title: Vitamin D receptor genotype is associated with fat-free mass and sarcopenia in elderly men.
abstract: We investigated the association of vitamin D receptor (VDR) genotype with fat-free mass (FFM) in a cohort of 302 older (aged 58-93 years) Caucasian men who underwent body composition analysis by dual-energy X-ray absorptiometry, and completed questionnaires addressing comorbidities, physical activity, and dietary intake. All participants were genotyped for a VDR translation start site (FokI) polymorphism [FF (37.7%), Ff (48.4%), and ff (13.9%)] and the previously studied BsmI polymorphism [BB (24.9%), Bb (37.7%), and bb (37.4%)]. The BsmI polymorphism was not associated with FFM in any analysis; however, the FokI polymorphism was significantly associated with total FFM, appendicular FFM, and relative (kg/m(2)) appendicular FFM (all p <.05), with the FF group demonstrating significantly lower FFM than the Ff and ff groups (e.g., total FFM: FF = 57.6 +/- 0.4, Ff = 59.4 +/- 0.4, ff = 59.4 +/- 0.7 kg; p <.02). Age-adjusted logistic regression revealed a 2.17-fold higher risk for sarcopenia (defined previously as appendicular FFM <7.26 kg/m(2)) in FF homozygotes (95% CI [confidence interval] = 1.19-3.85; p =.03) compared to men with one or more f alleles. The VDR translation start site (FokI) polymorphism is significantly associated with FFM and sarcopenia in this cohort of older Caucasian men.
authors.affiliation: Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, PA, USA. sroth1@umd.edu
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Roth
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Zmuda
authors.forename: Jane A
authors.initials: JA
authors.lastname: Cauley
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Shea
authors.forename: Robert E
authors.initials: RE
authors.lastname: Ferrell
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D015252:Deoxyribonucleases, Type II Site-Specific / Q000235:genetics; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000473:pathology*; D011110:Polymorphism, Genetic; D018167:Receptors, Calcitriol / Q000235:genetics*; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific) / Q000235:genetics
chemical_list: D018167:Receptors, Calcitriol; C058668:DNA modification methylase FokI; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); C053864:endodeoxyribonuclease BsmI; D015252:Deoxyribonucleases, Type II Site-Specific