Snp Detection
Snp Detection - Related Videos
08:23
SNP Genotyping
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2023
Single nucleotide polymorphisms, or SNPs, are the most common form of genetic variation in humans. These differences at individual bases in the DNA often do not directly affect gene expression, but in many cases can still be useful for locating disease-associated genes or for diagnosing patients. Numerous methodologies have been established to identify, or “genotype”, SNPs.JoVE’s introduction to SNP Genotyping begins by discussing what SNPs are and how they can be used to identify...
13:33
Infinium Assay for Large-scale SNP Genotyping Applications
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Cited by 15 •
2013
A protocol is described that uses Illumina's Infinium assays to perform large-scale genotyping. These assays can reliably genotype millions of SNPs across hundreds of individual DNA samples in three days. Once generated, these genotypes can be used to check for associations with a variety of different diseases or phenotypes.
06:18
Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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2025
This protocol provides a method for measuring crossover frequencies and distribution during meiosis in Caenorhabditis elegans. Single-nucleotide polymorphism genotyping with real-time PCR was used to determine the origin of the chromosomes. The 4-point mapping allowed to determine the crossover distributions of the left-arm, center, and right-arm regions of each chromosome. ...
09:10
Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce
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Cited by 17 •
2010
This protocol describes a simple adhesive-tape-based approach for sampling of tomato and other fresh produce surfaces, followed by rapid whole cell detection of Salmonella using fluorescence in situ hybridization (FISH).
09:00
Detection of Protein Ubiquitination
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Cited by 96 •
2009
Ubiquitination is a key posttranslational modification carried out by a set of three enzymes. Mutations of genes involved in this modification are associated with many different human diseases. Here, we describe protocols to detect protein ubiquitination in cultured cells in vivo and test tubes in vitro.
FAQs
Allele discrimination depends on sequence-specific recognition at the nucleotide position that differs between variants. A probe or primer can produce a signal when its sequence pairs appropriately with one allele but not the alternative. This selective pairing converts a one-base sequence difference into a measurable result, allowing the assay to separate possible genotypes.
Sequencing distinguishes alleles through nucleotide incorporation as the DNA sequence is read, whereas PCR or hybridization methods detect allele-specific amplification or binding signals. These approaches therefore use different forms of evidence: sequencing compares the resulting sequence information, while targeted assays infer the allele from whether a designed reaction or probe recognizes it.
A reference sequence provides the comparison point needed to identify whether a patient’s sequence contains a one-base difference. The result is not interpreted from an isolated signal alone; it is evaluated against the expected reference or against alternative allele-specific signals. This comparison supports consistent classification of sequence variation for later clinical or research analysis.
A typical workflow begins by examining the patient’s relevant DNA sequence or testing it with an allele-specific system. The selected approach may use PCR, hybridization probes, or DNA sequencing. Researchers then interpret amplification, probe-binding, or sequence-incorporation results to determine which allele is present and relate that finding to the question being studied.
In medicine, the approach can support genetic diagnosis, pharmacogenomics, risk assessment, and investigations of inherited traits. It is especially relevant when a genetic difference has been linked with disease susceptibility or treatment response. By identifying the patient’s allele, testing can contribute to decisions or analyses concerned with variation in clinical outcomes.
Individual testing connects a patient’s allele with inherited traits, disease susceptibility, or response to treatment. At the population level, comparing variants across groups helps researchers examine how genetic differences relate to clinical outcomes and inherited patterns. These complementary uses make SNP detection relevant both to personalized medicine and to broader studies of human variation.