Replication stress caused by low MCM expression limits fetal erythropoiesis and hematopoietic stem cell functionality.
Nat Commun
; 6: 8548, 2015 Oct 12.
Article
em En
| MEDLINE
| ID: mdl-26456157
ABSTRACT
Replicative stress during embryonic development influences ageing and predisposition to disease in adults. A protective mechanism against replicative stress is provided by the licensing of thousands of origins in G1 that are not necessarily activated in the subsequent S-phase. These 'dormant' origins provide a backup in the presence of stalled forks and may confer flexibility to the replication program in specific cell types during differentiation, a role that has remained unexplored. Here we show, using a mouse strain with hypomorphic expression of the origin licensing factor mini-chromosome maintenance (MCM)3 that limiting origin licensing in vivo affects the functionality of hematopoietic stem cells and the differentiation of rapidly-dividing erythrocyte precursors. Mcm3-deficient erythroblasts display aberrant DNA replication patterns and fail to complete maturation, causing lethal anemia. Our results indicate that hematopoietic progenitors are particularly sensitive to replication stress, and full origin licensing ensures their correct differentiation and functionality.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Células-Tronco Hematopoéticas
/
Replicação do DNA
/
Eritropoese
/
Componente 3 do Complexo de Manutenção de Minicromossomo
Limite:
Animals
Idioma:
En
Revista:
Nat Commun
Ano de publicação:
2015
Tipo de documento:
Article