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Yoon YM, Storm KJ, Kamimae-Lanning AN, Goloviznina NA, Kurre P. Endogenous DNA Damage Leads to p53-Independent Deficits in Replicative Fitness in Fetal Murine Fancd2 -/- Hematopoietic Stem and Progenitor Cells. Stem Cell Reports 2016; 7:840-853. [PMID: 27720904 PMCID: PMC5106485 DOI: 10.1016/j.stemcr.2016.09.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 09/08/2016] [Accepted: 09/09/2016] [Indexed: 11/30/2022] Open
Abstract
Our mechanistic understanding of Fanconi anemia (FA) pathway function in hematopoietic stem and progenitor cells (HSPCs) owes much to their role in experimentally induced DNA crosslink lesion repair. In bone marrow HSPCs, unresolved stress confers p53-dependent apoptosis and progressive cell attrition. The role of FA proteins during hematopoietic development, in the face of physiological replicative demand, remains elusive. Here, we reveal a fetal HSPC pool in Fancd2−/− mice with compromised clonogenicity and repopulation. Without experimental manipulation, fetal Fancd2−/− HSPCs spontaneously accumulate DNA strand breaks and RAD51 foci, associated with a broad transcriptional DNA-damage response, and constitutive activation of ATM as well as p38 stress kinase. Remarkably, the unresolved stress during rapid HSPC pool expansion does not trigger p53 activation and apoptosis; rather, it constrains proliferation. Collectively our studies point to a role for the FA pathway during hematopoietic development and provide a new model for studying the physiological function of FA proteins. Fancd2−/− fetal HSPCs show spontaneous deficits on replicative stress in development Fancd2−/− FL HSPCs show activated DNA-damage responses and strand-break accumulation Fancd2−/− FL deficits occur without apoptosis and independent of p53 activation MAPK (p38) inhibition rescues Fancd2−/− progenitor defects in vitro and in vivo
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Affiliation(s)
- Young Me Yoon
- Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA; Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA; Pediatric Cancer Biology Program, Oregon Health & Science University, Portland, OR 97239, USA
| | - Kelsie J Storm
- Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA; Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA; Pediatric Cancer Biology Program, Oregon Health & Science University, Portland, OR 97239, USA
| | - Ashley N Kamimae-Lanning
- Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA; Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA; Pediatric Cancer Biology Program, Oregon Health & Science University, Portland, OR 97239, USA
| | - Natalya A Goloviznina
- Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA; Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA; Pediatric Cancer Biology Program, Oregon Health & Science University, Portland, OR 97239, USA
| | - Peter Kurre
- Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA; Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA; Pediatric Cancer Biology Program, Oregon Health & Science University, Portland, OR 97239, USA; OHSU Knight Cancer Institute, Oregon Health & Science University, 3181 Southwest Sam Jackson Park Road, Portland, OR 97239, USA.
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