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Insights into the pathogenesis of psoriatic arthritis from genetic studies

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Abstract

Psoriatic arthritis (PsA) is a relatively common inflammatory arthritis, a spondyloarthritis (SpA), that occurs most often in patients with psoriasis, a common immune-mediated inflammatory skin disease. Both psoriasis and PsA are highly heritable. Genetic and recent genomic studies have identified variants associated with psoriasis and PsA, but variants differentiating psoriasis from PsA are few. In this review, we describe recent developments in understanding the genetic burden of PsA, linkage, association and epigenetic studies. Using pathway analysis, we provide further insights into the similarities and differences between PsA and psoriasis, as well as between PsA and other immune-mediated inflammatory diseases, particularly ankylosing spondylitis, another SpA. Environmental factors that may trigger PsA in patients with psoriasis are also reviewed. To further understand the pathogenetic differences between PsA and psoriasis as well as other SpA, larger cohort studies of well-phenotyped subjects with integrated analysis of genomic, epigenomic, transcriptomic, proteomic and metabolomic data using interomic system biology approaches are required.

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Funding

Sara Rahmati is supported by a National Psoriasis Foundation Early Career grant and a grant from the Atlantic Innovation Fund, Canada. Proton Rahman is supported by a grant from the Atlantic Innovation Fund, Canada. Vinod Chandran is supported by a Pfizer Chair Research Award, Rheumatology, University of Toronto, Canada.

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Correspondence to Vinod Chandran.

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This article is a contribution to the special issue on: Spondyloarthritis - Guest Editors: Robert Inman & Nigil Haroon

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Supplementary information

ESM 1

List of variant genest/choromosomal locations shared between AS and PsA (Set A), AS but not to PsA (Set B), PsA but not to AS (Set C) (xlsx 372 kb)

ESM 2

Enriched pathways in variant genes in Set A(PsA but not AS) (xlsx 372 kb)

ESM 3

Enriched pathways in variant genes in Set B (AS but not PsA) (xlsx 372 kb)

ESM 4

Enriched pathways in variant genes in Set C (shared between AS and PsA) (xlsx 372 kb)

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Rahmati, S., Li, Q., Rahman, P. et al. Insights into the pathogenesis of psoriatic arthritis from genetic studies. Semin Immunopathol 43, 221–234 (2021). https://doi.org/10.1007/s00281-021-00843-2

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