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Errors in DNA Replication

📑 5 slides 👁 15 views 📅 2/10/2026
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Introduction to DNA Replication Errors

DNA replication is highly accurate but not perfect, with errors occurring roughly once per billion base pairs.

Introduction to DNA Replication Errors
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Common Types of Replication Errors

  • Mismatches: Incorrect base pairing, e.g., A with C instead of T, due to polymerase mistakes.
  • Insertions/deletions: Extra or missing nucleotides, often from strand slippage in repetitive regions.
  • Tautomeric shifts: Rare base forms causing mispairing, corrected by proofreading enzymes.
Common Types of Replication Errors
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Causes of Replication Errors

  • Polymerase inaccuracies: DNA pol III makes ~1 error per 100,000 bases; proofreading reduces this.
  • Environmental factors: UV light or chemicals damage DNA, increasing error rates during repair.
  • Replication stress: Fast division or limited nucleotides force errors in cancer cells.
Causes of Replication Errors
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Consequences of Unrepaired Errors

  • Cancer: Mutations in oncogenes or tumor suppressors drive uncontrolled cell growth.
  • Genetic disorders: Germline errors cause diseases like cystic fibrosis or sickle cell anemia.
  • Evolution: Beneficial mutations accumulate, driving species adaptation over generations.
Consequences of Unrepaired Errors
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Conclusion & Key Takeaways

  • DNA errors are rare but inevitable, with repair systems catching most mistakes.
  • Unrepaired errors drive diseases and evolution, highlighting replication’s dual role.
  • Research on error mechanisms aids cancer treatments and genetic engineering advances.
Conclusion & Key Takeaways
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