TY  - JOUR
A1  - Gómez-Fernández, Paloma
A1  - Lopez de Lapuente Portilla, Aitzkoa
A1  - Astobiza, Ianire
A1  - Mena, Jorge
A1  - Urtasun, Andoni
A1  - Altmann, Vivian
A1  - Matesanz, Fuencisla
A1  - Otaegui, David
A1  - Urcelay, Elena
A1  - Antigüedad, Alfredo
A1  - Malhotra, Sunny
A1  - Montalban, Xavier
A1  - Castillo-Triviño, Tamara
A1  - Espino-Paisán, Laura
A1  - Aktas, Orhan
A1  - Buttmann, Mathias
A1  - Chan, Andrew
A1  - Fontaine, Bertrand
A1  - Gourraud, Pierre-Antoine
A1  - Hecker, Michael
A1  - Hoffjan, Sabine
A1  - Kubisch, Christian
A1  - Kümpfel, Tania
A1  - Luessi, Felix
A1  - Zettl, Uwe K.
A1  - Zipp, Frauke
A1  - Alloza, Iraide
A1  - Comabella, Manuel
A1  - Lill, Christina M.
A1  - Vandenbroeck, Koen
T1  - The rare IL22RA2 signal peptide coding variant rs28385692 decreases secretion of IL-22BP isoform-1, -2 and -3 and is associated with risk for multiple sclerosis
JF  - Cells
N2  - The IL22RA2 locus is associated with risk for multiple sclerosis (MS) but causative variants are yet to be determined. In a single nucleotide polymorphism (SNP) screen of this locus in a Basque population, rs28385692, a rare coding variant substituting Leu for Pro at position 16 emerged significantly (p = 0.02). This variant is located in the signal peptide (SP) shared by the three secreted protein isoforms produced by IL22RA2 (IL-22 binding protein-1(IL-22BPi1), IL-22BPi2 and IL-22BPi3). Genotyping was extended to a Europe-wide case-control dataset and yielded high significance in the full dataset (p = 3.17 × 10\(^{-4}\)). Importantly, logistic regression analyses conditioning on the main known MS-associated SNP at this locus, rs17066096, revealed that this association was independent from the primary association signal in the full case-control dataset. In silico analysis predicted both disruption of the alpha helix of the H-region of the SP and decreased hydrophobicity of this region, ultimately affecting the SP cleavage site. We tested the effect of the p.Leu16Pro variant on the secretion of IL-22BPi1, IL-22BPi2 and IL-22BPi3 and observed that the Pro16 risk allele significantly lowers secretion levels of each of the isoforms to around 50%–60% in comparison to the Leu16 reference allele. Thus, our study suggests that genetically coded decreased levels of IL-22BP isoforms are associated with augmented risk for MS.
KW  - IL22RA2
KW  - IL-22 binding protein isoform
KW  - mutation
KW  - signal peptide
KW  - multiple sclerosis
KW  - autoimmune
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-200769
SN  - 2073-4409
VL  - 9
IS  - 1
ER  -