Single Nucleotide Polymorphism Analysis
Single Nucleotide Polymorphism Analysis - Related Videos
01:05
Single Nucleotide Polymorphisms-SNPs
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2021
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,...
07:24
Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Cited by 6 •
2023
Pyrosequencing assays enable the robust and rapid genotyping of mitochondrial DNA single nucleotide polymorphisms in heteroplasmic cells or tissues.
10:01
The Visual Colorimetric Detection of Multi-nucleotide Polymorphisms on a Pneumatic Droplet Manipulation Platform
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Cited by 2 •
2016
This work presents a simple and visual method to detect multi-nucleotide polymorphisms on a pneumatic droplet manipulation platform. With the proposed method, the entire experiment, including droplet manipulation and detection of multi-nucleotide polymorphisms, can be performed near 23 °C without the aid of advanced instruments.
10:27
Methods to Increase the Sensitivity of High Resolution Melting Single Nucleotide Polymorphism Genotyping in Malaria
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Cited by 10 •
2015
While high resolution melting analysis offers the ability to differentiate between single nucleotide polymorphisms in a heterogeneous population, mutant allele amplification bias can increase its ability to detect alleles present at relatively low percentages within a sample. This protocol describes improvements that improve the sensitivity of high resolution melting analysis.
06:21
Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform
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2024
This protocol proposes holistic laboratory procedures required to detect single nucleotide polymorphisms in gastric cancer samples based on an ion semiconductor sequencing platform. The target sequences, ligating adapters, library amplification and purification, and quality control criteria are also described in detail.
FAQs
Analysis begins with a targeted DNA sequence and focuses on a defined genomic position. PCR can amplify the region, allele-specific probes can distinguish alternative bases, genotyping arrays can survey selected variants, and DNA sequencing can read the nucleotide directly. Comparing the resulting sequence or signal reveals which allele is present for each sample.
Examining a defined position allows investigators to compare the same genetic feature across individuals or populations. Those comparisons can expose host variants associated with differences in immune responses, susceptibility to pathogens, disease severity, or treatment outcomes. The value comes from linking the observed nucleotide difference with a clearly defined immunological or infectious-disease phenotype.
Host-genome analysis examines variants that may correspond to differences in immune responses, susceptibility to pathogens, disease severity, or treatment outcomes. Pathogen-genome analysis instead uses SNP profiles to support strain tracking and transmission studies. Separating these two uses helps researchers interpret whether a genetic pattern describes variation in the infected person or in the infectious agent.
A basic workflow starts by choosing a targeted sequence and the genomic position to compare. Investigators then apply a suitable detection approach, such as PCR, allele-specific probes, a genotyping array, or DNA sequencing. The resulting base identifications are compared across samples, allowing researchers to relate genetic variation to the immune or infection-related question under study.
These methods differ in how they interrogate the DNA. PCR addresses a targeted sequence, allele-specific probes distinguish bases at selected positions, genotyping arrays examine selected variants, and DNA sequencing determines the nucleotide sequence. The appropriate readout therefore depends on whether the investigation centers on a focused position or on comparisons involving multiple selected genetic variants.
Findings can connect genetic variation with measurable questions in immunology and infection. Host SNP results may support studies of immune responses, pathogen susceptibility, disease severity, and treatment outcomes, while pathogen profiles can contribute to strain tracking and transmission research. At a broader level, these data strengthen genetic association studies and can inform personalized approaches to infectious disease research.