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RIP-Cre revisited, evidence for impairments of pancreatic beta-cell function.

Lee JY, Ristow M, Lin X, White MF, Magnuson MA, Hennighausen L
J Biol Chem. 2006 281 (5): 2649-53

PMID: 16326700 · DOI:10.1074/jbc.M512373200

The Cre/loxP recombinase system for performing conditional gene targeting experiments has been very useful in exploring genetic pathways that control both the development and function of pancreatic beta-cells. One particular line of transgenic mice (B6.Cg-Tg(Ins2-cre)25Mgn/J), commonly called RIP-Cre, in which expression of Cre recombinase is controlled by a short fragment of the rat insulin II gene promoter has been used in at least 21 studies on at least 17 genes. In most of these studies inactivation of the gene of interest was associated with either glucose intolerance or frank diabetes. Experimental evidence has been gradually emerging to suggest that RIP-Cre mice alone display glucose intolerance. In this study experiments from three laboratories demonstrate that RIP-Cre mice, in the absence of genes targeted by loxP sites, are glucose intolerant, possibly due to impaired insulin secretion. In addition, we review the use of RIP-Cre mice and discuss possible molecular underpinnings and ramifications of our findings.

MeSH Terms (12)

Animals Female Gene Targeting Glucose Intolerance Insulin Insulin-Secreting Cells Integrases Male Mice Mice, Transgenic Promoter Regions, Genetic Rats

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