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Related Concept Videos

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Sanger Sequencing01:57

Sanger Sequencing

DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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Pyrosequencing: A Simple Method for Accurate Genotyping
13:06

Pyrosequencing: A Simple Method for Accurate Genotyping

Published on: January 8, 2008

A virtual pyrogram generator to resolve complex pyrosequencing results.

Guoli Chen1, Matthew Theodore Olson, Alan O'Neill

  • 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

The Journal of Molecular Diagnostics : JMD
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

Pyromaker is a free software tool that generates simulated pyrosequencing results, aiding in the analysis of complex genetic mutations. This tool helps accurately identify mutations in genes like KRAS, BRAF, GNAS, and p53.

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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Area of Science:

  • Bioinformatics
  • Genetics
  • Molecular Biology

Background:

  • Pyrosequencing is a valuable technique for genetic mutation detection.
  • Analyzing complex pyrosequencing results, especially for mutations in genes like KRAS, BRAF, GNAS, and p53, can be challenging.
  • Distinguishing between single-base and complex mutations requires sophisticated analytical tools.

Purpose of the Study:

  • To introduce Pyromaker, a freely available software program for generating simulated pyrosequencing traces.
  • To demonstrate the utility of simulated pyrograms in analyzing and identifying complex genetic mutations.
  • To validate Pyromaker's performance using known mutations in KRAS, BRAF, GNAS, and p53 genes.

Main Methods:

  • Pyromaker software was developed to generate simulated pyrograms based on user inputs.
  • The software was validated against actual pyrosequencing data for various gene mutations.
  • Two analysis strategies were employed: hypothesis-based pattern matching and iterative pyrogram reconstruction.

Main Results:

  • Pyromaker successfully generated unique simulated traces for all 18 possible single-base mutations in KRAS codons 12 and 13.
  • All complex mutations in KRAS codons 12 and 13 produced unique pyrograms, though some were indistinguishable from single-base mutations.
  • Both analysis strategies using Pyromaker successfully identified complex mutations, confirmed by cloning and sequencing.

Conclusions:

  • Pyromaker is an effective tool for analyzing complex pyrosequencing data and identifying genetic mutations.
  • The software aids in distinguishing between various mutation types, enhancing diagnostic accuracy.
  • Pyrosequencing combined with Pyromaker offers an efficient approach for unambiguous mutation identification.