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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.

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Related Experiment Video

Updated: Jun 26, 2026

DNA Methylation: Bisulphite Modification and Analysis
12:34

DNA Methylation: Bisulphite Modification and Analysis

Published on: October 21, 2011

A human B cell methylome at 100-base pair resolution.

Tibor A Rauch1, Xiwei Wu, Xueyan Zhong

  • 1Department of Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 14, 2009
PubMed
Summary

This study maps the human B cell methylome, revealing DNA methylation patterns associated with gene expression and chromosomal regions. Findings suggest methylation influences gene regulation and alternate promoter usage.

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Area of Science:

  • Genomics
  • Epigenetics
  • Human Biology

Background:

  • DNA methylation is a crucial epigenetic mechanism regulating gene expression.
  • Understanding methylation patterns in specific cell types is vital for deciphering gene regulation.

Purpose of the Study:

  • To comprehensively map the human B cell methylome at high resolution.
  • To investigate the relationship between DNA methylation and gene expression in B cells.
  • To explore the functional implications of DNA methylation patterns.

Main Methods:

  • Utilized methylated CpG island recovery assay (MIRA) coupled with whole-genome tiling arrays (MIRA-chip).
  • Characterized the B cell methylome of an individual human at 100-bp resolution.
  • Correlated methylation patterns with gene expression data and chromosomal features.

Main Results:

  • High CpG methylation density correlates with subtelomeric regions and R bands.
  • Most highly methylated regions are gene-associated; ~10% of B cell promoters are methylated, correlating with low gene expression.
  • Intragenic methylation correlates with increased transcription; ~12% of genes show 3' end methylation.
  • Broad methylation regions often occur at segmental duplications.

Conclusions:

  • Provides a high-resolution map of the human B cell methylome.
  • Suggests DNA methylation plays a role in regulating gene expression, including alternate promoter usage.
  • Offers insights into the functional significance of DNA methylation in differentiated human cells.