title: Genome-wide promoter DNA methylation dynamics of human hematopoietic progenitor cells during differentiation and aging.
abstract: DNA methylation plays an important role in the self-renewal of hematopoietic stem cells and in the commitment to the lymphoid or myeloid lineages. Using purified CD34⁺ hematopoietic progenitor cells and differentiated myeloid cell populations from the same human samples, we obtained detailed methylation profiles at distinct stages of hematopoiesis. We identified a defined set of differentiation-related genes that are methylated in CD34⁺ hematopoietic progenitor cells but show pronounced DNA hypomethylation in monocytes and in granulocytes. In addition, by comparing hematopoietic progenitor cells from umbilical cord blood to hematopoietic progenitor cells from peripheral blood of adult donors we were also able to analyze age-related methylation changes in CD34⁺ cells. Interestingly, the methylation changes observed in older progenitor cells showed a bimodal pattern with hypomethylation of differentiation-associated genes and de novo methylation events resembling epigenetic mutations. Our results thus provide detailed insight into the methylation dynamics during differentiation and suggest that epigenetic changes contribute to hematopoietic progenitor cell aging.
authors.affiliation: Division of Epigenetics, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Bocker
authors.forename: Isabelle
authors.initials: I
authors.lastname: Hellwig
authors.forename: Achim
authors.initials: A
authors.lastname: Breiling
authors.forename: Volker
authors.initials: V
authors.lastname: Eckstein
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Ho
authors.forename: Frank
authors.initials: F
authors.lastname: Lyko
mesh_terms: D000328:Adult; D000375:Aging / Q000235:genetics*; D002454:Cell Differentiation / Q000235:genetics*; D002469:Cell Separation; D019175:DNA Methylation / Q000235:genetics*; D005434:Flow Cytometry; D055106:Genome-Wide Association Study; D006410:Hematopoiesis / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis; D011401:Promoter Regions, Genetic / Q000235:genetics*