Abstract
Introduction
Psoriasis is a systemic, chronic inflammatory disease that not only afflicts the skin but is also associated with cardiovascular disease and metabolic syndrome. The strongest susceptibility loci for the disease is within the human leukocyte antigen (HLA) complex, though specific HLA allelic associations vary between populations.
Objective
Our objective was to investigate HLA associations with clinical phenotypes of psoriasis and metabolic syndrome in Chinese psoriasis cases.
Methods
We conducted an observational case–control study in Singapore with a cohort of psoriasis cases consecutively recruited from an outpatient specialist dermatological center (n = 120) compared with 130 healthy controls.
Results
Significant HLA associations with psoriasis were observed with HLA-A*02:07, B*46:01, C*01:02, and C*06:02. The three-locus haplotype of A*02:07-C*01:02-B*46:01 was also significant (odds ratio [OR] 3.07; p = 9.47 × 10−5). We also observed an association between nail psoriasis and HLA-A*02:07 carriers (OR 4.50; p = 0.002), whereas C*06:02 carriers were less prone to have nail involvement (OR 0.16; p = 0.004). HLA-A*02:07 was also identified as a possible risk allele for hypertension (OR 2.90; p < 0.05), and C*01:02 was a possible risk allele for dyslipidemia (OR 3.36; p < 0.05), both known to be common comorbidities in patients with psoriasis.
Conclusion
Our results demonstrate the growing importance of discerning population-specific clinical phenotypes and their association with certain HLA alleles in psoriasis.
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Acknowledgements
The authors are grateful for the support of research coordinators from the National Skin Centre: Jie Si Kwa, Yan Qin Mak, Umairah Adnan, Joan Fung and Veron Lu.
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MS, SWDL, EST, HHO, and ECR have no conflicts of interest that are directly relevant to the content of this article.
Funding
This study was funded by Singapore Immunology Network F00006 core fund.
Ethical approval and informed consent
This clinical study was approved by the IRB on “Genetic susceptibility in psoriasis with psoriatic arthritis and metabolic syndrome” (IRB number 2014/01132) and conducted according to the principles of the Declaration of Helsinki.
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Shen, M., Lim, S.W.D., Tan, E.S. et al. HLA Correlations with Clinical Phenotypes and Risk of Metabolic Comorbidities in Singapore Chinese Psoriasis Patients. Mol Diagn Ther 23, 751–760 (2019). https://doi.org/10.1007/s40291-019-00423-z
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DOI: https://doi.org/10.1007/s40291-019-00423-z