The deficiency of the late endosomal-lysosomal MEK binding partner 1 (MP1)-interacting protein (also known as p14 and MAPBPIP) causes a primary immunodeficiency syndrome comprising congenital neutropenia, partial albinism, short stature and B-cell and cytotoxic T-cell deficiency. This protein is an adaptor molecule orchestrating the subcellular anatomy of MAP kinase signaling, and is crucial for the function of neutrophils, B cells, cytotoxic T cells and melanocytes.
