title: Genetic linkage and imprinting effects on body mass index in children and young adults.
abstract: Body mass index (BMI) is used as a measure of fatness. Here we performed a genome-wide scan for genes related to BMI, while allowing for the possible effects of imprinting. We applied a sib pair linkage analysis to a sample of primarily children and young adults by using the Haseman-Elston method, which we modified to model the separate effects of paternally and maternally derived genetic factors. After stratification of sib pairs according to age, a number of regions showing linkage with BMI were identified. Most linkage and imprinting effects were found in children 5-11 years of age. Strongest evidences for linkage in children were found on chromosome 20 at 20p11.2-pter near the marker D20S851 (LOD(Total)=4.08, P=0.000046) and near the marker D20S482 (LOD(Total) =3.55, P=0.00016), and Chromosome 16 at 16p13 near the marker ATA41E04 (LOD(Total) =3.12, P=0.00025), and those loci did not show significant evidence for imprinting. Six regions showing evidence of imprinting were 3p23-p24 (paternal expression), 4q31.1-q32 (maternal expression), 10p14-q11 (paternal expression), and 12p12-pter (paternal expression) in children, and 4q31-qter (paternal expression) and 8p (paternal expression) in adults.
authors.affiliation: Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Olga Y
authors.initials: OY
authors.lastname: Gorlova
authors.forename: Christopher I
authors.initials: CI
authors.lastname: Amos
authors.forename: Nancy W
authors.initials: NW
authors.lastname: Wang
authors.forename: Sanjay
authors.initials: S
authors.lastname: Shete
authors.forename: Stephen T
authors.initials: ST
authors.lastname: Turner
authors.forename: Eric
authors.initials: E
authors.lastname: Boerwinkle
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D015992:Body Mass Index; D002648:Child; D002675:Child, Preschool; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics / Q000502:physiology; D002890:Chromosomes, Human, Pair 20 / Q000235:genetics / Q000502:physiology; D008040:Genetic Linkage / Q000235:genetics* / Q000502:physiology*; D018392:Genomic Imprinting / Q000235:genetics*; D006801:Humans; D008957:Models, Genetic