Tn polyagglutination syndrome A hematopoietic system disease that is characterized by red blood cells that agglutinate upon exposure to almost all human sera, but not to autologous serum or the sera of newborns and has_material_basis_in somatic mutation in the C1GALT1C1 gene on chromosome Xq24. DOID:0080520 MIM:300622 disease_ontology galactosyltransferase deficiency hematopoietic system disease