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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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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.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Mismatch prime editing gRNA increased efficiency and reduced indels.

Jidong Fei1,2,3,4,5, Dongdong Zhao6,7, Caiyi Pang2,4,8

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Mismatched prime editing guide RNAs (mpegRNAs) improve genome editing efficiency and reduce unwanted DNA insertions and deletions (indels). This advance enhances the safety and efficacy of prime editing for research and therapeutic applications.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioengineering

Background:

  • Prime editing offers precise genome editing but faces limitations.
  • Pegylated guide RNA (pegRNA) secondary structures and sustained system activity cause inefficiencies and off-target mutations like indels.

Purpose of the Study:

  • To develop a novel mismatched pegRNA (mpegRNA) strategy to overcome prime editing limitations.
  • To enhance prime editing efficiency and reduce unintended indel formation for safer therapeutic applications.

Main Methods:

  • Designed and synthesized mismatched pegRNAs (mpegRNAs) with altered protospacer complementarity.
  • Evaluated mpegRNA performance in prime editing systems, assessing editing efficiency and indel rates.
  • Utilized AlphaFold 3 for structural analysis of mpegRNA interactions.

Main Results:

  • mpegRNA significantly enhanced prime editing efficiency by up to 2.3-fold.
  • mpegRNA reduced indel formation by 76.5% compared to standard pegRNAs.
  • Combinations of mpegRNA with epegRNA achieved up to 14-fold efficiency gains.

Conclusions:

  • The mpegRNA strategy effectively mitigates secondary structure formation and sustained activity, improving prime editing outcomes.
  • mpegRNA represents a significant advancement for prime editing technology, enhancing its utility in both research and clinical settings.