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. 1993 Oct 11;21(20):4750–4755. doi: 10.1093/nar/21.20.4750

In vivo analysis of Pim-1 deficiency.

P W Laird 1, N M van der Lugt 1, A Clarke 1, J Domen 1, K Linders 1, J McWhir 1, A Berns 1, M Hooper 1
PMCID: PMC331501  PMID: 8233823

Abstract

The Pim-1 proto-oncogene encodes a highly conserved serine/threonine phosphokinase which is predominantly expressed in hematopoietic organs and gonads in mammals. Overexpression of Pim-1 predisposes to lymphomagenesis in mice. To develop a further understanding of Pim-1 in molecular terms, as well as in terms of its potential role in hematopoietic development, we have generated mice deficient in Pim-1 function. Pim-1-deficient mice are ostensibly normal, healthy and fertile. Detailed comparative analyses of the hematopoietic systems of the mutant mice and their wild-type littermates showed that they are indistinguishable for most of the parameters studied. Our analyses revealed one unexpected phenotype that correlated with the level of Pim-1 expression: Pim-1 deficiency correlated with a erythrocyte microcytosis, whereas overexpression of Pim-1 in E mu-Pim-1-transgenic mice resulted in erythrocyte macrocytosis. In order to confirm that the observed decrease in erythrocyte Mean Cell Volume (MCV) was attributable to the Pim-1 deficiency, we developed mice transgenic for a Pim-1 gene construct with its own promoter and showed that this transgene could restore the low erythrocyte Mean Cell Volume observed in the Pim-1-deficient mice to near wild-type levels. These results might be relevant to the observed involvement of the Pim-1 gene in mouse erythroleukemogenesis. The surprising lack of a readily observed phenotype in the lymphoid compartment of the Pim-1-deficient mice, suggests a heretofore unrecognized degree of in vivo functional redundancy of this highly conserved proto-oncogene.

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Selected References

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