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An autosomal genomic scan for loci linked to plasma leptin concentration in Pima Indians
K Walder1, R L Hanson, S Kobes
1Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, AZ 85016, USA.
Objective:
To identify chromosomal regions linked to plasma leptin concentrations.
Design:
Autosomal genome-wide scan, including 516 microsatellite markers. Sib-pair (Haseman-Elston) and variance components methods were used to assess genetic linkage.
Subjects:
770 Pima Indians comprising 239 nuclear families (for a total of 1199 sibling-pairs).
Measurements:
Plasma leptin concentrations and body mass index (BMI), adjusted for age and sex.
Results:
The strongest evidence for linkage with plasma leptin concentration was on chromosome 6p logarithm of odds (LOD) = 2.1 by variance components analysis). There was no evidence for linkage to BMI in this region. Additional regions with marginal evidence for linkage to plasma leptin concentration (LOD > or =1.0) were detected on chromosomes 3, 11, 13, 15 and 16.
Conclusions:
The results suggest that a locus on chromosome 6p influences plasma leptin concentrations. Replication studies are needed to exclude the possibility that linkage has been falsely detected.