Definition:

Chediak-Higashi syndrome (CHS) is a rare autosomal recessive disorder characterized by partial skin and ocular albinism, increased susceptibility to infections, and progressive neuropathy. Clinical reports of CHS have identified mutations throughout the CHS1/LYST gene. Griscelli syndrome (GS) is a rare autosomal recessive disorder caused by mutations in either the myosin VA (GS1), RAB27A (GS2) or melanophilin (GS3) genes. GS is characterized by partial albinism, hepatosplenomegaly, progressive neurological deterioration, hypogammaglobulinemia and pancytopenia. Abnormal-beta-actin disease accompanies neutrophil chemotactic dysfunction. Neutrophil specific granule deficiency is a rare disorder of neutrophil function characterized by a lack of neutrophil secondary granule proteins and associated with recurrent bacterial infections. It has been linked to a defect in the transcription factor CCAAT/enhancer binding protein (C/EBP) epsilon. Myeloperoxidase deficiency is the most common inherited disorder of neutrophils. Heterogeneous mutations in the gene encoding myeloperoxidase have been described. Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a X-chromosomally transmitted disorder. The most frequent clinical manifestations of G6PD deficiency are neonatal jaundice, and acute haemolytic anaemia, which is usually triggered by an exogenous agent. Shwachman-Diamond syndrome (SDS) is a rare autosomal-recessive, multisystem disease characterized by exocrine pancreatic insufficiency, impaired hematopoiesis, and leukemia predisposition. The only gene known to be associated with SDS is SBDS, which encodes a ribosome maturation protein.