Refined mapping of the renal failure RF-3 quantitative trait locus.
Rf-3, a quantitative trait locus (QTL) on rat chromosome 3, affects the development of CKD in Fawn-Hooded Hypertensive (FHH) rats. This QTL spans 110 Mb and approximately 1400 genes; therefore, narrowing the position of this locus is necessary to elucidate potential candidate genes. Here, we used congenic models and comparative genomics to refine the Rf-3 candidate region. We generated congenic lines carrying smaller intervals (subcongenics) of the Rf-3 region and used these lines to reduce the Rf-3 candidate region by 94% (to 7.1 Mb). We used comparative genomics to identify QTL for both nephropathy and albuminuria in the syntenic region of this interval for both human and mouse. We also used the overlapping homologous regions to reduce the number of likely positional candidate genes to 13 known or predicted genes. By combining congenic models and cross-species studies, we narrowed the list of candidate genes to a level that we could sequence the whole interval to further identify the causative gene in future studies.
Human and Molecular Genetics Center, Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
Caitlin C
CC
O'Meara
Jozef
J
Lazar
Matthew
M
Hoffman
Carol
C
Moreno
Howard J
HJ
Jacob
D000419:Albuminuria / Q000235:genetics; D000818:Animals; D001794:Blood Pressure / Q000235:genetics; D002874:Chromosome Mapping / Q000379:methods*; D002908:Chronic Disease; D004195:Disease Models, Animal; D006801:Humans; D007674:Kidney Diseases / Q000235:genetics; D051379:Mice; D040641:Quantitative Trait Loci / Q000235:genetics*; D051381:Rats; D011919:Rats, Inbred Strains; D051437:Renal Insufficiency / Q000235:genetics*