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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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Self-Internal-Reference Probe System for Control-Free Quantification of Mutation Abundance.

Xiaofeng Tang¹, Xin Chen¹, Yangwei Liao¹

¹Institute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, P. R. China.

Analytical Chemistry

|September 21, 2021

Summary

This study introduces a novel self-internal-reference probe system for precise mutation abundance measurement. This method eliminates the need for negative controls and analyte quantification, simplifying cancer mutation detection and noninvasive prenatal testing.

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Area of Science:

Biotechnology
Molecular Biology
Genetics

Background:

Gene mutations are critical biomarkers for diagnosing and monitoring cancers and genetic diseases.
Accurate mutation abundance determination is essential for personalized cancer therapies and noninvasive prenatal testing (NIPT).
Current quantification methods rely on relative quantification, requiring negative samples and strict analyte control, posing limitations.

Purpose of the Study:

To develop a DNA-probe-based method for accurate mutation abundance determination independent of sample size.
To overcome the limitations of existing relative quantification techniques.
To enable precise mutation detection without negative samples or analyte amount control.

Main Methods:

Designed a self-internal-reference probe system with a theoretical model to guide probe design.
Incorporated quantitative corrections using an internal reference to eliminate substrate amount influence.
Applied the system to analyze unquantified polymerase chain reaction (PCR) products.

Main Results:

The self-internal-reference probe system demonstrated the ability to measure mutation abundance accurately.
The theoretical model successfully guided probe design, ensuring independence from targeted DNA strand numbers.
Quantitative corrections effectively removed the influence of substrate amount on test results.

Conclusions:

The developed self-internal-reference probe system offers a robust solution for mutation abundance quantification.
This innovative approach simplifies workflows by omitting purification and quantification steps for PCR amplicons.
The system shows significant potential for applications in cancer mutation detection and noninvasive prenatal testing.