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The endothelin system, consisting of a series of potent vasoconstrictor peptides and their receptors, is potentially important in the control of blood pressure. We found that the gene coding for endothelin-2 (ET2), also known as vasoctive intestine peptide, cosegregated strongly with systolic blood pressure in a F2 population [F2(S x LEW)] derived from a cross of the Dahl salt-sensitive (S) rat and the Lewis (LEW/NCrlBR) (LEW) rat. The ET2 locus was assigned to rat chromosome 5. The testis-specific histone (HITH) locus also strongly cosegregated with blood pressure in the F2(S x LEW) population and was assigned to rat chromosome 17. Genetic maps of the regions containing the quantitative trait loci (QTL) for blood pressure on chromosomes 5 and 17 were constructed and the QTL were localized using the MAPMAKER/QTL program. The rat genes for endothelin-1, endothelin-3, and endothelin receptor A did not cosegregate with blood pressure in several F2 populations tested and were assigned to rat chromosomes 17, 3, and 19, respectively. Endothelin receptor B cosegregated weakly with blood pressure and was provisionally assigned to rat chromosome 15. We conclude that, in the rat, one new blood pressure QTL is located on chromosome 5 marked by the ET2 locus and another new QTL is located on chromosome 17 near the HITH locus.

Genetic mapping of two new blood pressure quantitative trait loci in the rat by genotyping endothelin system genes.