Leptin receptor interacts with rat chromosome 1 to regulate renal disease traits

Author:

Warden Craig H.12,Gularte-Mérida Rodrigo3,Fisler Janis S.4,Hansen Susan4,Shibata Noreene4,Le Anh4,Medrano Juan F.3,Stern Judith S.45

Affiliation:

1. Department of Pediatrics, University of California, Davis, California;

2. Rowe Genetics Program, University of California, Davis, California;

3. Department of Animal Science, University of California, Davis, California;

4. Department of Nutrition, University of California, Davis, California; and

5. Department of Internal Medicine, University of California, Davis, California

Abstract

Linkage mapping in a backcross of {Brown Norway [BN/Crl (BN)] × ZUC- LeprfaSte(ZUC)} × ZUC identified a male-specific quantitative trait locus (QTL) for urinary albumin excretion (UAE) on rat chromosome 1. A homozygous ZUC.BN-( D1Rat42- D1Rat90)/Ste congenic was produced containing BN donor alleles from 135 to 276 Mb from chromosome 1 on the ZUC background. We observed threefold higher urinary albumin-to-creatinine ratios (ACR) in 15-wk-old Zucker background strain males than in same sex and age congenic animals when both strains are also homozygous for the ZUC leptin receptor fatty mutation ( LeprfaSte) ( P < 0.0001). We then linkage mapped within the donor region without confounded effects from other chromosomes. Phenotypes were collected in 248 F2 male rats in a population made by crossing parents heterozygous for both the BN donor region and ZUC LeprfaSte. Significant interactions were observed between the Lepr genotype and chromosome 1 QTL for six renal traits: urine volume, UAE at 10 and 15 wk, ACR, right kidney weight, and plasma urea nitrogen. A few traits, such as UAE and ACR, exhibit a second peak at the distal end of the chromosome. Hydronephrosis exhibited one or two QTLs contingent on adjustment for body weight. The results now demonstrate at least two sets of coincident traits with different correlations to kidney function.

Publisher

American Physiological Society

Subject

Genetics,Physiology

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