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Related Concept Videos

Genome Copying Errors02:46

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
Mismatch Repair01:20

Mismatch Repair

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.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Mismatch Repair

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Mismatch Repair01:36

Mismatch Repair

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Mutations in Microorganisms01:18

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Mutator phenotypes due to DNA replication infidelity.

Mercedes E Arana1, Thomas A Kunkel

  • 1Laboratory of Molecular Genetics and Laboratory of Structural Biology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA.

Seminars in Cancer Biology
|October 12, 2010
PubMed
Summary

DNA replication fidelity in eukaryotes varies based on DNA polymerase, error type, and DNA repair. Defects in these processes can lead to mutations, revealing the molecular basis of the defect.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication is crucial for nuclear genome integrity in eukaryotes.
  • The accuracy of DNA replication, known as fidelity, is essential to prevent mutations.
  • Eukaryotic DNA polymerases are the primary enzymes responsible for replicating the nuclear genome.

Purpose of the Study:

  • To examine the fidelity of DNA replication performed by eukaryotic DNA polymerases.
  • To understand the factors influencing DNA replication fidelity.
  • To explore the consequences of impaired DNA replication fidelity.

Main Methods:

  • Review of existing literature on eukaryotic DNA polymerases.
  • Analysis of factors affecting DNA replication error rates.
  • Examination of the relationship between fidelity defects and mutator phenotypes.

Main Results:

  • DNA replication fidelity is highly variable, influenced by the specific DNA polymerase.
  • Error composition, flanking DNA sequences, and DNA damage significantly impact fidelity.
  • The presence and efficiency of DNA error correction mechanisms are critical determinants of fidelity.

Conclusions:

  • Defects in DNA replication fidelity processes can result in strong mutator phenotypes.
  • The specificity of these mutator phenotypes can provide insights into the molecular nature of the underlying defect.
  • Understanding DNA replication fidelity is key to comprehending genome stability and mutation processes.