title: Age- and stage-specific regulation patterns in the hematopoietic stem cell hierarchy.
abstract: The molecular mechanisms that regulate self-renewal and differentiation of very primitive hematopoietic stem and progenitor cells in vivo are still poorly understood. Despite the clinical relevance, even less is known about the mechanisms that regulate these cells in old animals. In a forward genetic approach, using quantitative trait linkage analysis in the mouse BXD recombinant inbred set, this study identified loci that regulate the genetic variation in the size of primitive hematopoietic cell compartments of young and old C57BL6 and DBA/2 animals. Linked loci were confirmed through the generation and analysis of congenic animals. In addition, a comparative linkage analysis revealed that the number of primitive hematopoietic cells and hematopoietic stem cells are regulated in a stage-specific and an age-specific manner.
authors.affiliation: Division of Hematology/Oncology, Department of Internal Medicine, University of Kentucky Medical Center, Lexington, KY 40536-0093, USA.
authors.forename: H
authors.initials: H
authors.lastname: Geiger
authors.forename: J M
authors.initials: JM
authors.lastname: True
authors.forename: G
authors.initials: G
authors.lastname: de Haan
authors.forename: G
authors.initials: G
authors.lastname: Van Zant
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D018507:Gene Expression Regulation, Developmental; D008040:Genetic Linkage; D006410:Hematopoiesis / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D051379:Mice; D020297:Mice, Congenic; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008815:Mice, Inbred Strains