title: Influence of genomic loci on measures of chronic kidney disease in hypertensive sibships.
abstract: Genomewide linkage analyses were conducted of serum creatinine, estimated GFR (eGFR), and urine albumin-creatinine ratio (UACR) in search of genetic susceptibility loci for chronic kidney disease in 1351 black (median age 63 yr, 70% women, 79% hypertensive) and 1022 white individuals (median age 61 yr, 56% women, 75% hypertensive) from sibships in which two or more members had essential hypertension diagnosed before age 60 yr. After adjustment for gender, age, diabetes, and use of angiotensin inhibitors, the logarithm-transformed measure of serum creatinine was heritable in both ethnic groups (0.45 in black individuals [P < 0.001]; 0.39 in white individuals [P < 0.001]), as was eGFR (0.52 in black individuals [P < 0.001]; 0.39 in white individuals [P < 0.001]). Log UACR was heritable in black individuals (0.30, P < 0.001) but not in white individuals (0.12; P = 0.059). In black individuals, the univariate maximum multipoint logarithm of odds scores (MLS) were observed on chromosome 7 for log serum creatinine (MLS = 3.65, at 43 cM from pter; P = 0.00002) and eGFR (MLS = 2.52, at 45 cM from pter; P = 0.00033) and for log UACR (MLS = 2.91, at 112 cM from pter; P = 0.00012). In white individuals, only one MLS for log serum creatinine and one for eGFR achieved the logarithm of odds score criterion for "suggestive" evidence of linkage (2 < or = MLS < 3), both on chromosome 3 (at 211 and 209 cM, respectively); however, none did so for log UACR. In black individuals, bivariate linkage analyses of log serum creatinine and pulse pressure (i.e., systolic-diastolic BP) provided "suggestive" evidence of a region on chromosome 5 with pleiotropic effects on both traits (MLS = 3.62, at 85 cM from pter; P = 0.00023). These findings support the utility of genetic linkage analyses for identification of novel risk factors that influence measures of chronic kidney disease, particularly among black individuals.
authors.affiliation: Division of Nephrology and Hypertension, Department of Internal Medicine, Mayo Clinic and Foundation, Rochester MN 55905, USA. turner.stephen@mayo.edu
authors.forename: Stephen T
authors.initials: ST
authors.lastname: Turner
authors.forename: Sharon L R
authors.initials: SL
authors.lastname: Kardia
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Mosley
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Rule
authors.forename: Eric
authors.initials: E
authors.lastname: Boerwinkle
authors.forename: Mariza
authors.initials: M
authors.lastname: de Andrade
mesh_terms: D001741:Black or African American / Q000235:genetics; D000368:Aged; D000419:Albuminuria / Q000652:urine; D002874:Chromosome Mapping; D003404:Creatinine / Q000097:blood* / Q000652:urine; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005919:Glomerular Filtration Rate / Q000235:genetics; D006801:Humans; D006973:Hypertension / Q000208:ethnology / Q000235:genetics*; D007676:Kidney Failure, Chronic / Q000208:ethnology / Q000235:genetics*; D008126:Lod Score; D008297:Male; D008875:Middle Aged; D035781:Siblings; D044465:White People / Q000235:genetics
chemical_list: D003404:Creatinine