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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...

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).

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

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Related Experiment Video

Updated: Feb 11, 2026

Analysis of Cancer Cell Invasion and Anti-metastatic Drug Screening Using Hydrogel Micro-chamber Array HMCA-based Plates

Analysis of Cancer Cell Invasion and Anti-metastatic Drug Screening Using Hydrogel Micro-chamber Array HMCA-based Plates

Published on: October 25, 2018

Highly sensitive mutation detection based on digital amplification coupled with hydrogel bead-array.

Huan Huang¹, Zongtai Qi, Lili Deng

¹Huadong Research Institute for Medicine and Biotechnics, Nanjing 210002, China.

Chemical Communications (Cambridge, England)

|July 2, 2009

Summary

This summary is machine-generated.

We developed a new method for early cancer diagnosis using amplicon-coated microbeads and single-molecule PCR. This technique enhances the detection of minute mutant quantities for improved diagnostic accuracy.

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Last Updated: Feb 11, 2026

Analysis of Cancer Cell Invasion and Anti-metastatic Drug Screening Using Hydrogel Micro-chamber Array HMCA-based Plates

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Published on: October 25, 2018

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Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations

Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations

Published on: March 29, 2017

Area of Science:

Biotechnology
Molecular Biology
Cancer Research

Background:

Early cancer diagnosis relies on detecting minute quantities of specific mutations.
Existing methods face challenges in sensitivity and specificity for early-stage detection.

Purpose of the Study:

To develop a novel, highly sensitive method for detecting small amounts of mutants for early cancer diagnosis.
To integrate amplicon-coated microbeads, single-molecule PCR, and a hydrogel bead-array detection platform.

Main Methods:

Utilized amplicon-coated microbeads for target molecule capture.
Employed single-molecule PCR within water-in-oil emulsions to amplify target DNA.
Developed a hydrogel bead-array, a 3-D polyacrylamide gel network, for bead immobilization and detection.

Main Results:

The novel method demonstrates high sensitivity in detecting small amounts of mutants.
The integrated platform allows for efficient immobilization and detection of microbeads.
This approach shows promise for early cancer detection applications.

Conclusions:

The developed method offers a significant advancement in sensitive mutant detection for early cancer diagnosis.
The combination of single-molecule PCR and hydrogel bead-array technology provides a robust platform for molecular diagnostics.
This technique has the potential to improve patient outcomes through earlier and more accurate cancer detection.