Genetic analysis of metabolic defects in the spontaneously hypertensive rat.
Abnormalities in carbohydrate and lipid metabolism are common in patients with essential hypertension and in the spontaneously hypertensive rat (SHR). To identify chromosome regions contributing to this clustering of cardiovascular risk factors in the SHR, we searched for quantitative trait loci (QTL) associated with insulin resistance, glucose intolerance, and dyslipidemia by using the HXB/BXH recombinant inbred (RI) strains. Analysis of variance in RI strains suggested significant effects of genetic factors. A genome screening of the RI strains with more than 700 markers revealed QTL significantly associated with insulin resistance on Chromosomes (Chrs) 3 and 19. The Chr 19 QTL was confirmed by testing a previously derived SHR-19 congenic strain: transfer of a Chr 19 segment delineated by markers D19Rat57 and D19Mit7 from the Brown Norway (BN/Cr) strain onto the genetic background of the SHR/Ola was associated with decreased insulin and glucose concentrations and ameliorated insulin resistance at the tissue level. These findings suggest that closely linked genes on Chr 19, or perhaps even a single gene with pleiotropic effects, influence the clustering of metabolic disturbances in the SHR-BN model.
Pravenec
Michal
M
Institute of Biology and Medical Genetics, 1st Medical Faculty, Charles University, 12800 Prague, Czech Republic. pravenec@biomed.cas.cz
Zídek
Václav
V
Musilová
Alena
A
Simáková
Miroslava
M
Kostka
Vlastimil
V
Mlejnek
Petr
P
Kren
Vladimír
V
Krenova
Drahomíra
D
Bílá
Vlasta
V
Míková
Blanka
B
Jáchymová
Marie
M
Horký
Karel
K
Kazdová
Ludmila
L
St  Lezin
Elizabeth
E
Kurtz
Theodore W
TW
D000818:Animals; D002784:Cholesterol / Q000097:blood / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D005947:Glucose / Q000032:analysis / Q000378:metabolism; D018149:Glucose Intolerance / Q000235:genetics; D005951:Glucose Tolerance Test; D006949:Hyperlipidemias / Q000235:genetics; D007328:Insulin / Q000097:blood / Q000378:metabolism; D007333:Insulin Resistance / Q000235:genetics; D008297:Male; D019655:Quantitative Trait, Heritable; D051381:Rats; D011914:Rats, Inbred BN; D011918:Rats, Inbred SHR / Q000235:genetics* / Q000378:metabolism; D014280:Triglycerides / Q000097:blood / Q000378:metabolism
D007328:Insulin; D014280:Triglycerides; D002784:Cholesterol; D005947:Glucose