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Genetic inactivation of Cdk7 leads to cell cycle arrest and induces premature aging due to adult stem cell exhaustion
Author(s) -
Ganuza Miguel,
SáizLadera Cristina,
Cañamero Marta,
Gómez Gonzalo,
Schneider Ralph,
Blasco María A,
Pisano David,
Paramio Jesús M,
Santamaría David,
Barbacid Mariano
Publication year - 2012
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/emboj.2012.94
Subject(s) - biology , stem cell , microbiology and biotechnology , cell , cell cycle , cell cycle checkpoint , premature aging , genetics
Cyclin‐dependent kinase (Cdk)7, the catalytic subunit of the Cdk‐activating kinase (CAK) complex has been implicated in the control of cell cycle progression and of RNA polymerase II (RNA pol II)‐mediated transcription. Genetic inactivation of the Cdk7 locus revealed that whereas Cdk7 is completely dispensable for global transcription, is essential for the cell cycle via phosphorylation of Cdk1 and Cdk2. In vivo , Cdk7 is also indispensable for cell proliferation except during the initial stages of embryonic development. Interestingly, widespread elimination of Cdk7 in adult tissues with low proliferative indexes had no phenotypic consequences. However, ablation of conditional Cdk7 alleles in tissues with elevated cellular turnover led to the efficient repopulation of these tissues with Cdk7‐expressing cells most likely derived from adult stem cells that may have escaped the inactivation of their targeted Cdk7 alleles. This process, a physiological attempt to maintain tissue homeostasis, led to the attrition of adult stem cell pools and to the appearance of age‐related phenotypes, including telomere shortening and early death.