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Related Concept Videos

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,...
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

Overview
Mutations01:39

Mutations

Overview
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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Related Experiment Video

Updated: Jun 18, 2026

Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
08:12

Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes

Published on: November 1, 2011

Mutation mechanisms.

Daniele Castiglia1, Giovanna Zambruno

  • 1Laboratory of Molecular and Cell Biology, IDI-IRCCS, Via dei Monti di Creta 104, 00167 Rome, Italy.

Dermatologic Clinics
|December 1, 2009
PubMed
Summary

Mutations are heritable DNA changes. This review explores how various mutations, from small point mutations to large gene rearrangements, can disrupt normal gene expression.

Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Mutations are fundamental to genetic variation and evolution.
  • Understanding mutation types is crucial for deciphering genetic disorders.
  • Gene expression is tightly regulated and susceptible to disruption.

Purpose of the Study:

  • To review the diverse types of mutations.
  • To explain the mechanisms by which mutations impact gene expression.
  • To provide a comprehensive overview of mutation-induced gene expression defects.

Main Methods:

  • Literature review of genetic mutation types.
  • Analysis of molecular mechanisms linking mutations to gene expression.
  • Synthesis of findings on point mutations and major DNA changes.

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Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches

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Related Experiment Videos

Last Updated: Jun 18, 2026

Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
08:12

Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes

Published on: November 1, 2011

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches
05:56

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches

Published on: October 13, 2022

Main Results:

  • Mutations encompass point mutations (nucleotide alterations) and major DNA changes (gene/segment loss, duplication, rearrangement).
  • Both small-scale and large-scale mutations can lead to altered protein production or function.
  • Specific mutation types have distinct effects on gene expression pathways.

Conclusions:

  • Heritable DNA alterations (mutations) significantly impact gene expression.
  • Diverse mutation types, including point and major DNA changes, can result in defective gene expression.
  • This review consolidates knowledge on mutation-driven gene expression dysregulation.