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TACC3 deregulates the DNA damage response and confers sensitivity to radiation and PARP inhibition

G-H Ha1, J-L Kim1, A Petersson1

  • 11] Oncology Institute, Cardinal Bernardin Cancer Center, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA [2] Department of Radiation Oncology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA.

Oncogene
|April 29, 2014
PubMed

Insights

High levels of transforming acidic coiled-coil protein 3 (TACC3) disrupt DNA repair, causing genomic instability and increasing cancer risk. This suggests TACC3 as a potential target for cancer therapy.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Transforming acidic coiled-coil protein 3 (TACC3) is implicated in various cancers.
  • The precise mechanisms of TACC3's oncogenic function are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying TACC3's role in cancer.
  • To investigate how TACC3 influences DNA damage response and genomic stability.

Main Methods:

  • Assessing DNA double-strand breaks (DSBs) in cells with varying TACC3 levels.
  • Analyzing the expression of ataxia telangiectasia mutated (ATM) and DNA damage response (DDR) signaling.
  • Evaluating homologous recombination (HR) and non-homologous end joining (NHEJ) repair pathways.
  • Testing cellular sensitivity to radiation and poly(ADP-ribose) polymerase (PARP) inhibitors.

Main Results:

  • Elevated TACC3 levels correlate with increased DSBs and impaired DNA damage response.
  • High TACC3 expression negatively regulates ATM expression and downstream DDR signaling.
  • Cells with high TACC3 exhibit defective checkpoints and compromised HR/NHEJ repair, leading to genomic instability.
  • Increased TACC3 sensitizes cells to radiation and PARP inhibition.

Conclusions:

  • TACC3 contributes to genomic instability by disrupting DNA repair pathways.
  • These findings highlight TACC3's role in cancer development.
  • TACC3 may serve as a prognostic, diagnostic, and therapeutic target for TACC3-expressing cancers.

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