RRC ID 159
Author Inomata H, Watanabe T, Iizuka Y, Liang YQ, Mashimo T, Nabika T, Ikeda K, Yanai K, Gotoda T, Yamori Y, Isobe M, Kato N.
Title Identification of quantitative trait loci for cardiac hypertrophy in two different strains of the spontaneously hypertensive rat.
Journal Hypertens Res
Abstract Cardiac hypertrophy and left ventricular hypertrophy are known to be substantially controlled by genetic factors. As an experimental model, we undertook genome-wide screens for cardiac mass in F2 populations bred from the stroke-prone spontaneously hypertensive rats (SHRSP) and normal spontaneously hypertensive rats (SHR) and Wistar Kyoto rats (WKY) of a Japanese colony. Two F2 cohorts were independently produced: F2(SHRSP x WKY) (110 male and 110 female rats) and F2(SHR x WKY) (151 male rats). The ratio of heart weight to body weight (Hw/Bw) was evaluated at 12 months of age in F2(SHRSP x WKY) after salt-loading for 7 months, and at around 15 weeks of age in F2(SHR x WKY) who had been fed a normal rat chow diet. Subsequent to an initial screen with 251 markers in F2(SHRSP x WKY) male progeny, 170 and 161 markers were selected and characterized in F2(SHRSP x WKY) female progeny and F2(SHR x WKY) male progeny, respectively. Markers from four chromosomal regions showed suggestive or significant linkage to Hw/Bw. The strongest and the most consistent linkage was found in the vicinity of D3Mgh16 on rat chromosome (RNO) 3 (a maximal log of the odds score reached 4.0 to 6.6 across the F2 populations studied). In the other three regions on RNO6, RNO10 and RNO13, the degree of linkage was more prominent in either males or females. These data provide solid evidence for a "principal" RNO3 quantitative trait loci regulating Hw/Bw in SHRSP and SHR, and also suggest the possible presence of sexual dimorphism in regard to genetic susceptibility for cardiac hypertrophy.
Volume 28(3)
Pages 273-81
Published 2005-3-1
DOI 10.1291/hypres.28.273
PMID 16097372
MeSH Animals Cardiomegaly / genetics* Chromosome Mapping Female Genetic Linkage Genetic Markers Hypertension / genetics* Male Quantitative Trait Loci* Rats Rats, Inbred SHR / genetics* Rats, Inbred WKY Species Specificity
IF 2.941
Times Cited 11
Rats SHR/Izm(strainID=411) SHRSP/Izm(strainID=409)