Abstract
Previously, we reported a linkage analysis for urinary albumin excretion (UAE) from a backcross population derived from the Dahl salt-sensitive (S) rat and the spontaneously hypertensive rat (SHR) raised on a low-salt diet. The present study sought to examine the effect of salt loading on the observation of UAE quantitative trait loci (QTL) using a F1(S x SHR) x S backcross population (n = 228) raised on a 2% NaCl diet. Parental strain data demonstrated that S rats have significantly higher blood pressure (BP) and UAE compared with either F1(S x SHR) or SHR at 8 wk of age, and this difference was exacerbated by 12 wk of age in response to a high-salt diet (2% NaCl). Genome scans done at 8, 12, and 16 wk of age yielded eight QTL for UAE. At week 8 (low salt), QTL for UAE were observed on rat chromosomes (RNO) 1, 2, 6, 8, 9, 11, 13, and 19. Week 8 linkage analysis confirmed previous linkage data and provided a baseline to examine the effect of salt loading at subsequent time points. At weeks 12 and 16 (after salt- loading), QTL for UAE were observed on RNO1, -6, -8, -9, and -13. Surprisingly, UAE QTL were no longer observed on RNO2, -11, and -19 after salt loading, suggesting that these QTL are attenuated by increased salt intake...Continue Reading
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