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Mutations

Mutations

Mutations

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...

Viral Mutations

Viral Mutations

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...

Leaky Scanning

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...

Effects of EDTA on End-Point Detection Methods

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...

Mutation, Gene Flow, and Genetic Drift

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: Feb 13, 2026

Competitive Genomic Screens of Barcoded Yeast Libraries

Competitive Genomic Screens of Barcoded Yeast Libraries

Published on: August 11, 2011

A cost-effective and scalable barcoded library construction method for deep mutational scanning studies.

Jessica Jann^1,2,3,4,5,6, Isabelle Gagnon-Arsenault^1,2,3,4,5,6, Alicia Pageau^1,2,3,4,5,6

¹Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec, Canada.

|February 11, 2026

Summary

We developed a cost-effective DNA synthesis method for creating gene variant libraries. This approach simplifies mutation characterization for long genes, advancing protein science research.

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Last Updated: Feb 13, 2026

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Area of Science:

Molecular Biology
Protein Science
Genomics

Background:

DNA synthesis and sequencing advancements enable gene variant library construction and functional analysis.
Characterizing mutations in long genes is technically and financially challenging, limiting comprehensive mutational studies.

Purpose of the Study:

To develop an efficient, affordable, and scalable method for constructing gene variant libraries.
To overcome the limitations of long-read sequencing for linking variants to barcodes in mutational studies.

Main Methods:

Utilized low-cost DNA synthesis and standard cloning techniques.
Integrated multiple DNA barcodes with each degenerate codon variant during synthesis.
Constructed a complete library for the 3.2 kb multidrug resistance gene PDR1 in Saccharomyces cerevisiae.

Main Results:

Demonstrated a scalable library construction approach for long genes.
Achieved a near-perfect correspondence between barcode sequencing and direct sequencing for assessing amino acid variant impact.
Successfully created a comprehensive variant library for the PDR1 gene.

Conclusions:

The developed method increases accessibility to mutational studies for long genes.
This approach advances the field of protein science by simplifying variant analysis.
Offers an efficient and affordable solution for constructing and analyzing gene variant libraries.