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Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Published on: December 27, 2017

A novel hereditary macrothrombocytopenia

A L Gilman1, E Sloand, J G White

  • 1Department of Pediatrics, Georgetown University School of Medicine, Washington, DC, USA.

Journal of Pediatric Hematology/Oncology
|November 1, 1995
PubMed
Summary

This study identifies a new inherited giant platelet disorder causing macrothrombocytopenia and hearing loss. Unusual platelet findings suggest early release of immature platelets.

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Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Autosomal-dominant inheritance patterns are key in understanding genetic disorders.
  • Macrothrombocytopenia, characterized by large platelets, can be associated with various clinical manifestations.
  • Hearing loss, particularly late-onset, warrants investigation into underlying systemic causes.

Observation:

  • A family presented with macrothrombocytopenia and hearing loss, both inherited in an autosomal-dominant manner.
  • Blood smear analysis revealed giant platelets with increased mean diameter and volume.
  • Platelet aggregation studies showed diminished responses to epinephrine and arachidonic acid.

Findings:

  • Flow cytometry demonstrated normal platelet membrane glycoproteins but unusual expression of glycophorin A on a significant proportion of giant platelets.
  • Electron microscopy ruled out leukocyte inclusions.
  • Platelet counts were reduced, ranging from 50,000 to 123,000/microliters.

Implications:

  • This syndrome represents a novel giant platelet disorder.
  • The glycophorin A expression suggests a defect in megakaryocytopoiesis, leading to the premature release of immature platelets.
  • Further research into this disorder may elucidate novel pathways in platelet production and function.