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Related Concept Videos

Mutations01:35

Mutations

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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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Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Low dose radiation risk: comment on the opinion article 'Interpretation of risk for low dose radiation exposures: inconsistences, philosophical problems and fallacies' by Walsh (2020).

Journal of radiological protection : official journal of the Society for Radiological Protection·2020
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Related Experiment Video

Updated: Jul 29, 2025

Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines
09:45

Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines

Published on: August 21, 2019

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Radiosensitivity and early onset cancer.

K H Chadwick1

  • 1Cowan Head, Kendal, United Kingdom.

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
|May 24, 2023
PubMed
Summary
This summary is machine-generated.

Individuals with BRCA1, BRCA2, or PALB2 gene mutations exhibit increased radiosensitivity due to DNA repair defects. This leads to earlier cancer onset and necessitates careful radioprotection strategies for these patients.

Keywords:
BRCA 1 and 2DNA repaircancerearly onsethomologous recombinationmutationradiosensitivity

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Area of Science:

  • Oncology
  • Genetics
  • Radiation Biology

Background:

  • Certain gene mutations (BRCA1, BRCA2, PALB2) are linked to increased cancer risk.
  • Homologous recombination repair (HRR) is crucial for DNA double-strand break repair.
  • Understanding radiosensitivity is vital for cancer treatment planning.

Purpose of the Study:

  • To explain the radiosensitivity of individuals with BRCA1, BRCA2, and PALB2 gene mutations.
  • To link HRR defects to increased somatic mutations and early-onset cancer.
  • To highlight the need for specialized radioprotection guidelines.

Main Methods:

  • Utilizing a theory of radiation-induced DNA double-strand breaks.
  • Associating radiosensitivity with HRR defects in gene carriers.
  • Analyzing the accumulation of somatic mutations in relation to cancer development.

Main Results:

  • Defects in HRR lead to elevated somatic mutations throughout the body in gene carriers.
  • This accelerated mutation accumulation is the primary cause of early-onset cancer in these individuals.
  • Increased radiosensitivity is a direct consequence of these underlying genetic defects.

Conclusions:

  • Individuals with BRCA1, BRCA2, and PALB2 mutations have heightened radiosensitivity.
  • Radiotherapy for these patients requires careful consideration of their increased sensitivity.
  • International guidelines for radioprotection are recommended for this population.