DNA methylation influences human centromere positioning and function

Area of Science:

• Epigenetics
• Genomics
• Cell Biology

Background:

• Centromeres are critical for genome stability, epigenetically marked by CENP-A.
• Centromeric DNA is characterized by hypomethylated regions within hypermethylated repeats, but its functional role is unclear.

Purpose of the Study:

• To investigate the functional importance of DNA methylation patterns at human centromeres.
• To determine if DNA methylation causally influences CENP-A positioning and centromere function.

Main Methods:

• Development of novel tools to perturb centromeric DNA methylation.
• Analysis of CENP-A localization and centromere architecture following DNA methylation changes.
• Assessment of cellular consequences including aneuploidy and cell viability.

Main Results:

• Perturbing centromeric DNA methylation causally affects CENP-A positioning.
• Rapid DNA demethylation leads to altered centromere architecture, increased protein binding, aneuploidy, and reduced cell viability.
• Gradual DNA demethylation induces cellular adaptation.

Conclusions:

• DNA methylation is a key regulator of CENP-A localization and centromere function.
• These findings provide mechanistic insights into how alterations in centromeric DNA methylation contribute to genome instability and disease.