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An epigenetic clock for Xenopus tropicalis.

Ronan Bennett1, Marco Morselli2, Kseniya Petrova3

  • 1Bioinformatics Interdepartmental Program, University of California Los Angeles, Los Angeles, CA, USA.

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|May 22, 2025
PubMed
Summary

Scientists developed a DNA methylation clock for Xenopus tropicalis frogs, enabling new aging research in amphibians. This epigenetic clock reveals conserved aging mechanisms between frogs and mammals.

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Area of Science:

  • Comparative genomics
  • Epigenetics
  • Developmental biology

Background:

  • DNA methylation clocks are crucial for age prediction, primarily studied in mammals.
  • Xenopus tropicalis is a key model organism in developmental and genomic research.
  • Understanding epigenetic aging in non-mammalian vertebrates is limited.

Purpose of the Study:

  • To develop the first epigenetic clock for the frog Xenopus tropicalis.
  • To investigate the epigenetic features associated with aging in amphibians.
  • To explore the evolutionary conservation of epigenetic aging mechanisms.

Main Methods:

  • Collected DNA methylation data from 192 Xenopus tropicalis frogs.
  • Utilized targeted bisulfite sequencing at CpG sites.
  • Analyzed age-associated methylation patterns in relation to chromatin marks (H4K20me3, H3K9me3, H3K36me3) and gene expression.

Main Results:

  • Developed a robust epigenetic clock for Xenopus tropicalis age prediction.
  • Identified age-correlated CpG sites enriched in heterochromatic regions (H4K20me3, H3K9me3).
  • Found positively age-correlated CpGs associated with bivalent chromatin, H3K36me3, and lowly expressed genes, mirroring mammalian patterns.

Conclusions:

  • The Xenopus tropicalis epigenetic clock facilitates novel aging research in amphibians.
  • Epigenetic aging mechanisms show evolutionary conservation between amphibians and mammals.
  • This study expands the utility of DNA methylation clocks across vertebrate species.