RT Journal Article T1 FLT3 functional low-frequency variant rs76428106-C is associated with susceptibility to systemic sclerosis. A1 Martinez-Lopez, Javier A1 Kerick, Martin A1 Ortiz-Fernandez, Lourdes A1 Acosta-Herrera, Marialbert A1 Marquez, Ana A1 Martin, Javier K1 SSc K1 low-frequency variant K1 seropositive immune-mediated diseases AB rs76428106-C, a low frequency polymorphism that affects the splicing of the FLT3 gene, has recently been associated with several seropositive autoimmune diseases. Here, we aimed to evaluate the potential implication of rs76428106-C in the susceptibility to systemic sclerosis (SSc). We analysed a total of 26 598 European ancestry individuals, 9063 SSc and 17 535 healthy controls, to test the association between FLT3 rs76428106-C and SSc and its different subphenotypes. Genotype data of rs76428106 were obtained by imputation of already available genome-wide association study data and analysed by logistic regression analysis. In accordance with that observed in other autoimmune disorders, the FLT3 rs76428106-C allele was significantly increased [P-value = 2.03 × 10-3, odds ratio (OR) = 1.34] in SSc patients compared with healthy controls. A similar risk effect was found when the main SSc clinical and serological subgroups were compared with controls. When comparing SSc patients with and without digital ulcers (DU), the rs76428106-C frequency was significantly increased in DU-positive SSc patients in comparison with DU-negative patients (P-value = 0.036, OR = 2.16). This study is the first to report an association between rs76428176-C and SSc. Our results support the role of FLT3 as a relevant gene in seropositive immune-mediated diseases and a potential biomarker for SSc microangiopathy. PB Oxford University Press YR 2022 FD 2022-07-11 LK http://hdl.handle.net/10668/19834 UL http://hdl.handle.net/10668/19834 LA en NO Martínez-López J, Kerick M, Ortiz-Fernández L, Acosta-Herrera M, Márquez A, Martín J. FLT3 functional low-frequency variant rs76428106-C is associated with susceptibility to systemic sclerosis. Rheumatology (Oxford). 2023 Feb 6;62(SI):SI138-SI142 DS RISalud RD Apr 9, 2025