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Related Concept Videos

Mutations01:39

Mutations

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Mutations01:35

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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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Overview of DNA Repair02:25

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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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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[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

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The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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Related Experiment Video

Updated: Feb 5, 2026

Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations
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MAPINS, a Highly Efficient Detection Method That Identifies Insertional Mutations and Complex DNA Rearrangements.

Huawen Lin1, Paul F Cliften1, Susan K Dutcher2

  • 1Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110.

Plant Physiology
|September 13, 2018
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Summary

MAPINS, a new computational tool, efficiently maps DNA insertion sites in Chlamydomonas reinhardtii. This method accurately identifies genetic alterations, aiding in the characterization of insertional mutants for biological research.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Algal Biology

Background:

  • Insertional mutagenesis is crucial for generating mutants with desired phenotypes.
  • Chlamydomonas reinhardtii serves as a model organism for biological studies.
  • Accurate identification of DNA insertion sites is essential for characterizing mutants.

Purpose of the Study:

  • To develop a computational algorithm, MAPINS, for efficient identification of DNA insertion sites.
  • To validate the accuracy and efficiency of MAPINS in Chlamydomonas reinhardtii.
  • To investigate the complexity of genomic rearrangements in insertional mutants.

Main Methods:

  • Development of the MAPINS computational algorithm.
  • Whole-genome sequencing of paromomycin-resistant Chlamydomonas strains.
  • Experimental verification of insertion sites using meiotic analysis and molecular markers.

Main Results:

  • MAPINS identified 41 insertion sites with 93% experimental verification.
  • Insertion sites consistently cosegregated with paromomycin resistance and mutant phenotypes.
  • Evidence of complex genomic rearrangements was found in five strains, impacting three APHVIII insertion sites.

Conclusions:

  • MAPINS is a low-cost, efficient method for characterizing insertional mutants in Chlamydomonas.
  • Insertional mutagenesis in Chlamydomonas can lead to more complex genomic alterations than previously assumed.
  • The findings facilitate a deeper understanding of genetic manipulation in this model organism.