Anaemias list

Thiamine-responsive megaloblastic anemia

General info

OMIM code:
ICD-10 code:
Erythropoietic defects
Congenital megaloblastic anemia
  • What causes the disease and how common is it?

    TRMA Is caused by homozygous mutation in the SLC19A2 gene, which encodes a thiamine transporter protein, on chromosome 1q24

  • What are the most frequent symptoms if I have the disease?

    TRMA is characterized by the phenotypic triad of a) megaloblastic anemia, b) sensorineural hearing loss, and c) diabetes mellitus. Onset of megaloblastic anemia is between infancy and adolescence..Examination of the bone marrow reveals megaloblastic anemia with erythroblasts often containing iron-filled mitochondria (ringed sideroblasts).

  • Which treatment must I follow if I have the disease?

    Treatment of TRMA focuses on lifelong use of pharmacologic doses (25-75 mg/day) of thiamine (vitamin B1). With this, anemia is corrected but, the red cells remain macrocytic. Moreover, anemia can recur when thiamine is withdrawn

  • What is the risk of passing the condition on to my children?

    TRMA is inherited in an autosomal recessive manner. At conception, each sib of an affected individual has a 25% chance of being affected, a 50% chance of being an asymptomatic carrier, and a 25% chance of being unaffected and not a carrier. Carrier testing for at-risk relatives and prenatal testing for pregnancies at increased risk are possible for families in which the pathogenic variants have been identified.

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