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• W2785752893 abstract "Abstract Emergency (stress) granulopoiesis is an episodic process for the production of granulocytes in response to infectious challenge. We previously determined that Fanconi C, a component of the Fanconi DNA-repair pathway, is necessary for successful emergency granulopoiesis. Fanconi anemia results from mutation of any gene in this pathway and is characterized by bone marrow failure (BMF) in childhood and clonal progression in adolescence. Although murine Fanconi anemia models exhibit relatively normal steady-state hematopoiesis, FANCC−/− mice are unable to mount an emergency granulopoiesis response. Instead, these mice develop BMF and die during repeated unsuccessful emergency granulopoiesis attempts. In FANCC−/− mice, BMF is associated with extensive apoptosis of hematopoietic stem and progenitor cells through an undefined mechanism. In this study, we find that TP53 haploinsufficiency completely rescues emergency granulopoiesis in FANCC−/− mice and protects them from BMF during repeated emergency granulopoiesis episodes. Instead, such recurrent challenges accelerated clonal progression in FANCC−/−TP53+/− mice. In FANCC−/− mice, BMF during multiple emergency granulopoiesis attempts was associated with increased ataxia telangiectasia and Rad3-related protein (Atr) and p53 activation with each attempt. In contrast, we found progressive attenuation of expression and activity of Atr, and consequent p53 activation and apoptosis, in the bone marrow of FANCC−/−TP53+/− mice during this process. Therefore, activation of Atr—with consequent Fanconi-mediated DNA repair or p53-dependent apoptosis—is an essential component of emergency granulopoiesis and it protects the bone marrow from genotoxic stress during this process." @default.
• W2785752893 created "2018-02-23" @default.
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• W2785752893 date "2018-03-15" @default.
• W2785752893 modified "2023-10-07" @default.
• W2785752893 title "<i>TP53</i> Haploinsufficiency Rescues Emergency Granulopoiesis in <i>FANCC</i>−/− Mice" @default.
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• W2785752893 doi "https://doi.org/10.4049/jimmunol.1700931" @default.
• W2785752893 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5834788" @default.
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