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Mutations01:39

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Mutations01:35

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Targeting the DNA Damage Response in OSCC with TP53 Mutations.

A Lindemann1, H Takahashi1, A A Patel1

  • 11 Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.

Journal of Dental Research
|March 1, 2018
PubMed
Summary
This summary is machine-generated.

TP53 gene mutations are common in oral squamous cell carcinoma (OSCC) and linked to poor outcomes. Targeting TP53 and DNA repair pathways may offer new treatments for OSCC patients with these mutations.

Keywords:
biomarkerscancer biologyoncologyoral carcinogenesistreatment planningtumor biology

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Oral squamous cell carcinoma (OSCC) is a prevalent cancer with poor survival rates.
  • Tobacco, alcohol, and betel nut use are key risk factors for OSCC.
  • Current treatments like radiotherapy and chemotherapy show limited efficacy in improving overall survival.

Purpose of the Study:

  • To investigate the role of TP53 gene mutations in OSCC.
  • To explore the association between TP53 mutations and treatment outcomes in OSCC patients.
  • To identify novel therapeutic strategies targeting TP53 mutant OSCC.

Main Methods:

  • Whole-exome sequencing to identify TP53 mutations in OSCC.
  • Analysis of clinical data correlating TP53 mutation status with survival and treatment response.
  • Review of DNA damage response pathways and potential therapeutic targets.

Main Results:

  • TP53 mutations are frequently observed in human papillomavirus-negative OSCC.
  • TP53 mutations are associated with poorer survival and resistance to radiotherapy and chemotherapy.
  • The DNA damage response pathway, involving ATM, ATR, Chk1/2, and Wee1, is activated by DNA damage.

Conclusions:

  • TP53 mutation status is a potential prognostic and predictive marker in OSCC.
  • Targeting DNA repair and replication stress pathways presents a promising therapeutic avenue.
  • Developing drugs that restore wild-type p53 activity could benefit OSCC patients with mutant p53 tumors.