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Related Concept Videos

Translesion DNA Polymerases02:10

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Other Unique Bacteria01:18

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
Proofreading01:31

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
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Ionizing radiation sensitivity of DNA polymerase lambda-deficient cells.

Christie Vermeulen1, Barbara Bertocci, Adrian C Begg

  • 1Division of Experimental Therapy, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands.

Radiation Research
|December 20, 2007
PubMed
Summary

DNA polymerase lambda deficiency increases sensitivity to hydrogen peroxide and topoisomerase inhibitors but does not affect survival after ionizing radiation exposure in mouse cells.

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Area of Science:

  • Molecular biology
  • Genetics
  • Biochemistry

Background:

  • Ionizing radiation causes DNA damage, including strand breaks and oxidized bases.
  • Mammalian cells utilize non-homologous end joining, homologous recombination, and base excision repair to fix these lesions.
  • DNA polymerase lambda (Pol λ) is implicated in DNA repair pathways like non-homologous end joining and base excision repair.

Purpose of the Study:

  • To investigate the role of DNA polymerase lambda in cellular sensitivity to ionizing radiation.
  • To determine if Pol λ deficiency impacts DNA repair mechanisms and overall radiosensitivity.

Main Methods:

  • Utilized lambda-deficient mouse embryonic fibroblasts (MEFs) and wild-type MEFs.
  • Exposed cells to ionizing radiation, hydrogen peroxide, camptothecin, and etoposide.
  • Assessed cell survival rates to determine sensitivity to different DNA-damaging agents.

Main Results:

  • Lambda-deficient MEFs showed increased sensitivity to hydrogen peroxide.
  • Cells lacking Pol λ exhibited heightened sensitivity to topoisomerase inhibitors camptothecin and etoposide.
  • No significant difference in survival was observed between lambda-deficient and wild-type MEFs after ionizing radiation exposure.

Conclusions:

  • DNA polymerase lambda does not play a major role in determining ionizing radiation sensitivity in vivo.
  • Pol λ deficiency impacts sensitivity to oxidative stress and topoisomerase inhibition, suggesting roles in specific DNA repair pathways beyond general radiosensitivity.