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Related Experiment Videos

[X-linked sideroblastic anemia].

M Muramatsu1, K Usuki, K Izutsu

  • 1NTT Kanto Medical Center, Hospital, Division of Hematology.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology
|September 14, 1999
PubMed
Summary

This study reports a case of X-linked sideroblastic anemia in a young man. Effective treatment involved vitamin B6, iron chelation, and phlebotomy.

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Area of Science:

  • Hematology
  • Genetics
  • Biochemistry

Background:

  • X-linked sideroblastic anemia (XLSA) is a rare inherited disorder characterized by ineffective erythropoiesis and iron overload.
  • Patients typically present with microcytic hypochromic anemia and ringed sideroblasts in bone marrow.
  • Genetic mutations, often in the ALAS2 gene, are the underlying cause.

Observation:

  • A 20-year-old male presented with severe microcytic hypochromic anemia (Hb: 9.3 g/dl, MCV: 82.0 fl, MCHC: 29.5 g/dl) and high red blood cell distribution width (RDW: 26.8%).
  • Bone marrow examination revealed 29.5% ringed sideroblasts and evidence of iron overload.
  • Low delta-aminolevulinic acid synthase (ALAS) activity was noted in bone marrow erythroblasts.

Findings:

  • Despite low ALAS activity, no mutation in the ALAS gene was detected, suggesting potential alternative genetic mechanisms or regulatory issues in this case of XLSA.

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  • The patient's anemia and iron overload were successfully managed.
  • Treatment included oral vitamin B6, iron chelation therapy, and phlebotomy.

    • Implications:

    • This case highlights the importance of considering XLSA in young males with unexplained anemia and ringed sideroblasts, even in the absence of a detectable ALAS gene mutation.
    • The positive response to vitamin B6 suggests its potential therapeutic role in certain forms of sideroblastic anemia.
    • Further research into the genetic and biochemical pathways of XLSA is warranted to improve diagnostic and therapeutic strategies.