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Related Concept Videos

Genome Copying Errors02:46

Genome Copying Errors

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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.
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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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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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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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Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

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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).
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Background Mutation Frequencies in TK6 and L5178Y Cells: Implications for Error-Corrected Sequencing.

Jaime A Miranda1, Azra Dad1, Xuewei Qu1

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Environmental and Molecular Mutagenesis
|July 15, 2025
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Summary

Background mutations in cell cultures can skew results from error-corrected sequencing (ECS) used for mutagenicity testing. Using fresh cell clones minimizes this issue, improving the accuracy of mutagenicity assessments.

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Area of Science:

  • Genomics and Molecular Biology
  • Toxicology and Mutagenesis

Background:

  • Error-corrected sequencing (ECS) methods are crucial for detecting ultralow-frequency mutations and assessing mutagenicity.
  • Spontaneous mutations accumulating in immortalized cell cultures can elevate background mutation frequencies (MFs), potentially confounding ECS results.
  • Commercially available TK6 and L5178Y cell populations exhibit higher background MFs compared to freshly derived clonal populations.

Purpose of the Study:

  • To investigate the impact of background mutations in commercially available cell lines on ECS-based mutagenicity assessments.
  • To compare the performance of commercially available cell populations versus freshly derived clonal populations in ECS experiments.
  • To evaluate the influence of different data analysis approaches on interpreting ECS results in the presence of background mutations.

Main Methods:

  • Genomic comparison of single-cell-derived clones with parental TK6 and L5178Y cell cultures to identify unique mutations.
  • Culturing commercially available and freshly derived TK6 cell populations with varying concentrations of the in vitro mutagen N4-hydroxycytidine.
  • Analysis of mutagenicity using HiFi sequencing, an ECS method, and application of both relative and absolute mutation frequency change analyses.

Main Results:

  • Commercially available TK6 and L5178Y cell populations showed significantly higher background MFs (9 × 10⁻⁷ and 6 × 10⁻⁷ mut/bp) than freshly derived clones (0.5 × 10⁻⁷ and 1 × 10⁻⁷ mut/bp).
  • Freshly derived clonal TK6 populations exhibited lower background MFs and greater relative fold increases in MFs upon mutagen exposure compared to commercial populations.
  • An absolute MF change analysis approach provided more comparable results between commercial and clonal cell populations than relative fold increase analysis.

Conclusions:

  • Elevated background MFs in commercially available cell lines can impact the interpretation of in vitro ECS mutagenicity experiments.
  • Freshly derived clonal cell populations offer a more reliable baseline for ECS-based mutagenicity assessments due to lower background MFs.
  • The choice of data analysis method (relative vs. absolute MF changes) can influence the comparability of results across different cell population types.