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Spontaneous and Induced Mutations

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 Repair

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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.
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Related Experiment Video

Updated: Nov 30, 2025

Measuring Microbial Mutation Rates with the Fluctuation Assay

Measuring Microbial Mutation Rates with the Fluctuation Assay

Published on: November 28, 2019

Hotspots of Human Mutation.

Alex V Nesta¹, Denisse Tafur², Christine R Beck³

¹Department of Genetics and Genome Sciences, University of Connecticut Health Center, Farmington, CT 06030, USA; The Jackson Laboratory for Genomic Medicine, Farmington, CT 06032, USA.

Trends in Genetics : TIG

|November 17, 2020

Summary

This summary is machine-generated.

Human genome mutations create variations like single nucleotide variants and structural variants (SVs). Understanding mutation hotspots and their mechanisms is key to comprehending disease and evolution.

Keywords:

DNA repair indel mutation hotspots recurrent mutation selection structural variation

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Last Updated: Nov 30, 2025

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Single Droplet Digital Polymerase Chain Reaction for Comprehensive and Simultaneous Detection of Mutations in Hotspot Regions

Single Droplet Digital Polymerase Chain Reaction for Comprehensive and Simultaneous Detection of Mutations in Hotspot Regions

Published on: September 25, 2018

Area of Science:

Genomics
Molecular Biology
Human Genetics

Background:

The human genome exhibits three primary classes of genomic variation: single nucleotide variants, short insertions/deletions, and large structural variants (SVs).
Mutations arise from both normal biological processes (e.g., meiotic recombination) and DNA damage/repair mechanisms.
These mutations are subject to evolutionary selection, with certain mutation hotspots linked to disease development.

Purpose of the Study:

To review genomic regions susceptible to mutation.
To elucidate the mechanisms underlying mutation susceptibility.
To discuss the processes driving mutation accumulation in normal and somatic cells.

Main Methods:

Literature review and synthesis of existing research on human genome mutation.
Analysis of mechanisms contributing to mutation hotspots.
Discussion of mutation accumulation in germline and somatic genomes.

Main Results:

Identified genomic regions prone to mutation.
Detailed various mechanisms contributing to mutation susceptibility.
Described processes leading to mutation accumulation in different cell types.

Conclusions:

Mutation hotspots are crucial for understanding human evolution and disease.
Further advancements in human genome sequencing will likely reveal more mutation hotspots and their formation mechanisms.
Investigating mutation hotspots offers insights into disease pathogenesis and evolutionary trajectories.