title: Genetic variation in candidate osteoporosis genes, bone mineral density, and fracture risk: the study of osteoporotic fractures.
abstract: Candidate osteoporosis gene variants were examined for associations with fracture risk and bone mineral density (BMD). A total of 9,704 white women were recruited at four U.S. clinical centers and enrolled into the Study of Osteoporotic Fractures, a longitudinal cohort study. Genotyping of 31 polymorphisms from 18 candidate osteoporosis genes was performed in 6,752 women. Incident radiographic fractures were identified at the third and eighth examinations compared with the baseline examination. BMD was measured at the total hip by dual-energy X-ray absorptiometry. Analyses were adjusted for age, clinic site, and self-reported ethnicity. During a mean follow-up of 14.5 years, a total of 849 hip, 658 vertebral, and 2,496 nonhip/nonvertebral fractures occurred in 6,752 women. Women carrying the ALOX15_G48924T T/T genotype had a higher rate of hip fracture (hazard ratio [HR] = 1.33;95% confidence interval [95% CI] = 1.00-1.77) compared with the G/G genotype. Compared with those carrying the PRL_T228C T/T genotype, women with either the C/C (HR = 0.80; 95% CI = 0.67-0.95) or C/T (HR = 0.81; 95% CI = 0.68-0.97) genotype had a lower rate of nonvertebral/nonhip fractures. Women carrying the BMP2_A125611G G/G genotype had a higher rate of vertebral fracture (odds ratio [OR] = 1.51; 95% CI = 1.03-2.23) compared with the A/A genotype. Women with the ESR1_C1335G G/G genotype had a higher rate of vertebral fracture (OR = 1.64; 95% CI = 1.07-2.50) compared with the C/C genotype. Compared with those with the MMP2_C595T C/C genotype, women with the C/T (OR = 0.79; 95% CI = 0.65-0.96) or T/T (OR = 0.44; 95% CI = 0.27-0.72) genotype had a lower rate of vertebral fracture. In conclusion, polymorphisms in several candidate genes were associated with hip, vertebral, and nonhip/nonvertebral fractures but not with total hip BMD in this large population based cohort study.
authors.affiliation: CPMC Research Institute, San Francisco, CA 94120, USA. gtranah@psg.ucsf.edu
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Tranah
authors.forename: Brent C
authors.initials: BC
authors.lastname: Taylor
authors.forename: Li-Yung
authors.initials: LY
authors.lastname: Lui
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Zmuda
authors.forename: Jane A
authors.initials: JA
authors.lastname: Cauley
authors.forename: Kristine E
authors.initials: KE
authors.lastname: Ensrud
authors.forename: Teresa A
authors.initials: TA
authors.lastname: Hillier
authors.forename: Marc C
authors.initials: MC
authors.lastname: Hochberg
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.forename: Brian K
authors.initials: BK
authors.lastname: Rhees
authors.forename: Henry A
authors.initials: HA
authors.lastname: Erlich
authors.forename: Mark D
authors.initials: MD
authors.lastname: Sternlicht
authors.forename: Gary
authors.initials: G
authors.lastname: Peltz
authors.forename: Steven R
authors.initials: SR
authors.lastname: Cummings
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density / Q000235:genetics*; D015331:Cohort Studies; D005260:Female; D050723:Fractures, Bone / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008137:Longitudinal Studies; D010024:Osteoporosis / Q000235:genetics*; D011110:Polymorphism, Genetic
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