Related Experiment Video
Updated: May 18, 2026

11:08
Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
Published on: June 19, 2018
DNA mismatch repair: Dr. Jekyll and Mr. Hyde?
1Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health. peggyh@niddk.nih.gov
Molecular Cell
|September 18, 2012
Summary
A new DNA repair pathway, noncanonical DNA mismatch repair, uses an error-prone polymerase (Pol-η) in nonlymphoid cells. This process resynthesizes DNA opposite damage, potentially leading to somatic mutations.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Somatic mutations arise from DNA damage and replication errors.
- DNA repair mechanisms are crucial for genomic stability.
- The role of specific polymerases in mutation pathways is an active area of research.
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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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