| A rare severe congenital neutropenia disorder with characteristics of lack of mature neutrophils (absolute neutrophil counts less than 500 cells/mm3) associated with frequent, recurrent bacterial infections (for example otitis media, pneumonia, sinusitis, urinary tract infections, abscess of skin and/or liver) and increased promyelocytes in the bone marrow. Periodontal disease, as well as neurological symptoms, such as cognitive impairment, severe neurodegeneration and epilepsy have been reported in some patients. Caused by homozygous or compound heterozygous mutation in the HAX1 gene on chromosome 1q21. |
