Univariate and bivariate variance component linkage analysis of a whole-genome scan for loci contributing to bone mineral density.
Osteoporosis is a common condition characterized by reduced skeletal strength and increased susceptibility to fracture. The single major risk factor for osteoporosis is low bone mineral density (BMD) and strong evidence exists that genetic factors are in part responsible for an individual's BMD. A cohort of 40 multiplex Caucasian families selected through a proband with osteoporosis was genotyped for microsatellite markers spaced at an average of 10 cM, and linkage to femoral neck (FN), lumbar spine (LS) and trochanter (TR) BMD was analyzed using univariate and bivariate variance component linkage analysis. Maximum univariate multipoint lod-scores were 2.87 on chromosome 1p36 for FN BMD, 1.89 on 6q27 for TR BMD, and 2.15 on 7p15 for LS BMD. Results of bivariate linkage analysis were highly correlated with those of the univariate analysis, although generally less significant, suggesting the possibility that some of these susceptibility loci may exert pleiotropic effects on multiple skeletal sites.
Devoto
Marcella
M
Department of Biomedical Research, Nemours Children's Clinic, Wilmington, DE, USA. mdevoto@nemours.org
Spotila
Loretta D
LD
Stabley
Deborah L
DL
Wharton
Gina N
GN
Rydbeck
Halfdan
H
Korkko
Jarmo
J
Kosich
Richard
R
Prockop
Darwin
D
Tenenhouse
Alan
A
Sol-Church
Katia
K
D000704:Analysis of Variance; D015519:Bone Density / Q000235:genetics*; D002874:Chromosome Mapping / Q000379:methods*; D015331:Cohort Studies; D020022:Genetic Predisposition to Disease; D015894:Genome, Human; D005838:Genotype; D006801:Humans; D008126:Lod Score; D018895:Microsatellite Repeats; D015999:Multivariate Analysis; D010024:Osteoporosis / Q000235:genetics*; D010375:Pedigree; D040641:Quantitative Trait Loci; D012307:Risk Factors