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1.

Hereditary sideroblastic anemia

The essential features of X-linked sideroblastic anemia include the following: (1) a hypochromic microcytic anemia and 2 discrete populations of red blood cells, one microcytic and the other normocytic; (2) marrow ringed sideroblasts, particularly prominent in the late erythroid precursors; (3) a variable hematologic response to pharmacologic doses of pyridoxine; and (4) systemic iron overload secondary to chronic ineffective erythropoiesis. The age of clinical onset of the disorder can vary from in utero to the ninth decade. Whereas males are preferentially affected, females may present with clinically severe anemia. More commonly, female carriers of the disease have an increased red blood cell distribution width and sometimes erythrocyte dimorphism (Fleming, 2002). Genetic Heterogeneity of Sideroblastic Anemia See also SIDBA2 (205950), caused by mutation in the SLC25A38 gene (610819) on chromosome 3p22; SIDBA3 (616860), caused by mutation in the GLRX5 gene (609588) on chromosome 14q32; and SIDBA4 (182170), caused by mutation in the HSPA9 gene (600548) on chromosome 5q31. [from OMIM]

MedGen UID:
1638704
Concept ID:
C4551511
Disease or Syndrome
2.

Anemia, sideroblastic, pyridoxine-refractory, autosomal recessive

MedGen UID:
899109
Concept ID:
C4225425
Disease or Syndrome
3.

Autosomal recessive sideroblastic anemia

A non-syndromic, microcytic/hypochromic sideroblastic anaemia, present from early infancy and characterised by severe microcytic anaemia, which is not pyridoxine responsive, and increased serum ferritin. To date, fewer than 30 unrelated genetically characterised individuals have been reported. Clinical features are those of anaemia and iron overload and include pallor, fatigue, weakness, breathlessness, splenomegaly, hyperglycaemia, glucose intolerance and skin hyperpigmentation. Patients need blood transfusions to survive and do not respond to treatment with pyridoxine. Caused by a homozygous or compound heterozygous mutation in the SLC25A38 gene located on chromosome 3p22.1. The SLC25A38 gene mutation is transmitted as an autosomal recessive trait. [from SNOMEDCT_US]

MedGen UID:
895586
Concept ID:
C4274077
Disease or Syndrome
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