RT Journal Article T1 Immunological features of patients affected by Barraquer-Simons syndrome A1 Corvillo, Fernando A1 Ceccarini, Giovanni A1 Nozal, Pilar A1 Magno, Silvia A1 Pelosini, Caterina A1 Garrido, Sofía A1 López Lera, Alberto A1 Moraru, Manuela A1 Vilches, Carlos A1 Fornaciari, Silvia A1 Gabbriellini, Sabrina A1 Santini, Ferruccio A1 Araujo-Vilar, David A1 López Trascasa, Margarita K1 Complement system K1 Lipodystrophy K1 C3 nephritic factor K1 Autoimmunity K1 Acquired partial lipodystrophy K1 Barraquer-Simons syndrome AB C3 hypocomplementemia and the presence of C3 nephritic factor (C3NeF), an autoantibody causingcomplement system over-activation, are common features among most patients affected by Barraquer-Simonssyndrome (BSS), an acquired form of partial lipodystrophy. Moreover, BSS is frequently associated with autoimmunediseases. However, the relationship between complement system dysregulation and BSS remains to be fullyelucidated. The aim of this study was to provide a comprehensive immunological analysis of the complementsystem status, autoantibody signatures and HLA profile in BSS. Thirteen subjects with BSS were recruited for thestudy. The circulating levels of complement components, C3, C4, Factor B (FB) and Properdin (P), as well as anextended autoantibody profile including autoantibodies targeting complement components and regulators wereassessed in serum. Additionally, HLA genotyping was carried out using DNA extracted from peripheral bloodmononuclear cells PB BMC YR 2020 FD 2020 LK http://hdl.handle.net/10347/21692 UL http://hdl.handle.net/10347/21692 LA eng NO Corvillo, F., Ceccarini, G., Nozal, P. et al. Immunological features of patients affected by Barraquer-Simons syndrome. Orphanet J Rare Dis 15, 9 (2020). https://doi.org/10.1186/s13023-019-1292-1 NO This work was supported by Instituto de Salud Carlos III (Ministerio de Ciencia, Innovación y Universidades, Gobierno de España) and Fondos FEDER (PI15–00255 to M.L-T. and PI08–1449 to D.A-V.), Complemento II-CM network (B2017/BMD3673 to M.L-T), the intramural research program of the Xunta de Galicia (Programa de Consolidación e Estructuración de Unidades de Investigación Competitivas, grant ED341b 2017/19 to D.A-V.), the Asociación Española de Familiares y Afectados de Lipodistrofias (AELIP) (to D.A-V., to F.C. and to P.N.) DS Minerva RD 28 abr 2026