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Related Concept Videos

Point and Frameshift Mutations01:30

Point and Frameshift Mutations

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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...
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Mutations in Microorganisms01:18

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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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Mutations01:39

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Overview
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Mutations01:35

Mutations

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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.
Chromosomal Alterations Are Large-Scale Mutations
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Viral Mutations00:36

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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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: Feb 10, 2026

The Lambda Select cII Mutation Detection System
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Mutations in SOX2 cause anophthalmia.

Judy Fantes1, Nicola K Ragge, Sally-Ann Lynch

  • 1MRC Human Genetics Unit, Western General Hospital, Edinburgh EH4 2XU, UK.

Nature Genetics
|March 4, 2003
PubMed
Summary

SOX2 gene mutations are linked to bilateral anophthalmia, a rare congenital condition. This study found de novo SOX2 mutations in 11% of anophthalmia cases, highlighting its critical role in eye development.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Ophthalmology

Background:

  • Anophthalmia is a severe congenital eye malformation.
  • The SOX2 gene is crucial for early eye development.
  • Genetic factors play a significant role in anophthalmia.

Purpose of the Study:

  • To investigate the role of the SOX2 gene in patients with anophthalmia.
  • To identify SOX2 mutations in individuals diagnosed with anophthalmia.

Main Methods:

  • Genetic analysis of the SOX2 gene.
  • Karyotyping and breakpoint analysis (t(3;11)(q26.3;p11.2)).
  • Screening for SOX2 mutations in a cohort of 35 anophthalmia patients.

Main Results:

  • A submicroscopic deletion encompassing SOX2 was found at the 3q breakpoint in a patient with bilateral anophthalmia and a t(3;11) translocation.
  • De novo SOX2 mutations were identified in 4 out of 35 (11%) individuals with anophthalmia.
  • All patients with identified SOX2 mutations presented with bilateral anophthalmia.

Conclusions:

  • SOX2 mutations are a significant cause of bilateral anophthalmia.
  • Genetic alterations in SOX2 are critical for normal eye development.
  • Early genetic screening for SOX2 mutations can aid in diagnosing anophthalmia.