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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
Published on: September 7, 2017
Genome-wide survey reveals dynamic widespread tissue-specific changes in DNA methylation during development
Ping Liang1, Fei Song, Srimoyee Ghosh
1Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada. pliang@brocku.ca
BMC Genomics
|May 17, 2011
Summary
DNA methylation patterns are highly tissue-specific and dynamic during mammalian development. Demethylation plays a key role in tissue differentiation, impacting gene regulation across the genome.
Area of Science:
- Genomics
- Developmental Biology
- Epigenetics
Background:
- DNA methylation is crucial for mammalian development, regulating gene expression.
- Understanding methylation changes is vital for comprehending normal development and disease.
Purpose of the Study:
- To identify tissue- and developmental stage-specific differentially methylated DNA regions (T-DMRs and DS-DMRs) genome-wide.
- To investigate the role of DNA methylation dynamics in mammalian development and differentiation.
Main Methods:
- Utilized Methylated DNA ImmunoPrecipitation (MeDIP) with NimbleGen promoter and CpG island (CpGi) arrays.
- Analyzed DNA methylation across four tissues (brain, heart, liver, testis) at three developmental stages (embryo, newborn, adult) in mice.
Main Results:
- Identified nearly 5,000 adult T-DMRs and 10,000 DS-DMRs, with most DS-DMRs exhibiting tissue specificity.
- Observed a trend of methylation at early stages (E15, NB) decreasing in adults, particularly in non-CpG island promoter regions.
- Found significant methylation in promoter, intragenic, and intergenic regions, not limited to CpG islands.
Conclusions:
- The majority of unique DNA methylation is tissue-specific.
- Demethylation is a critical process in tissue differentiation.
- DNA methylation regulates alternative promoter selection and functions in non-promoter regions, highlighting dynamic, widespread, and tissue-specific epigenetic changes during development.
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