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Italian Journal of Dermatology and Venereology 2021 May 13

DOI: 10.23736/S2784-8671.21.06979-0


language: English

Functional study of TNF-α promoter polymorphisms in psoriasis

Valentina DAPRÁ 1, 2, 3, Renata PONTI 2, Giada LO CURCIO 1, Marialaura ARCHETTI 1, Maddalena DINI 1, Martina GAVATORTA 1, Pietro QUAGLINO 2, Maria Teresa FIERRO 2, Massimiliano BERGALLO 1, 2, 3

1 Pediatric Laboratory, Department of Pediatrics, Regina Margherita Children's Hospital, University of Turin, Turin, Italy; 2 Dermatology Section, Department of Medical Sciences, University of Turin, Turin, Italy; 3 BioMole srl, Academic Spin-off University of Turin, Turin, Italy


BACKGROUND: TNF-α is an important mediator in the pathogenesis of psoriasis and polymorphisms influence its transcription and could be implicated in psoriasis risk and modify certain aspects of disease, such as age at onset of psoriasis vulgaris and disease severity. Six TNF-α single nucleotide polymorphisms (SNPs) in promoter region has been identified and studied but with discordant results. The aim of this study was to evaluate whether the polymorphisms in TNF-α (-238 (rs361525), -308 (rs1800629), -857 (rs1799724), -1031 (rs1799964)) are associated with gravity, prurity, early onset or response to drug therapy in psoriasis in Caucasian Italian patients.
METHODS: 58 psoriasis patients from Turin PSOCARE, 23 with psoriasis vulgaris and 35 with psoriatic arthritis were studied. Ready to used master mix for allelic discrimination of rs1800629, rs361525 and rs1799964 respectively.
RESULTS: Our data showed a significant association between the -857(G) variant and both VAS-itch (p=0,03) and VAS-pain index (p=0,006), OR=0,2 (0,04-0,98) and OR=0,12 (0,02-0,59). No significant association between the genotypes or alleles of TNF-α SNPs as been observed with other clinic-pathologic parameters or etanercept response.
CONCLUSIONS: Our data suggest that -857 CC genotype could be involved in pain and itch severity in psoriasis patients.

KEY WORDS: TNF-α polymorphism; Psoriasis; PCR

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