B cells in triple positive antiphospholipid syndrome

Peripheral B cell selection of autoreactive B cells is crucial for preventing autoimmunity. In this study, we identify that a significant proportion of antiphospholipid (aPL) B cells present in the naive compartment, exhibit polyreactivity and belong to the natural repertoire. We used scRNA Seq to follow B cells with aPL features throughout their development from naïve B cells to plasma cells in patients with PAPS. B cells from triple positive primary PAPS patients were magnetically sorted.