Genetic variants within the
CNR2 gene encoding the cannabinoid receptor CB2 have been shown to be associated with osteoporosis and low bone mineral density
(BMD) in case-control studies. We now examined the association of polymorphisms in
CNR2 with hand bone strength in an ethnically homogeneous healthy family sample of European origin (Chuvashians) living in Russia.
We show that non-synonymous
CNR2 SNPs are significantly associated with radiographic hand BMD and breaking bending resistance index (BBRI) by two different
transmission disequilibrium tests. For both tests highly significant
p values (ranging from 0.007 to 0.008 for hand BMD, and from 0.001 to 0.003 for BBRI) were also obtained with additional SNPs
at the
CNR2 locus. The associations remained significant after correction for multiple testing. In conclusion, in addition to the association
of
CNR2 polymorphisms with low BMD at selected clinically relevant skeletal sites, we now report their significant association with
hand bone strength phenotypes using a family-based study design implying an even broader impact of genetic variation at the
CNR2 locus on bone structure and function.