Researchers Reveal Newfound DNA Repair Mechanism
Published online May 16 in the journal Cell, the report describes the molecular mechanism behind a DNA repair pathway that counters the mistaken inclusion of a certain type of molecular building block, ribonucleotides, into genetic codes.
- Published online May 16 in the journal Cell, the report describes the molecular mechanism behind a DNA repair pathway that counters the mistaken inclusion of a certain type of molecular building block, ribonucleotides, into genetic codes.
- Given that ribonucleotide misincorporation can result in detrimental DNA code changes (mutations) and DNA breaks, all organisms have evolved to have a DNA repair pathway called ribonucleotide excision repair (RER) that quickly fixes such errors.
- RNA polymerase motors down the DNA chain, reading the code of DNA "letters" as it transcribes instructions into RNA molecules, which then direct protein building.
- Nudler and coworkers found that during this transcription process, RNA polymerase also finds DNA lesions, and then serves as a platform for the assembly of a DNA repair machine called nucleotide excision repair (NER) complex.