RGD Reference Report - Distinct QTLs are linked to cardiac left ventricular mass in a sex-specific manner in a normotensive inbred rat inter-cross. - Rat Genome Database

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Distinct QTLs are linked to cardiac left ventricular mass in a sex-specific manner in a normotensive inbred rat inter-cross.

Authors: Llamas, B  Jiang, Z  Rainville, ML  Picard, S  Deschepper, CF 
Citation: Llamas B, etal., Mamm Genome. 2005 Sep;16(9):700-11. Epub 2005 Oct 20.
RGD ID: 1578726
Pubmed: PMID:16245027   (View Abstract at PubMed)
DOI: DOI:10.1007/s00335-005-0041-z   (Journal Full-text)

Genetic mapping of the progeny of an F(2) inter-cross between WKY and WKHA rats had previously allowed us to detect male-specific linkage between locus Cm 24 and left ventricular mass index (LVMI). By further expanding that analysis, we detected additional loci that were all linked to LVMI in a sex-specific manner despite their autosomal location. In males, we detected one additional locus (Lvm 8) on Chromosome 5 (LOD=3.4), the two loci Lvm 13 (LOD=4.5) and Lvm 9 (LOD=2.8) on Chromosome 17, and locus Lvm 10 (LOD=4.2) on Chromosome 12. The locus Lvm 13 had the same boundaries as locus Cm 26 previously reported by others using a different cross. None of these loci showed linkage to LVM in females. In contrast, we identified in females the novel locus Lvm 11 on Chromosome 15 (LOD=2.8) and locus Lvm 12 (LOD=2.7) that had the same boundaries on Chromosome 3 as locus Cm 25 detected previously by others using a cross of other normotensive strains. In prepubertal males, there were no differences in the width of cardiomyocytes from WKY and WKHA rats, but cardiomyocytes from WKHA became progressively wider than that of WKY as sexual maturation progressed. Altogether, these results provide evidence that distinct genes may influence LVMI of rats in a sex-dependent manner, maybe by involving sex-specific interactions of sex steroids with particular genes involved in the determination of LVMI and/or cardiomyocyte width.



Objects Annotated

QTLs
Cm54  (Cardiac mass QTL 54)
Cm55  (Cardiac mass QTL 55)
Cm56  (Cardiac mass QTL 56)
Cm57  (Cardiac mass QTL 57)
Cm58  (Cardiac mass QTL 58)
Cm59  (Cardiac mass QTL 59)

Strains
WKHA/Cfd  (WKHA/Cfd)
WKY/Cfd  (WKY/Cfd)


Additional Information