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Related Concept Videos

In vitro Mutagenesis01:16

In vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
Mutagenicity and Carcinogenicity01:25

Mutagenicity and Carcinogenicity

Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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).
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mutations01:39

Mutations

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Related Experiment Video

Updated: May 31, 2026

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
14:45

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency

Published on: August 6, 2014

New words in human mutagenesis.

Alexander Y Panchin1, Sergey I Mitrofanov, Andrei V Alexeevski

  • 1Department of Bioengineering and Bioinformatics, Moscow State University, Vorbyevy Gory 1-73, Moscow, 119992, Russian Federation. alexpanchin@yahoo.com

BMC Bioinformatics
|July 2, 2011
PubMed
Summary

New mutation hotspots were identified in human DNA sequences. These findings reveal novel nucleotide contexts influencing mutation rates, crucial for understanding genome evolution and cancer development.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Substitution rates in DNA vary based on nucleotide context.
  • CpG dinucleotides show a well-known excess of C to T mutations.
  • Understanding mutation biases is key to human genome evolution and cancer research.

Purpose of the Study:

  • To identify novel nucleotide contexts that significantly affect DNA mutation rates.
  • To enhance understanding of mutation acquisition and the existence of mutation hotspots.

Main Methods:

  • Compared inherited mutation rates across 1-4 bp nucleotide contexts.
  • Reconstructed ancestral states of human single nucleotide polymorphisms (SNPs) in intergenic regions.
  • Utilized chimpanzee and orangutan genomic sequences as outgroups.

Main Results:

  • Identified a 3.5-fold excess of T > C mutations in the ATTG context.
  • Observed a 3.3-fold excess of T > C mutations in the ATAG context.
  • Found a 3.4-fold excess of A > C mutations in the ACAA context.

Conclusions:

  • Discovered three novel 4 bp mutation contexts with significant mutation biases.
  • These biases, while less pronounced than CpG mutations, are distinct.
  • Further research is needed to elucidate the molecular mechanisms driving these observed mutation excesses.