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Related Experiment Video

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Platelet transcriptome analysis in patients with germline RUNX1 mutations.

Verónica Palma-Barqueros1, José María Bastida2, María José López Andreo3

  • 1Servicio de Hematología y Oncología Médica, Hospital Universitario Morales Meseguer, Centro Regional de Hemodonación, Universidad de Murcia, IMIB-Pascual Parrilla, CIBERER-U765, Murcia, Spain.

Journal of Thrombosis and Haemostasis : JTH
|February 3, 2023
PubMed
Summary

RUNX1 variants p.Gln268* and p.Thr196Ala are pathogenic, causing platelet disorders and increasing leukemia risk. Platelet RNA analysis helps classify RUNX1 variants and identify new targets.

Keywords:
RUNX1-familial platelet disorderhigh-throughput sequencinginherited thrombocytopeniasleukemiamyelodysplastic syndromeplatelet transcriptomics

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Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Germline mutations in RUNX1 gene cause familial platelet disorder with a high risk of acute myeloid leukemia (AML) or myelodysplastic syndrome (MDS).
  • Accurate classification of novel RUNX1 variants is crucial for effective patient management and risk assessment.

Purpose of the Study:

  • To further characterize RUNX1 variants using transcriptome analysis.
  • To evaluate the functional impact of identified RUNX1 variants on platelet gene expression.

Main Methods:

  • Included three patients with thrombocytopenia and heterozygous RUNX1 variants.
  • Performed platelet transcriptome analysis on purified platelets.
  • Correlated gene expression profiles with clinical parameters and familial segregation.

Main Results:

  • Transcriptome analysis revealed aberrant gene expression in patients with pathogenic RUNX1 variants (p.Gln268* and p.Thr196Ala), but not in the non-pathogenic variant (p.Asn159Ser).
  • Identified alterations in actin cytoskeleton, GFI1B downregulation, defective GPVI signaling, and reduced alpha granule proteins.
  • Distinct gene expression profiles were observed and partitioned with clinical data.

Conclusions:

  • Platelet phenotype, familial data, and transcriptomics confirm pathogenicity of RUNX1 variants p.Gln268* and p.Thr196Ala.
  • Platelet RNA analysis serves as a valuable tool for classifying RUNX1 variants and discovering novel RUNX1 targets.