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DNA methylation dynamics in human induced pluripotent stem cells over time
Koichiro Nishino1, Masashi Toyoda, Mayu Yamazaki-Inoue
1Department of Reproductive Biology, National Institute for Child Health and Development, Tokyo, Japan.
Plos Genetics
|June 4, 2011
Summary
Induced pluripotent stem cells (iPSCs) undergo epigenetic reprogramming, showing distinct DNA methylation patterns compared to embryonic stem cells (ESCs). Aberrant methylation events drive iPSC reprogramming, gradually converging towards an ESC-like state over time.
Area of Science:
- Epigenetics
- Stem Cell Biology
- Genomics
Background:
- Epigenetic reprogramming is essential for generating induced pluripotent stem cells (iPSCs).
- Understanding DNA methylation dynamics during iPSC generation is crucial for their therapeutic potential.
- Human embryonic stem cells (ESCs) serve as a benchmark for pluripotency.
Purpose of the Study:
- To investigate the DNA methylation profiles of human iPSC lines.
- To compare epigenetic differences between iPSCs and ESCs.
- To track aberrant methylation changes during long-term iPSC reprogramming.
Main Methods:
- DNA methylation profiling of 22 human iPSC lines and 5 human ESC lines.
- Analysis of iPSC lines derived from diverse cell types.
- Longitudinal monitoring of aberrant methylation sites for up to 42 weeks.
Main Results:
- iPSCs displayed distinct epigenetic differences from ESCs, originating from aberrant methylation in early passages.
- Random aberrant methylation events appeared and disappeared throughout the reprogramming process.
- Continuous passaging reduced iPSC-ESC differences, indicating adaptation towards an ESC-like state.
- iPSC reprogramming involved stochastic de novo methylation and selection within an ESC-compatible environment.
Conclusions:
- Aberrant methylation dynamics, characterized by random events and convergence, are key drivers of long-term iPSC reprogramming.
- iPSCs gradually acquire ESC-like epigenetic characteristics through a process of methylation convergence.
- The findings provide insights into the epigenetic plasticity and maturation of iPSCs.
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