Genetic Characterization of the Role of the Cip/Kip Family of Proteins As Cyclin-dependent Kinase Inhibitors and Assembly Factors

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 2014 Feb 12

PMID 24515438

Citations 21

Authors

Antonio Cerqueira

Alberto Martin

Catherine E Symonds

Junko Odajima

Pierre Dubus

Mariano Barbacid

David Santamaria

Affiliations

Soon will be listed here.

Abstract

The Cip/Kip family, namely, p21(Cip1), p27(Kip1), and p57(Kip2), are stoichiometric cyclin-dependent kinase inhibitors (CKIs). Paradoxically, they have been proposed to also act as positive regulators of Cdk4/6-cyclin D by stabilizing these heterodimers. Loss of p21(Cip1) and p27(Kip1) reduces Cdk4/6-cyclin D complexes, although with limited phenotypic consequences compared to the embryonic lethality of Cdk4/6 or triple cyclin D deficiency. This milder phenotype was attributed to Cdk2 compensatory mechanisms. To address this controversy using a genetic approach, we generated Cdk2(-/-) p21(-/-) p27(-/-) mice. Triple-knockout mouse embryonic fibroblasts (MEFs) displayed minimal levels of D-type cyclins and Cdk4/6-cyclin D complexes. p57(Kip2) downregulation in the absence of p21(Cip1) and p27(Kip1) aggravated this phenotype, yet MEFs lacking all Cip/Kip proteins exhibited increased retinoblastoma phosphorylation, together with enhanced proliferation and transformation capacity. In vivo, Cdk2 ablation induced partial perinatal lethality in p21(-/-) p27(-/-) mice, suggesting partial Cdk2-dependent compensation. However, Cdk2(-/-) p21(-/-) p27(-/-) survivors displayed all phenotypes described for p27(-/-) mice, including organomegalia and pituitary tumors. Thus, Cip/Kip deficiency does not impair interphasic Cdk activity even in the absence of Cdk2, suggesting that their Cdk-cyclin assembly function is dispensable for homeostatic control in most cell types.

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