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Epigenetic status of human embryonic stem cells
Peter J Rugg-Gunn1, Anne C Ferguson-Smith, Roger A Pedersen
1Department of Surgery, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Hills Road, Cambridge, CB2 2XY, UK. pjr36@cam.ac.uk
Nature Genetics
|May 3, 2005
Summary
Human embryonic stem cells show stable epigenetic patterns, with generally normal gene expression and methylation. Prolonged cell culture did not disrupt these crucial imprinting marks.
Area of Science:
- Epigenetics
- Stem Cell Biology
- Genomics
Background:
- Epigenetic regulation is crucial for embryonic development.
- Imprinted genes are essential for normal fetal growth.
- Human embryonic stem cells (hESCs) are vital for regenerative medicine and developmental studies.
Purpose of the Study:
- To assess the epigenetic status of hESCs.
- To investigate the stability of imprinted genes and imprinting control regions in hESCs.
- To determine if prolonged cell culture affects hESC epigenetic profiles.
Main Methods:
- Analysis of allele-specific expression for six imprinted genes.
- Examination of methylation profiles for three imprinting control regions.
- Assessment of epigenetic patterns in hESCs during prolonged passage.
Main Results:
- Generally monoallelic gene expression was observed.
- Normal methylation patterns were identified in imprinting control regions.
- One cell line showed biallelic expression of H19 without losing the gametic methylation imprint during prolonged passage.
Conclusions:
- hESCs exhibit a substantial degree of epigenetic stability.
- Imprinted gene expression and methylation patterns are largely maintained during extended cell culture.
- These findings support the reliability of hESCs for research and therapeutic applications.