TY - JOUR
T1 - Exonuclease 1 is essential for maintaining genomic stability and the proliferative capacity of neural but not hematopoietic stem cells
AU - Zhang, Junling
AU - Yang, Runan
AU - Zhou, Daohong
AU - Rudolph, Karl Lenhard
AU - Meng, Aimin
AU - Ju, Zhenyu
N1 - Funding Information:
This work was supported by the National Basic Research Program of China ( 2011CB964800 , 2012CB911203 ), the National Natural Science Foundation of China ( 81130074 ), and by the SENS research foundation to Z. J., and the Development Foundation of the Institute of Radiation Medicine , Chinese Academy of Medical Sciences and Peking Union Medical College ( SF1309 ) to J. Z.
PY - 2014/1
Y1 - 2014/1
N2 - Exonuclease 1 (Exo1) has been implicated in the regulation of DNA damage responses in stem cells with dysfunctional telomeres. However, it is unclear whether Exo1-mediated DNA maintenance pathways play a role in the maintenance of genomic stability and the self-renewal of tissue stem cells in mice with functional telomeres. Here, we analyzed the proliferative capacity of neural stem cells (NSCs) and hematopoietic stem cells (HSCs) from Exo1-/- mice. Our study shows that Exo1 deficiency impairs the maintenance of genomic stability and proliferative capacity in NSCs but not HSCs. In line with these results, we detected a decrease in proliferation and an up-regulation of p21 expression levels in Exo1-deficient NSCs but not Exo1-deficient HSCs. Our data provide experimental evidence that Exo1 deficiency has a differential impact on the homeostasis and proliferative capacity of tissue stem cells in the brain and bone marrow, suggesting that different tissue stem cells utilize distinct mechanisms for maintaining their genomic stability. Our current study provides important insight into the role of Exo1-mediated DNA maintenance pathways in the maintenance of genomic stability and the proliferative capacity of tissue stem cells.
AB - Exonuclease 1 (Exo1) has been implicated in the regulation of DNA damage responses in stem cells with dysfunctional telomeres. However, it is unclear whether Exo1-mediated DNA maintenance pathways play a role in the maintenance of genomic stability and the self-renewal of tissue stem cells in mice with functional telomeres. Here, we analyzed the proliferative capacity of neural stem cells (NSCs) and hematopoietic stem cells (HSCs) from Exo1-/- mice. Our study shows that Exo1 deficiency impairs the maintenance of genomic stability and proliferative capacity in NSCs but not HSCs. In line with these results, we detected a decrease in proliferation and an up-regulation of p21 expression levels in Exo1-deficient NSCs but not Exo1-deficient HSCs. Our data provide experimental evidence that Exo1 deficiency has a differential impact on the homeostasis and proliferative capacity of tissue stem cells in the brain and bone marrow, suggesting that different tissue stem cells utilize distinct mechanisms for maintaining their genomic stability. Our current study provides important insight into the role of Exo1-mediated DNA maintenance pathways in the maintenance of genomic stability and the proliferative capacity of tissue stem cells.
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U2 - 10.1016/j.scr.2013.11.001
DO - 10.1016/j.scr.2013.11.001
M3 - Article
C2 - 24280419
AN - SCOPUS:84888226452
SN - 1873-5061
VL - 12
SP - 250
EP - 259
JO - Stem Cell Research
JF - Stem Cell Research
IS - 1
ER -