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Centromere epigenetic memory is established after an embryonic plastic phase. This phase relies on maternal genotype and DNA, limiting weakened centromeres to one generation and minimizing epigenetic differences.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • Centromeres are epigenetically defined by CENP-A nucleosomes, crucial for chromosome segregation.
  • The propagation of CENP-A is thought to create epigenetic memory, maintaining centromere identity.
  • Weakened centromeres pose a challenge to faithful inheritance and epigenetic stability.

Purpose of the Study:

  • To investigate the role of CENP-A assembly in centromere epigenetic memory.
  • To determine the influence of maternal genotype and centromeric DNA on CENP-A inheritance.
  • To understand how centromere weakening is managed across generations.

Main Methods:

  • Utilized a mouse model with reduced CENP-A nucleosome levels.
  • Analyzed CENP-A assembly during embryonic development.
  • Assessed the impact of maternal Cenpa genotype and centromeric DNA repeat abundance.

Main Results:

  • Identified an embryonic plastic phase preceding stable epigenetic memory.
  • Nascent CENP-A assembly during this phase depends on maternal genotype and DNA, not pre-existing templates.
  • Weakened centromeres are limited to one generation, with parental epigenetic differences erased unless DNA repeat abundance differs.

Conclusions:

  • Centromere inheritance involves a maternal effect and DNA-dependent assembly during a plastic embryonic phase.
  • This mechanism limits the persistence of weakened centromeres and parental epigenetic variations.
  • The findings suggest a strategy to minimize fitness costs associated with centromeric epigenetic instability.