Annals of the Rheumatic Diseases 2008;67:1111-1115
EXTENDED REPORTS
Genetic variations in the serotonin 5-HT2A receptor gene (HTR2A) are associated with rheumatoid arthritis
1 Division of Clinical Pharmacology, University Hospital, Umeå, Sweden
2 Rheumatology Unit, Department of Medicine, Karolinska Institutet/Karolinska University Hospital, Stockholm, Sweden
3 Department of Public Health and Clinical Medicine, Rheumatology, University Hospital, Umeå, Sweden
4 Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
5 Stockholm Center for Public Health, Karolinska University Hospital, Stockholm, Sweden
A Kling, Division of Clinical Pharmacology, University Hospital, SE-901 85 Umeå, Sweden; anders.kling{at}pharm.umu.se
Objectives: To analyse the association between the genetic polymorphisms within the HTR2A gene for the serotonin receptor and rheumatoid arthritis (RA).
Methods: HTR2A gene polymorphisms were analysed in patients with RA and controls from two study populations using PCR based restriction endonuclease mapping or TaqMan allelic discrimination with more than 4000 individuals included in the current study.
Results: At the discovery stage we detected significant differences in frequency of rs6313 (T102C polymorphism) between the patients with RA and controls (p = 0.006). Following validation with an extended set of single nucleotide polymorphisms (SNPs) and number of DNA samples, a trend in associations in allelic model for SNPs rs6314, rs1328674, rs6313 and rs6311 (p = 0.006, 0.002, 0.006, 0.009) was seen, although it was lost after correction for multi-comparison for all but rs1328674 (empirical p value = 0.021). However, haplotype frequency analysis based on these four SNPs showed significantly low representation of TCTT combination in patients with RA in comparison with controls (3.6% and 5.6%, p<0.001 on 
2 test, empirical p = 0.004 after 100 000 permutations) and a significantly higher frequency of CTCC combination in patients with RA in comparison with controls (3.6% and 2.2%, p = 0.002 on 2 test, empirical p = 0.022 after 100 000 permutations).
Conclusions: In our study, genetic polymorphisms at the HTR2A gene are associated with susceptibility for RA, suggesting possible links between the serotonergic system and development of the disease.
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