Format

Send to

Choose Destination
Stem Cells. 2017 Mar;35(3):694-704. doi: 10.1002/stem.2514. Epub 2016 Nov 8.

Bistable Epigenetic States Explain Age-Dependent Decline in Mesenchymal Stem Cell Heterogeneity.

Author information

1
INSERM U972, University Paris 11, Hôpital Paul Brousse, Villejuif, France.
2
Faculty of Biology, Mouloud Mammeri University, Tizi-ouzou, Algeria.
3
Interdisciplinary Center for Bioinformatics, University Leipzig, Germany.
4
LIFE: Leipzig Research Center for Civilization Diseases, University Leipzig, Germany.
5
Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany.
6
IBPS Laboratory of Developmental Biology, University Pierre & Marie Curie, Paris, France.

Abstract

The molecular mechanisms by which heterogeneity, a major characteristic of stem cells, is achieved are yet unclear. We here study the expression of the membrane stem cell antigen-1 (Sca-1) in mouse bone marrow mesenchymal stem cell (MSC) clones. We show that subpopulations with varying Sca-1 expression profiles regenerate the Sca-1 profile of the mother population within a few days. However, after extensive replication in vitro, the expression profiles shift to lower values and the regeneration time increases. Study of the promoter of Ly6a unravels that the expression level of Sca-1 is related to the promoter occupancy by the activating histone mark H3K4me3. We demonstrate that these findings can be consistently explained by a computational model that considers positive feedback between promoter H3K4me3 modification and gene transcription. This feedback implicates bistable epigenetic states which the cells occupy with an age-dependent frequency due to persistent histone (de-)modification. Our results provide evidence that MSC heterogeneity, and presumably that of other stem cells, is associated with bistable epigenetic states and suggest that MSCs are subject to permanent state fluctuations. Stem Cells 2017;35:694-704.

KEYWORDS:

Aging; Epigenetics; FACS; Mesenchymal stem cells; Methylation

PMID:
27734598
PMCID:
PMC5347872
DOI:
10.1002/stem.2514
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wiley Icon for PubMed Central
Loading ...
Support Center