interacts with PRC1 to silence genes essential for testis and mesoderm differentiation.
  • MPP8 plays a role in repressing differentiation-associated genes during early development and spermatogenesis.
Keywords:
DifferentiationEpigeneticsSpermatocyteTranscription

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