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Related Concept Videos

Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...

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Related Experiment Video

Updated: Jul 8, 2026

Pyrosequencing: A Simple Method for Accurate Genotyping
13:06

Pyrosequencing: A Simple Method for Accurate Genotyping

Published on: January 8, 2008

Pyrobayes: an improved base caller for SNP discovery in pyrosequences.

Aaron R Quinlan1, Donald A Stewart, Michael P Strömberg

  • 1Department of Biology, Boston College, 140 Commonwealth Avenue, Chestnut Hill, Massachusetts 02467, USA.

Nature Methods
|January 15, 2008
PubMed
Summary

Pyrobayes software improves the accuracy of single-nucleotide polymorphism discovery from pyrosequencing data. This new base calling program enables reliable results even with shallow sequence coverage, overcoming previous limitations.

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Pyrosequencing: A Simple Method for Accurate Genotyping
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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
07:24

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Area of Science:

  • Genomics
  • Bioinformatics

Background:

  • Pyrosequencing technology often requires deep coverage for accurate polymorphism discovery due to insertion/deletion errors.
  • Previous methods were limited by the accuracy of native base calling programs.

Purpose of the Study:

  • To introduce Pyrobayes, a novel base calling program for pyrosequencing reads.
  • To enable accurate single-nucleotide polymorphism (SNP) calling in resequencing applications with reduced sequence coverage.

Main Methods:

  • Development of a new base calling algorithm named Pyrobayes.
  • Application of Pyrobayes to pyrosequencing data analysis.

Main Results:

  • Pyrobayes significantly enhances the accuracy of SNP calling compared to native programs.
  • Accurate SNP detection is achievable even with shallow read coverage.

Conclusions:

  • Pyrobayes offers a more confident base calling approach for pyrosequencing.
  • This advancement facilitates more efficient and accurate genetic variation analysis.