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Updated: Oct 6, 2025

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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To Degrade or Not to Degrade DNMT3A

Yuhong Ma1, Britta Will2,3

  • 1Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York.

Cancer Discovery
|January 13, 2022
PubMed

Insights

Aberrant DNA methylation, linked to aging and cancer, can be driven by new DNA (cytosine-5-)-methyltransferase 3 alpha (DNMT3A) variants. These variants show reduced activity due to degradation, promoting stem cell expansion.

Area of Science:

  • Epigenetics and Cancer Biology
  • Molecular Mechanisms of Aging
  • Hematopoiesis and Stem Cell Biology

Background:

  • Aberrant DNA cytosine methylation is implicated in aging, impaired tissue regeneration, and cancer development.
  • DNA methyltransferases play crucial roles in establishing and maintaining methylation patterns.
  • Dysregulation of DNA methyltransferases, particularly DNMT3A, is associated with various cancers.

Purpose of the Study:

  • To identify and characterize novel disease-associated variants of DNA (cytosine-5-)-methyltransferase 3 alpha (DNMT3A).
  • To investigate the impact of these variants on de novo DNA methylation activity and protein stability.
  • To determine the role of these DNMT3A variants in the clonal expansion of hematopoietic stem cells.

Main Methods:

  • Variant analysis of DNMT3A in disease contexts.
  • Biochemical assays to measure de novo DNA methylation activity.
  • Assessment of protein stability and proteasomal degradation pathways.
  • In vitro and in vivo studies using hematopoietic stem cells.

Main Results:

  • A new class of DNMT3A variants was identified, associated with disease.
  • These variants exhibit significantly decreased de novo DNA methylation activity.
  • Increased proteasomal degradation of these variants was observed, leading to reduced protein levels.
  • The identified DNMT3A variants promote the clonal expansion of hematopoietic stem cells.

Conclusions:

  • Novel DNMT3A variants contribute to disease pathogenesis through impaired DNA methylation and stem cell expansion.
  • Proteasomal degradation is a key mechanism regulating the activity of these disease-associated DNMT3A variants.
  • Targeting DNMT3A stability or activity may offer therapeutic strategies for age-related diseases and cancers.

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