The GOD of Hematopoietic Stem Cells: a Clonal Diversity Model of the Stem Cell Compartment
Overview
Authors
Affiliations
Hematopoietic stem cells (HSC) show heterogeneous behavior even when isolated as phenotypically homogeneous populations. The cellular and molecular mechanisms that control the generation of diversity (GOD) in the HSC compartment are not well understood, but have been the focus of much debate. There is increasing evidence that the most important HSC functions, self-renewal and differentiation, are epigenetically preprogrammed and therefore predictable. Indeed, recent data show that the adult HSC compartment consists of a limited number of functionally distinct subsets of HSC. This contradicts older models of HSC behavior, which postulated a single type of HSC that can be continuously molded into different subtypes of HSC. We propose a clonal diversity model where the adult HSC compartment consists of a fixed number of different types of HSC, each with epigenetically preprogrammed behavior. Aging or disease may change the overall function of the HSC population. The model predicts that these changes reflect the relative composition of the HSC subsets, rather than changes in individual HSC. This view has implications for using HSC in experimental and clinical settings. Selection for the appropriate subsets of HSC, rather than attempts to force HSC to adjust, should improve their utility in transplantation and gene transfer applications.
New insights into hematopoietic differentiation landscapes from single-cell RNA sequencing.
Watcham S, Kucinski I, Gottgens B Blood. 2019; 133(13):1415-1426.
PMID: 30728144 PMC: 6440294. DOI: 10.1182/blood-2018-08-835355.
Dircio-Maldonado R, Flores-Guzman P, Corral-Navarro J, Mondragon-Garcia I, Hidalgo-Miranda A, Beltran-Anaya F Stem Cells Transl Med. 2018; 7(8):602-614.
PMID: 29701016 PMC: 6090508. DOI: 10.1002/sctm.18-0013.
The regulation of hematopoietic stem cell populations.
Mayani H F1000Res. 2016; 5.
PMID: 27408695 PMC: 4926728. DOI: 10.12688/f1000research.8532.1.
Hematopoietic stem cells: concepts, definitions, and the new reality.
Eaves C Blood. 2015; 125(17):2605-13.
PMID: 25762175 PMC: 4440889. DOI: 10.1182/blood-2014-12-570200.
Sieburg H, Cattarossi G, Muller-Sieburg C PLoS Comput Biol. 2013; 9(4):e1003006.
PMID: 23637582 PMC: 3630147. DOI: 10.1371/journal.pcbi.1003006.