Site Directed Mutagenesis
Site Directed Mutagenesis - Related Videos
09:01
Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Cited by 12 •
2011
Here we demonstrate a simple protocol to create a random mutant library for a given target sequence. We show how this method, which is performed in vivo in Escherichia coli, can be coupled with functional selections to evolve new enzymatic activities.
07:11
Homemade Site Directed Mutagenesis of Whole Plasmids
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Cited by 91 •
2009
Site directed mutagenesis of whole plasmids is a simple way to create slightly different variations of an original plasmid. Here we demonstrate an easy and cost effective way to introduce base substitutions into a plasmid using standard reagents.
13:18
Single Oocyte Bisulfite Mutagenesis
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Cited by 14 •
2012
Bisulfite mutagenesis is the gold standard for analyzing DNA methylation. Our modified protocol allows for DNA methylation analysis at the single-cell level and was specifically designed for individual oocytes. It can also be used for cleavage-stage embryos.
04:51
Optogenetic Random Mutagenesis Using Histone-miniSOG in C. elegans
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Cited by 6 •
2016
Genetically-encoded histone-miniSOG induces genome-wide heritable mutations in a blue light-dependent manner. This mutagenesis method is simple, fast, free of toxic chemicals, and well-suited for forward genetic screening and transgene integration.
10:44
An Introduction to Worm Lab: from Culturing Worms to Mutagenesis
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Cited by 27 •
2011
Screening for mutants with phenotypic defects is a straightforward method for identifying genes that function in a given biological process. In this article we describe how to culture free living worms (e.g., Pristionchus pacificus) in the laboratory and show two different mutagenesis methods, EMS and TMP/UV.
FAQs
Complementary primers carry the desired sequence alteration and provide the design information used during polymerase chain reaction amplification. As the plasmid is amplified, the altered primer sequence becomes associated with the resulting DNA. This allows researchers to target a particular nucleotide, codon, or regulatory element rather than changing the sequence broadly.
Selective removal distinguishes the newly amplified DNA carrying the planned alteration from the original, unchanged plasmid template. Without this separation, the parental sequence could remain part of the material introduced into host cells, making it harder to identify DNA that reflects the intended change. The step therefore supports recovery of the designed mutant sequence.
Changing an individual nucleotide can test the effect of a specific base, while altering a codon can examine how a protein sequence relates to its function. Targeting a regulatory element instead focuses on gene control. Comparing these changes with resulting biological measurements helps connect a defined DNA feature to protein behavior, regulation, or phenotype.
Sequence verification confirms whether the recovered DNA contains the intended alteration before researchers interpret its biological effects. This is important because conclusions about protein structure, enzyme activity, gene regulation, or a disease-associated variant depend on knowing which sequence was actually introduced. Verification therefore links the planned molecular change to subsequent experimental observations.
A typical workflow begins by designing complementary primers that contain the desired mutation and using them to amplify a plasmid by polymerase chain reaction. The parental template is then selectively removed, and the amplified DNA is introduced into host cells for replication. Researchers finally verify the sequence before examining its biological consequences.
The method is useful when researchers need to test the contribution of one defined sequence feature to a measurable outcome. Applications include examining protein structure and function, investigating enzyme activity, analyzing gene regulation, and studying disease-associated variants. By comparing outcomes associated with planned sequence changes, investigators can evaluate causal relationships in genetic and biochemical systems.