The Rat SA Gene Shows Genotype-Dependent Tissue-Specific Expression

Author:

Kaiser Michael A.1,Lodwick David1,Samani Nilesh J.1

Affiliation:

1. Department of Medicine, University of Leicester, Leicester, U.K.

Abstract

1. SA is a recently identified gene implicated in blood pressure regulation in rodent models of genetic hypertension. In this study we have examined, by Northern blotting, its expression in tissues of the spontaneously hypertensive rat, the Wistar-Kyoto rat and F2 rats, derived from a cross of the spontaneously hypertensive rat with the Wistar-Kyoto rat. 2. We demonstrate that the gene is expressed in a tissue-specific manner. Expression was detected in four sites: kidney, liver, brain and testes. 3. In the kidney and liver expression was higher in the spontaneously hypertensive rat than in the Wistar-Kyoto rat, whereas in the brain and testes the pattern was reversed. 4. In the F2 rats, the levels of SA mRNA in the liver, brain and testes were found to be primarily determined by the genotype at the SA gene locus. 5. The findings suggest the presence of strain-specific cis- and more than one tissue-specific trans-acting factors regulating the expression of the rat SA gene.

Publisher

Portland Press Ltd.

Subject

General Medicine

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