GATA2 deficiency spectrum

GATA2 deficiency spectrum (also known as GATA2 haploinsufficiency, MonoMAC syndrome, DCML deficiency, or Emberger syndrome) is a group of related conditions caused by mutations in the GATA2 gene, which encodes a transcription factor critical for the development and maintenance of blood-forming (hematopoietic) stem cells and the lymphatic system. The disease primarily affects the immune system, blood, and lymphatic system, leading to a wide range of clinical manifestations. Patients typically experience progressive loss of certain white blood cells — particularly monocytes, B lymphocytes, natural killer (NK) cells, and dendritic cells — resulting in severe immunodeficiency. This immunodeficiency predisposes individuals to serious and recurrent infections, including disseminated nontuberculous mycobacterial infections, severe viral infections (such as HPV-related warts and EBV-associated lymphoproliferative disease), and invasive fungal infections. The spectrum of disease also includes a significant predisposition to myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML), which can develop at a young age. Some patients present with primary lymphedema, particularly of the lower extremities, which is characteristic of the Emberger syndrome phenotype. Other features may include sensorineural hearing loss, pulmonary alveolar proteinosis, recurrent skin infections, and venous thrombosis. The clinical presentation is highly variable, even within the same family, and some mutation carriers may remain asymptomatic for years before developing complications. Currently, the only curative treatment for the hematologic and immunologic manifestations of GATA2 deficiency is allogeneic hematopoietic stem cell transplantation (HSCT). Supportive care includes prophylactic antimicrobial therapy to prevent infections, surveillance for MDS/AML through regular bone marrow evaluations, and management of lymphedema. Early recognition and genetic diagnosis are essential for timely intervention, particularly given the risk of malignant transformation. Genetic counseling is recommended for affected families, as the condition follows an autosomal dominant inheritance pattern with variable expressivity and incomplete penetrance.

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