Abstract
The purpose of this study is to examine the genetic interaction of variably expressed killer cell immunoglobulin-like receptor (KIR) 3DL1 alleles with their cognate ligand, human leukocyte antigen (HLA)-Bw4, in susceptibility to psoriatic disease (PsD). A novel allelic typing system was developed to differentiate KIR3DL1 alleles (*High, *Low, *Null expression, and 3DS1), in PsD patients, including those with psoriatic arthritis (PsA) and cutaneous psoriasis without arthritis (PsC) and healthy controls. Frequencies of each KIR3DL1 allele, Bw4-80I and Bw4-80T, as well as the genetic interaction between the KIR3DL1 alleles and the Bw4 epitope were analyzed. KIR3DL1 alleles were successfully genotyped in 392 PsA, 260 PsC, and 371 control subjects. Only the KIR3DL1*Null allele was associated with PsD (OR = 0.69, p = 0.008), both in the PsA (OR = 0.69, p = 0.02) and PsC patients (OR = 0.70, p = 0.04) compared to control subjects. No difference in the frequency of KIR3DL1*Null was found between the PsA and PsC patients. The presence of the HLA-Bw4 epitope was significantly associated with PsD, particularly in the PsA patients compared to controls. Bw4-80I was increased in PsD and PsA subjects, but not in PsC patients compared to controls. Bw4-80T was increased in PsA compared to both PsC patients or to controls. No interaction was detected between any of the KIR3DL1 alleles and HLA-Bw4, Bw4-80I, or Bw4-80T. The novel qPCR technique successfully identified the four variably expressed KIR3DL1 alleles. The HLA-Bw4 epitope was associated with psoriatic disease, particularly with PsA, but no genetic interactions with KIR3DL1 alleles were detected.
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Acknowledgments
The PsA clinic is supported by a grant from the Krembil Foundation. Jeffrey Berinstein was supported by the Canadian Institutes of Health Research (CIHR) and Institute of Musculoskeletal Health and Arthritis (IMHA) summer studentship. Remy Pollock was supported by a CIHR Banting and Best Canada Graduate Scholarship Doctoral Research Award.
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Berinstein, J., Pollock, R., Pellett, F. et al. Association of variably expressed KIR3dl1 alleles with psoriatic disease. Clin Rheumatol 36, 2261–2266 (2017). https://doi.org/10.1007/s10067-017-3784-5
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DOI: https://doi.org/10.1007/s10067-017-3784-5