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Updated: Jun 22, 2025

Sample Preparation to Bioinformatics Analysis of DNA Methylation: Association Strategy for Obesity and Related Trait Studies
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Genome-wide Methylation Dynamics and Context-dependent Gene Expression Variability in Differentiating Preadipocytes.

Binduma Yadav1,2, Dalwinder Singh1,3, Shrikant Mantri1

  • 1Nutritional Biotechnology, National Agri-Food Biotechnology Institute, Mohali, Punjab 140306, India.

Journal of the Endocrine Society
|July 5, 2024
PubMed
Summary

DNA methylation patterns change during preadipocyte differentiation. While global methylation remains similar, specific "hotspots" show dynamic changes, influencing gene expression and adipogenesis.

Keywords:
3T3-L1DNA methylationWhole Genome Bisulphite Sequencingand adipogenesiscontext-dependent gene expressiondifferentially methylated regionshotspotsobesity

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Area of Science:

  • Epigenetics
  • Cell Biology
  • Genomics

Background:

  • Obesity is a complex condition influenced by genetic and epigenetic factors.
  • DNA methylation is implicated in cell differentiation and fate determination.
  • The precise mechanisms of preadipocyte terminal differentiation remain incompletely understood.

Purpose of the Study:

  • To investigate dynamic genome-wide DNA methylation changes during 3T3 L1 preadipocyte differentiation.
  • To identify differentially methylated regions (DMRs) and regulatory elements involved in adipogenesis.
  • To explore the relationship between DNA methylation and gene expression in differentiating adipocytes.

Main Methods:

  • Whole-genome bisulfite sequencing (WGBS) was used to analyze DNA methylation at single-base resolution.
  • Genomic DNA was isolated from cells at various differentiation stages: undifferentiated, 4 hours, 2 days, and 15 days post-terminal differentiation.
  • Bioinformatic analysis identified differentially methylated regions (DMRs) and transcription factor (TF) binding sites.

Main Results:

  • Overall genome-wide DNA methylation patterns were similar across pre-, post-, and terminally differentiated adipocytes.
  • A transient decrease in DNA methylation was observed 4 hours post-initiation, followed by a gain approaching terminal differentiation.
  • Novel DMRs were identified, including methylation-dependent "hotspots" enriched with TF binding sites, linked to adipogenesis.

Conclusions:

  • DNA methylation dynamics are crucial for adipocyte differentiation, particularly at specific regulatory regions.
  • Hotspots, characterized by TF binding sites and methylation-dependent binding, play a significant role in adipogenesis.
  • The study reveals context-dependent relationships between promoter DNA methylation and the expression of key adipogenic genes.