Genetic influences on hand osteoarthritis in Finnish women--a replication study of candidate genes.
OBJECTIVE
Our aims were to replicate some previously reported associations of single nucleotide polymorphisms (SNPs) in five genes (A2BP1, COG5, GDF5, HFE, ESR1) with hand osteoarthritis (OA), and to examine whether genes (BCAP29, DIO2, DUS4L, DVWA, HLA, PTGS2, PARD3B, TGFB1 and TRIB1) associated with OA at other joint sites were associated with hand OA among Finnish women.


METHODS
We examined the bilateral hand radiographs of 542 occupationally active Finnish female dentists and teachers aged 45 to 63 and classified them according to the presence of OA by using reference images. Data regarding finger joint pain and other risk factors were collected using a questionnaire. We defined two hand OA phenotypes: radiographic OA in at least three joints (ROA) and symptomatic DIP OA. The genotypes were determined by PCR-based methods. In statistical analysis, we used SNPStats software, the chi-square test and logistic regression.


RESULTS
Of the SNPs, rs716508 in A2BP1 was associated with ROA (OR = 0.7, 95% CI 0.5-0.9) and rs1800470 in TGFB1 with symptomatic DIP OA (1.8, 1.2-2.9). We found an interaction between ESR1 (rs9340799) and occupation: teachers with the minor allele were at an increased risk of symptomatic DIP OA (2.8, 1.3-6.5). We saw no association among the dentists. We also found that the carriage of the COG5 rs3757713 C allele increased the risk of ROA only among women with the BCAP29 rs10953541 CC genotype (2.6; 1.1-6.1). There was also a suggestive interaction between the HFE rs179945 and the ESR1 rs9340799, and the carriage of the minor allele of either of these SNPs was associated with an increased risk of symptomatic DIP OA (2.1, 1.3-2.5).


CONCLUSIONS
Our results support the earlier findings of A2BP1 and TBGF1 being OA susceptibility genes and provide evidence of a possible gene-gene interaction in the genetic influence on hand OA predisposition.
Finnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland.
Satu
S
Hämäläinen
Finnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland.
Svetlana
S
Solovieva
Finnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland.
Tapio
T
Vehmas
University of Helsinki, Helsinki University Central Hospital, Radiology department, Helsinki, Finland.
Katariina
K
Luoma
Finnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland.
Päivi
P
Leino-Arjas
Finnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland.
Ari
A
Hirvonen
D003815:Dentists; D005178:Faculty; D005260:Female; D005387:Finland / Q000453:epidemiology; D056726:Genetic Association Studies / Q000379:methods; D005838:Genotype; D006225:Hand / Q000000981:diagnostic imaging*; D006801:Humans; D016015:Logistic Models; D008875:Middle Aged; D010003:Osteoarthritis / Q000145:classification / Q000000981:diagnostic imaging / Q000208:ethnology* / Q000235:genetics*; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D000072260:RNA Splicing Factors; D016601:RNA-Binding Proteins / Q000235:genetics; D011859:Radiography; D012307:Risk Factors; D011795:Surveys and Questionnaires; D053773:Transforming Growth Factor beta1 / Q000235:genetics
C455479:RBFOX1 protein, human; D000072260:RNA Splicing Factors; D016601:RNA-Binding Proteins; C508960:TGFB1 protein, human; D053773:Transforming Growth Factor beta1