The present invention relates to a method for screening engineered
antibody Fc regions having modified
Fc receptor binding properties, the method comprising the steps of: (a) providing a plurality of cells displaying engineered
antibody Fc regions on their
cell surface, preferably wherein each
cell comprised in the plurality of cells displays an engineered
antibody Fc region comprising at least one
mutation; (b) contacting the cells in step (a) with an
Fc receptor; (c) separating cells that have been contacted with the
Fc receptor in step (b) into two or more
cell populations according to their ability to bind to the Fc
receptor, preferably wherein the ability of an engineered antibody Fc region to bind to the Fc
receptor is determined by comparison with a reference antibody Fc region; and (d) sequencing cells from at least one of the populations obtained in step (c), preferably to identify mutations in the engineered antibody Fc region that (i) confer improved binding to the Fc
receptor, (ii) do not affect binding to the Fc receptor, and / or (iii) confer reduced binding to the Fc receptor. Further provided herein are methods for predicting the
Fc receptor binding properties of an engineered antibody Fc region, as well as methods for generating an engineered antibody Fc region having desired
Fc receptor binding properties