Adult-onset autosomal recessive sideroblastic anemia

Adult-onset autosomal recessive sideroblastic anemia is a rare inherited blood disorder characterized by the appearance of ring sideroblasts in the bone marrow, which are red blood cell precursors (erythroblasts) containing abnormal iron-laden mitochondria arranged in a ring around the nucleus. This condition manifests in adulthood, distinguishing it from congenital forms that present in infancy or childhood. The disease primarily affects the hematopoietic (blood-forming) system, leading to ineffective erythropoiesis — the body's inability to produce functional red blood cells despite adequate or excess iron stores. Patients typically present with symptoms of anemia, including fatigue, weakness, pallor, and exercise intolerance. A hallmark feature is iron overload, which can develop over time due to both ineffective erythropoiesis and, in some cases, transfusion therapy. Iron accumulation may affect the liver, heart, and endocrine organs, potentially leading to secondary complications such as hepatic dysfunction, cardiomyopathy, and diabetes if left untreated. Laboratory findings characteristically show microcytic or normocytic anemia with elevated serum ferritin and transferrin saturation levels. Treatment approaches include pyridoxine (vitamin B6) supplementation, which may improve anemia in some patients, though responsiveness varies. Supportive care with red blood cell transfusions may be necessary for severe anemia, and iron chelation therapy is often required to manage iron overload. Monitoring of organ function, particularly hepatic and cardiac status, is important for long-term management. The condition follows an autosomal recessive inheritance pattern, meaning that both copies of the causative gene must carry pathogenic variants for the disease to manifest.

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