U.S. flag

An official website of the United States government

GTR Home > Conditions/Phenotypes > Amegakaryocytic thrombocytopenia, congenital, 2

Amegakaryocytic thrombocytopenia, congenital, 2

Summary

Congenital amegakaryocytic thrombocytopenia-2 (CAMT2) is an autosomal recessive disorder characterized by thrombocytopenia with progression to pancytopenia, aplastic anemia, and bone marrow failure. Serum THPO is decreased or inappropriately normal, and bone marrow is hypocellular with decreased or absent megakaryocytes. Most patients present in infancy or early childhood and have a severe disease course, whereas some have later onset and milder symptoms. Bone marrow transplant is ineffective because the defect is extrinsic to hematopoietic cells. Treatment with THPO receptor (MPL; 159530) agonists results in clinical improvement and restoration of trilineage hematopoiesis (Dasouki et al., 2013; Seo et al., 2017). For a discussion of genetic heterogeneity of CAMT, see CAMT1 (604498). [from OMIM]

Genes See tests for all associated and related genes

  • Also known as: CAMT2, MGDF, MKCSF, ML, MPLLG, THC9, THCYT1, TPO, THPO
    Summary: thrombopoietin

Clinical features

Help
Imported from Human Phenotype Ontology (HPO)

Show allHide all

IMPORTANT NOTE: NIH does not independently verify information submitted to the GTR; it relies on submitters to provide information that is accurate and not misleading. NIH makes no endorsements of tests or laboratories listed in the GTR. GTR is not a substitute for medical advice. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.