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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...

Mutations

Mutations

From DNA to Protein

From DNA to Protein

The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...

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...

Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Related Experiment Video

Updated: Apr 22, 2026

A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing

A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing

Published on: July 3, 2016

Codon compression algorithms for saturation mutagenesis.

Gur Pines¹, Assaf Pines, Andrew D Garst¹

¹†Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States.

ACS Synthetic Biology

|October 11, 2014

Summary

This summary is machine-generated.

This study introduces a dynamic codon compression method for saturation mutagenesis, reducing library redundancy and improving efficiency in protein engineering and genome editing. The approach optimizes codon usage for precise amino acid targeting.

Keywords:

CRISPR selection codon redundancy codon usage genome editing library size saturation mutagenesis

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Area of Science:

Molecular Biology
Protein Engineering
Synthetic Biology

Background:

Saturation mutagenesis is crucial for protein engineering and genome editing, generating diverse amino acid libraries.
Traditional methods using degenerate codons like NNK lead to redundancy, increasing library size and screening efforts.
Redundancies arise from multiple codons for one amino acid and inclusion of wild-type sequences.

Purpose of the Study:

To develop a dynamic codon compression approach for saturation mutagenesis.
To minimize redundancy in generated protein variant libraries.
To enhance the efficiency of protein engineering and genome editing workflows.

Main Methods:

A dynamic codon compression strategy was developed, considering codon usage bias.
The method generates unique codon collections for desired amino acid lists.
Oligonucleotide libraries were designed using this approach for recombineering and CRISPR editing.

Main Results:

The dynamic approach effectively compresses codons for specific amino acid sets.
It significantly reduces library redundancy compared to traditional methods.
Designed libraries were successfully used in recombineering and CRISPR-based genome editing.

Conclusions:

The novel codon compression method offers a more efficient way to create saturation mutagenesis libraries.
This approach streamlines protein engineering and genome editing by reducing library complexity.
It enables the generation of diverse, high-efficiency mutant populations.