Knocking out the Regulatory Beta Subunit of Protein Kinase CK2 in Mice: Gene Dosage Effects in ES Cells and Embryos

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 2005 Dec 13

PMID 16335526

Citations 9

Authors

Olivier Blond

Hans H Jensen

Thierry Buchou

Claude Cochet

Olaf-Georg Issinger

Brigitte Boldyreff

Affiliations

Soon will be listed here.

Abstract

Knocking out the regulatory beta subunit of protein kinase CK2 in mice leads to early embryonic lethality. Heterozygous CK2beta (CK2beta+/-) knockout mice do not show an obvious phenotype. However, the number of heterozygous offsprings from CK2B+/- inter-crossings is lower than expected, meaning that some heterozygous embryos do not survive. Interestingly, CK2beta+/- ES (Embryonic Stem) cells express a considerably lower level of CK2beta than wild-type ES cells, whereas the level of CK2beta in organs from heterozygous adult mice does not significantly differ from those of wild-type mice. The data suggest a compensatory mechanism that adjusts CK2beta levels during development in the majority of, but not in all, cases (Mol Cell Biol 23: 908-915, 2003). In order to find an explanation for the gene dosage effect observed for heterozygous offsprings, we analysed embryos at mid-gestation (E10.5) as well as wild-type and CK2beta+/- ES cells for differences in growth rate and response to different stress agents. Analysis of E10.5 embryos generated from heterozygous matings revealed about 20% of smaller retarded CK2beta+/- embryos. No correlation between CK2beta levels in normal looking and retarded CK2beta+/- embryos were found. However, a different post-translational form of CK2beta protein has been detected in these retarded embryos. Cellular parameters such as growth rate and G1-, G2-checkpoints in ES cells were identical in both wild-type and CK2beta+/- cells. When ES cells were injected to induce differentiated teratocarcinoma in syngenic mice, the size of the tumours correlated with the level of CK2beta.

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