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Updated: Aug 31, 2025

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Isolation, Characterization, and Autophagy Function of BECN1-Splicing Isoforms in Cancer Cells

Chinmay Maheshwari1, Chiara Vidoni1, Rossella Titone1

  • 1Laboratory of Molecular Pathology, Department of Health Sciences, Università del Piemonte Orientale "A. Avogadro", 13100 Novara, Italy.

Biomolecules
|August 26, 2022
PubMed

Insights

Alternative splicing of human Beclin 1 (BECN1) generates variants that modulate autophagy and mitophagy. These BECN1 variants may be key to how cancer cells adapt to stress and influence tumor progression.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Biology

Background:

  • Alternative splicing generates diverse protein variants from a single gene.
  • Human Beclin 1 (BECN1) is a crucial autophagy regulator and haploinsufficient tumor suppressor.
  • Reduced BECN1 expression is linked to cancer development and poor prognosis.

Purpose of the Study:

  • To isolate and characterize novel BECN1 transcript variants in human cancer cells.
  • To investigate the functional roles of these BECN1 variants in autophagy and mitophagy.
  • To explore the potential implications of BECN1 alternative splicing in cancer progression.

Main Methods:

  • Isolation and molecular characterization of BECN1 transcript variants (BECN1-α, -β, -γ).
  • Overexpression studies in human breast cancer cells (MDA-MB231).
  • Analysis of protein-protein interactions (Parkin, vacuolar protein sorting 34) and autophagy/mitophagy activity.

Main Results:

  • Three new BECN1 splicing variants (BECN1-α, -β, -γ) were identified alongside the wild-type.
  • BECN1-α stimulates autophagy and mitophagy by interacting with Parkin.
  • BECN1-β inhibits autophagy via a dominant-negative effect, while BECN1-γ shows minimal impact.

Conclusions:

  • Alternative splicing of BECN1 produces functional variants with opposing roles in autophagy.
  • BECN1 variants may allow cancer cells to fine-tune autophagy and mitophagy in response to stress.
  • Targeting BECN1 splicing could offer new therapeutic strategies for cancer treatment.
Keywords:
BH3 domain breast cancersBcl-2Beclin 1alternative splicingautophagyisoformsmitophagyovarian cancers

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