GATA2 and Decreased total monocyte count: GATA2 deficiency, caused by heterozygous germline GATA2 variants, is associated with MDS/AML, monocytopenia and mycobacterial infections (MonoMAC), dendritic cell, monocyte, B and natural killer (NK) lymphoid deficiency (DMLC), and/or lymphedema [9,28].