Author Kato N, Nabika T, Liang YQ, Mashimo T, Inomata H, Watanabe T, Yanai K, Yamori Y, Yazaki Y, Sasazuki T.
Title Isolation of a chromosome 1 region affecting blood pressure and vascular disease traits in the stroke-prone rat model.
Journal Hypertension
Abstract Recently, a genome-wide screen has shown a major quantitative trait locus (QTL) for a stroke-associated phenotype on rat chromosome 1 (RNO1) independent of QTL for blood pressure (BP) in the stroke-prone spontaneously hypertensive rat (SHRSP) of a Heidelberg colony. However, it remains to be elucidated whether these observations reflect the existence of different genes predisposing to each of the disorders. To address this issue, we performed comprehensive approaches in a Japanese colony, Izm, as follows. First, we undertook genome-wide searches in F1(SHRSP/IzmxWKY/Izm)xSHRSP/Izm back-cross (n=63) to pursue a causal relation between hypertension and stroke. Although the strongest linkage to BP (LOD score of 3.4) was identified on RNO1, its relevance to stroke was not supported in the F1 back-cross studied. Second, we also investigated linkage to BP in F2 progeny (n=175) involving the stroke-resistant (or normal) spontaneously hypertensive rat (SHR). In F2 studies of SHR/Izm, this locus did not appear to constitute a principal BP QTL. Third, we constructed congenic animals with detailed phenotype characterization. Transfer of a chromosomal fragment between markers Klk1 and D1Rat116 from WKY/Izm onto the SHRSP/Izm background lowered systolic BP by 20 to 80 mm Hg, prevented development of apparent stroke, and exaggerated impaired glucose tolerance. In conclusion, we have successfully isolated an RNO1 region affecting BP, stroke, and glucose tolerance in SHRSP/Izm-derived congenic rats. The size of the introgressed region is large, but our novel congenic strain should help delineate complex, genetic impairments underlying BP and associated vascular disease phenotypes.
Volume 42(6)
Pages 1191-7
Published 2003-12
DOI 10.1161/01.HYP.0000103161.27190.67
PII 01.HYP.0000103161.27190.67
PMID 14623828
MeSH Animals Animals, Congenic Blood Pressure / genetics* Chromosomes, Mammalian* Female Gene Expression Genetic Linkage Genetic Markers Hypertension / complications* Hypertension / genetics Male Microsatellite Repeats Phenotype Quantitative Trait Loci* Rats Rats, Inbred SHR Rats, Inbred WKY Stroke / epidemiology Stroke / genetics* Stroke / physiopathology Vascular Diseases / genetics
IF 7.017
Times Cited 32
Rats SHRSP/Izm(strainID=409) WKY/Izm(strainID=412)