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Related Experiment Video

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Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene

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Published on: December 31, 2014

ETV6/RUNX1 abrogates mitotic checkpoint function and targets its key player MAD2L1.

G Krapf¹, U Kaindl, A Kilbey

¹Children's Cancer Research Institute, Vienna, Austria.

|March 2, 2010

Summary

The ETV6/RUNX1 (E/R) gene fusion in childhood leukemia may weaken the mitotic checkpoint (MC). This study reveals E/R down-regulates MAD2L1, an MC component, potentially explaining tetraploidy in leukemia cells.

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Published on: August 25, 2021

Area of Science:

Molecular Biology
Cancer Genetics
Cell Biology

Background:

ETV6/RUNX1 (E/R) gene fusion occurs in ~25% of childhood B-cell precursor acute lymphoblastic leukemia.
This leukemia subtype is linked to specific chromosomal changes like tetraploidy and trisomy 21.

Purpose of the Study:

To investigate the role of the ETV6/RUNX1 (E/R) fusion gene in mitotic checkpoint (MC) regulation.
To explore the relationship between E/R, tetraploidy, and the MAD2L1 gene in leukemia.

Main Methods:

Culturing E/R-expressing Ba/F3 clones and observing karyotype changes.
Treating E/R-expressing diploid cell lines with spindle toxins to assess mitotic activity.
Analyzing the regulation of MAD2L1 mRNA and protein by E/R and RUNX1 through promoter binding assays.

Main Results:

E/R-expressing cells acquired tetraploid karyotypes upon prolonged culture.
E/R-expressing cells showed reduced 4N DNA content and lower mitotic index when exposed to spindle toxins.
E/R and RUNX1 down-regulate MAD2L1 expression by binding to RUNX1 sites in the MAD2L1 promoter.

Conclusions:

ETV6/RUNX1 (E/R) fusion gene attenuates the mitotic checkpoint (MC) by down-regulating MAD2L1.
This provides a molecular link between E/R, MC dysfunction, and MAD2L1 in leukemia.
Tetraploidy in E/R-positive leukemia likely requires additional unknown factors for its development.