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Related Concept Videos

Mutations01:39

Mutations

Overview
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
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,...
Point and Frameshift Mutations01:30

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

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Related Experiment Video

Updated: May 12, 2026

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

Dynamic mutations: where are they now?

Clare L van Eyk1, Robert I Richards

  • 1Discipline of Genetics, School of Molecular and Biomedical Sciences, The University ofAdelaide, Adelaide, South Australia, Australia. clare.vaneyk@adelaide.edu.au

Advances in Experimental Medicine and Biology
|April 6, 2013
PubMed
Summary
This summary is machine-generated.

Dynamic mutations, caused by unstable DNA repeat expansions, lead to various genetic disorders. Research focuses on understanding these pathways to develop treatments for diseases like Huntington's disease and spinocerebellar ataxias.

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Last Updated: May 12, 2026

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Dynamic mutations arise from expansions of polymorphic DNA repeat sequences exceeding a threshold.
  • These mutations can cause dominant, recessive, or X-linked disorders depending on their genomic location.
  • The instability of these repeat sequences, influenced by copy number, occurs during meiosis or mitosis.

Purpose of the Study:

  • To provide an overview of diseases caused by dynamic mutations.
  • To explore the pathogenic mechanisms linking these mutations to disease symptoms.
  • To identify potential therapeutic strategies for delaying disease onset or progression.

Main Methods:

  • Review of existing literature on dynamic mutations and associated diseases.
  • Analysis of the relationship between repeat copy number and disease phenotype (age-at-onset, severity).
  • Examination of the molecular pathways involved in dynamic mutation pathogenesis.

Main Results:

  • A comprehensive list of neurodegenerative and neuromuscular diseases caused by dynamic mutations is presented.
  • The correlation between repeat copy number and disease characteristics is highlighted for several conditions.
  • The instability of repeat sequences is identified as a key feature influencing disease development.

Conclusions:

  • Dynamic mutations represent a significant class of genetic disorders with a wide range of clinical manifestations.
  • Understanding the mutation-to-disease pathway is crucial for developing targeted therapies.
  • Further research into pathogenic mechanisms holds promise for mitigating the impact of these debilitating diseases.