title: Mapping of genetic loci predisposing to hypertriglyceridaemia in the hereditary hypertriglyceridaemic rat: analysis of genetic association with related traits of the insulin resistance syndrome.
abstract: OBJECTIVE
  Hypertriglyceridaemia is an important risk factor for coronary heart disease, especially in the context of the insulin resistance syndrome where it often occurs with hypertension. The two phenotypes are also associated in the hereditary hypertriglyceridaemic (hHTg) rat. The aim of this study was to map quantitative trait loci that affect plasma triglyceride concentration in the hHTg rat and determine whether they co-localize with loci for blood pressure.
  
  
  METHODS
  Second filial generation progeny (n=189) from a cross of the hHTg rat with the Brown Norway rat were phenotyped for fasting plasma triglyceride, glucose and insulin concentrations, and direct unrestrained resting blood pressure. A partial genome-scan was conducted using 153 microsatellite markers that were polymorphic between the two strains.
  
  
  RESULTS
  A major locus (lod score 6.5) influencing plasma triglyceride concentration in a co-dominant fashion was mapped to chromosome 4 between D1Mit 5 and D1Mit17. Chromosome 8 contained multiple peaks with a lod score greater than 4.0 influencing triglyceride concentration. Importantly, none of the triglyceride loci had an effect on blood pressure. The triglyceride locus on chromosome 4 co-localized with a locus for fasting plasma insulin (lod score 4.1), although the effect on insulin concentration was in the opposite direction to that on triglyceride.
  
  
  CONCLUSIONS
  We have mapped the major loci that affect plasma triglyceride concentration in the hHTg rat. These loci do not influence blood pressure suggesting that these commonly associated phenotypes of the insulin resistance syndrome are not be due to pleiotropic effects of the same gene(s).
authors.affiliation: Diabetes and Nutrition Research Laboratory, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia.
authors.forename: I
authors.initials: I
authors.lastname: Klimes
authors.forename: K
authors.initials: K
authors.lastname: Weston
authors.forename: P
authors.initials: P
authors.lastname: Kovacs
authors.forename: D
authors.initials: D
authors.lastname: Gasperikova
authors.forename: D
authors.initials: D
authors.lastname: Jezova
authors.forename: R
authors.initials: R
authors.lastname: Kvetnansky
authors.forename: J R
authors.initials: JR
authors.lastname: Thompson
authors.forename: E
authors.initials: E
authors.lastname: Sebokova
authors.forename: N J
authors.initials: NJ
authors.lastname: Samani
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000235:genetics / Q000378:metabolism; D001794:Blood Pressure / Q000235:genetics; D002874:Chromosome Mapping; D002875:Chromosomes / Q000235:genetics; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D005819:Genetic Markers; D015228:Hypertriglyceridemia / Q000235:genetics*; D007328:Insulin / Q000097:blood / Q000235:genetics; D007333:Insulin Resistance / Q000235:genetics*; D008297:Male; D010641:Phenotype; D051381:Rats; D011914:Rats, Inbred BN
chemical_list: D001786:Blood Glucose; D005819:Genetic Markers; D007328:Insulin; D004247:DNA