Uniprot Description A form of sideroblastic anemia that shows a variable hematologic response to pharmacologic doses of pyridoxine. Sideroblastic anemia is characterized by anemia of varying severity, hypochromic peripheral erythrocytes, systemic iron overload secondary to chronic ineffective erythropoiesis, and the presence of bone marrow ringed sideroblasts. Sideroblasts are characterized by iron-loaded mitochondria clustered around the nucleus.

Disease Ontology Description A sideoblastic anemia that is characterized by the presence of microcytic hypochromic anemia and iron overload, and has_material_basis_in X-linked inheritance of mutation in the ALAS2 gene that enocdes aminolevulinic acid synthase that catalyzes the first step in heme production.