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Updated: Jun 15, 2025

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
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RUNX1 isoforms regulate RUNX1 and target genes differentially in platelets-megakaryocytes: association with clinical

Liying Guan1, Deepak Voora2, Rachel Myers3

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|August 24, 2024
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Summary

RUNX1 isoforms B and C differentially regulate RUNX1 gene expression and target genes. This differential regulation is linked to acute events in cardiovascular disease (CVD).

Keywords:
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Area of Science:

  • Molecular Biology
  • Hematology
  • Genetics

Background:

  • Hematopoietic transcription factor RUNX1 exists as isoforms B and C, derived from P1 and P2 promoters.
  • The specific roles of RUNX1 isoforms in autoregulation and gene control within megakaryocytes and platelets remain unclear.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of RUNX1 isoforms on RUNX1 itself and its downstream target genes.
  • To investigate the association of RUNX1 isoform activity with cardiovascular disease (CVD) outcomes.

Main Methods:

  • Studies involved human erythroleukemia (HEL) cells, HeLa cells, and platelets from healthy volunteers.
  • Chromatin immunoprecipitation, luciferase assays, and RNA sequencing were employed.
  • Analysis included 587 cardiovascular disease patients to correlate RUNX1 target genes with acute events.

Main Results:

  • RUNX1 isoforms B and C differentially bound and regulated P1 and P2 promoters.
  • Isoform B decreased and isoform C increased promoter activities in HeLa cells.
  • Differential regulation of target genes (e.g., MYL9, F13A1) by RUNX1B and RUNX1C was observed in HEL cells and platelets.
  • RUNX1B transcript levels correlated positively with F13A1 and PDE5A, while negatively with MYL9 in platelets.
  • Higher expression of RUNX1 targets F13A1 and RAB31 was associated with acute events in CVD patients.

Conclusions:

  • RUNX1 isoforms B and C exhibit distinct autoregulatory functions and differential control over downstream genes.
  • These isoform-specific regulatory patterns are implicated in the pathogenesis of acute events in cardiovascular disease (CVD).