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Updated: Sep 1, 2025

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Age-restricted functional and developmental differences of neonatal platelets.

Zhaoyan Liu1, Cecilia Avila2, Lisa E Malone3

  • 1Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, New York, USA.

Journal of Thrombosis and Haemostasis : JTH
|August 13, 2022
PubMed
Summary

Neonatal platelets have unique molecular mechanisms and signaling pathways distinct from adults. Researchers identified DEFA3 and HBG1 as stable biomarkers for neonatal thrombopoiesis, aiding in tracking fetal development.

Keywords:
genetic networksgestational disordersplatelet biomarkersribosome footprintstranscriptomics

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Area of Science:

  • Hematology
  • Molecular Biology
  • Developmental Biology

Background:

  • Neonatal thrombopoiesis exhibits distinct characteristics compared to adults, with underlying molecular mechanisms largely unestablished.
  • Understanding these differences is crucial for diagnosing and managing neonatal bleeding disorders.

Purpose of the Study:

  • To define gene and pathway perturbations regulating the transition from neonatal to adult thrombopoiesis.
  • To identify stable, neonatal-restricted platelet biomarkers for clinical applications.

Main Methods:

  • Integrated ribosome profiling and transcriptomic studies were used to analyze cord blood (CB) platelets.
  • A bioinformatics pipeline was developed to identify reliable neonatal biomarkers.
  • Functional assays assessed platelet responses and megakaryocytopoiesis.

Main Results:

  • CB platelets showed preserved agonist-receptor coupling but restricted cross-agonist activation, indicating functional immaturity.
  • Key genetic perturbations involved in vesicle transport, fusion, and phosphatidylserine exposure were identified.
  • DEFA3 (human defensin neutrophil peptide 3) and HBG1 were identified as highly abundant, stable biomarkers of neonatal thrombopoiesis.
  • DEFA3 expression was significantly higher in neonatal megakaryocytes compared to adult counterparts.

Conclusions:

  • Neonatal thrombopoiesis represents an ontogenetically distinct stage with unique molecular underpinnings.
  • Platelet biomarkers HBG1 and DEFA3 show feasibility for tracking disordered fetal-to-adult megakaryocytopoiesis in vivo.
  • HBG1 expression demonstrated gestational age-dependent patterns, suggesting its potential utility in monitoring fetal development.