Analysis of quantitative trait loci for blood pressure on rat chromosomes 2 and 13. Age-related differences in effect

Hypertension
N J SamaniM Lathrop

Abstract

Previous studies have suggested the presence of quantitative trait loci (QTLs) influencing blood pressure on rat chromosomes 2 and 13. In this study, we mapped the QTLs in F2 rats derived from a cross of the spontaneously hypertensive rat and the Wistar-Kyoto rat and analyzed the effect of the QTLs on blood pressures measured longitudinally between 12 and 25 weeks of age. We analyzed 16 polymorphic markers spanning 147.3 cM on chromosome 2 and 13 markers spanning 91.6 cM on chromosome 13. Both chromosomes contained QTLs with highly significant effects on blood pressure (peak logarithm of the odds [LOD] scores, 5.64 and 5.75, respectively). On chromosome 2, the peak was localized to a position at anonymous marker D2Wox7, 2.9 cM away from the gene for the sodium-potassium ATPase alpha 1-subunit. On chromosome 13, the major peak coincided with the marker D13Mit2, 21.7 cM away from the renin gene, but there was a suggestion of multiple peaks. The effect of the QTL on chromosome 2 was seen throughout from 12 to 25 weeks of age, whereas interestingly, the effect for the QTL on chromosome 13 was maximal at 20 weeks of age but disappeared at 25 weeks of age, presumably because of the effect of either epistatic factors or environmental ...Continue Reading

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