title: Whole genome scan for obstructive sleep apnea and obesity in African-American families.
abstract: Obstructive sleep apnea (OSA) is a common, chronic disease associated with obesity. OSA and obesity are both prevalent in African Americans, who are also at increased risk for secondary complications. To identify susceptibility loci for OSA, we undertook a 9-centimorgans genome scan in 59 African-American pedigrees ascertained on the basis of either an affected individual with laboratory-confirmed disease or a proband who was a neighborhood control subject. Variance component linkage analysis was performed for the quantitative phenotypes apnea-hypopnea index (AHI) and body mass index. A candidate region on chromosome 8q (logarithm of odds [LOD] = 1.29, p = 0.006) gave the only evidence for linkage to the AHI. Body mass index was linked to multiple regions, most significantly to markers on chromosome 4q (LOD = 2.63, p = 0.0006) and 8q (LOD = 2.56, p = 0.0007). Evidence of linkage to the AHI was only slightly reduced after adjustment for body mass index. After adjustment for the AHI, some of the primary linkages to body mass index were greatly reduced whereas others remained suggestive. Our results suggest that there are both shared and unshared genetic factors underlying susceptibility to OSA and obesity, and that the genetic determinants of obesity in this population may be modulated by apnea severity.
authors.affiliation: Western Australian Institute for Medical Research, Centre for Medical Research, University of Western Australia, Perth, Australia. lyle@cyllene.uwa.edu.au
authors.forename: Lyle J
authors.initials: LJ
authors.lastname: Palmer
authors.forename: Sarah G
authors.initials: SG
authors.lastname: Buxbaum
authors.forename: Emma K
authors.initials: EK
authors.lastname: Larkin
authors.forename: Sanjay R
authors.initials: SR
authors.lastname: Patel
authors.forename: Robert C
authors.initials: RC
authors.lastname: Elston
authors.forename: Peter V
authors.initials: PV
authors.lastname: Tishler
authors.forename: Susan
authors.initials: S
authors.lastname: Redline
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American / Q000235:genetics*; D000368:Aged; D015992:Body Mass Index; D002874:Chromosome Mapping; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics; D002889:Chromosomes, Human, Pair 2 / Q000235:genetics; D002895:Chromosomes, Human, Pair 5 / Q000235:genetics; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics; D015331:Cohort Studies; D005192:Family Health; D005260:Female; D008040:Genetic Linkage / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics; D015894:Genome, Human; D006801:Humans; D008126:Lod Score; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D017286:Polysomnography; D012737:Sex Factors; D020181:Sleep Apnea, Obstructive / Q000235:genetics*; D013223:Statistics as Topic