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A genomewide screen was performed in four extended families with early-onset generalized osteoarthritis (FOA) without dysplasia. The FOA phenotype within these families shows a dominant Mendelian inheritance pattern and may represent common osteoarthritis (OA) at later ages. An initial locus was confirmed by three additional families and refined by 14 markers to a two-point logarithm of odds score of 6.05 (theta=0.00) for marker D2S155 at chromosome 2q33.3. This locus coincided with the highest multipoint nonparametric linkage score of 4.70 (P-value=0.0013) at marker D2S2358. Haplotype analysis of family members delineated a narrow region with a number of possible positional candidates, of which we investigate here the two most likely ones: PTHR2, encoding parathyroid hormone receptor 2, and FZD5, encoding frizzled receptor 5. For FZD5, we did not observe a segregating variant, however, for PTHR2, a missense variant (A225S) cosegregated with FOA in one family. The frequency of the PTHR2 variant was rare in a population-based sample, aged 55-70 years (N=1228, 0.4%). Of the 11 carriers, 36% showed generalized radiographic OA as compared to 23% in the remaining population. None of the other families that contributed to the linkage revealed a segregating variant. Together, we have identified a locus on chromosome 2q33.3 for FOA. Candidate gene analysis suggested a possible association of a PTHR2 variant with generalized radiographic OA; it is, however, unlikely the major disease gene for the observed linkage to the FOA phenotype.

Original publication

DOI

10.1038/sj.ejhg.5201704

Type

Journal article

Journal

European journal of human genetics : EJHG

Publication Date

12/2006

Volume

14

Pages

1280 - 1287

Addresses

Molecular Epidemiology, Leiden University Medical Center, Einthovenweg 20, 2300 RC Leiden, The Netherlands. i.meulenbelt@lumc.nl

Keywords

Chromosomes, Human, Pair 2, Humans, Osteoarthritis, Genetic Predisposition to Disease, Receptors, G-Protein-Coupled, Receptor, Parathyroid Hormone, Type 2, Pedigree, Mutation, Genome, Female, Male, Frizzled Receptors