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Updated: Jul 6, 2025

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry
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The Wnt-pathway corepressor TLE3 interacts with the histone methyltransferase KMT1A to inhibit differentiation in

Bhargab Kalita1,2, Subhashni Sahu1, Anushree Bharadwaj1

  • 1Developmental Genetics Laboratory Regional Centre for Biotechnology (RCB) NCR Biotech Science Cluster 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad, 121001, Haryana, India.

Oncogene
|January 4, 2024
PubMed

Insights

The corepressor TLE3 inhibits the Wnt-pathway in rhabdomyosarcoma. Targeting TLE3 and KMT1A with drug therapy shows promise for treating this muscle cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Developmental Biology

Background:

  • Rhabdomyosarcoma tumor cells mimic skeletal muscle cells but fail terminal differentiation, driving proliferation and metastasis.
  • The Wnt-pathway is implicated in rhabdomyosarcoma development.
  • Corepressor TLE3's role in rhabdomyosarcoma tumorigenesis is largely unexplored.

Purpose of the Study:

  • To investigate the role of TLE3 in rhabdomyosarcoma.
  • To elucidate the molecular mechanisms by which TLE3 regulates rhabdomyosarcoma cell behavior.
  • To explore TLE3 and Wnt-pathway as potential therapeutic targets.

Main Methods:

  • Utilized TLE3-knockout mouse models and rhabdomyosarcoma cell xenografts.
  • Investigated Wnt-pathway activity and myogenic differentiation markers.
  • Examined the interaction between TLE3 and histone methyltransferase KMT1A.
  • Assessed a combination drug therapy (BIO and chaetocin) in vivo.

Main Results:

  • Loss of TLE3 function activates the Wnt-pathway, reducing proliferation and enhancing differentiation in rhabdomyosarcoma cells.
  • TLE3 knockout in normal muscle development promotes terminal differentiation.
  • TLE3 interacts with KMT1A to repress gene activation and inhibit differentiation.
  • Combination therapy significantly reduced tumor volume, proliferation, and increased differentiation and survival.

Conclusions:

  • TLE3 is a key regulator of rhabdomyosarcoma tumorigenesis by inhibiting the Wnt-pathway.
  • TLE3, the Wnt-pathway, and KMT1A are promising therapeutic targets for rhabdomyosarcoma treatment.
  • Targeting TLE3 and KMT1A offers a potential strategy for novel rhabdomyosarcoma therapies.

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