Possible genomic imprinting of three human obesity-related genetic loci.
To detect potentially imprinted, obesity-related genetic loci, we performed genomewide parent-of-origin linkage analyses under an allele-sharing model for discrete traits and under a family regression model for obesity-related quantitative traits, using a European American sample of 1,297 individuals from 260 families, with 391 microsatellite markers. We also used two smaller, independent samples for replication (a sample of 370 German individuals from 89 families and a sample of 277 African American individuals from 52 families). For discrete-trait analysis, we found evidence for a maternal effect in chromosome region 10p12 across the three samples, with LOD scores of 5.69 (single-point) and 4.52 (multipoint) for the pooled sample. For quantitative-trait analysis, we found the strongest evidence for a maternal effect (single-point LOD of 2.85; multipoint LOD of 4.01 for body mass index [BMI] and 3.69 for waist circumference) in region 12q24 and for a paternal effect (single-point LOD of 4.79; multipoint LOD of 3.72 for BMI) in region 13q32, in the European American sample. The results suggest that parent-of-origin effects, perhaps including genomic imprinting, may play a role in human obesity.
Dong
Chuanhui
C
Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, PA 19104-6140, USA.
Li
Wei-Dong
WD
Geller
Frank
F
Lei
Lei
L
Li
Ding
D
Gorlova
Olga Y
OY
Hebebrand
Johannes
J
Amos
Christopher I
CI
Nicholls
Robert D
RD
Price
R Arlen
RA
D000273:Adipose Tissue / Q000473:pathology; D015992:Body Mass Index; D002879:Chromosomes, Human, Pair 10 / Q000235:genetics; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics; D002882:Chromosomes, Human, Pair 13 / Q000235:genetics; D005260:Female; D008040:Genetic Linkage; D005819:Genetic Markers; D018392:Genomic Imprinting; D023281:Genomics; D006801:Humans; D008126:Lod Score; D008297:Male; D009765:Obesity / Q000235:genetics* / Q000473:pathology; D010641:Phenotype; D040641:Quantitative Trait Loci
D005819:Genetic Markers