Genotyping Method
Genotyping Method - Related Videos
13:06
Pyrosequencing: A Simple Method for Accurate Genotyping
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Cited by 22 •
2008
Pyrosequencing(R) is one of the most thorough yet simple methods to date used to analyze polymorphisms. This method has led to rapid and efficient single-nucleotide polymorphism evaluation including many clinically relevant polymorphisms. The technique and methodology of Pyrosequencing is explained.
08:27
Mouse Genotyping
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2023
Even though the human genome was mapped over 10 years ago, scientists are still far from understanding the function of every human gene! One way to evaluate how a gene functions is to disrupt the sequence encoding it and then evaluate the impact of this change (the phenotype) on the animal’s biology. This approach is commonly used in the mouse (Mus musculus), since it shares a high degree of genetic similarity with humans. To track the animals bearing genetic changes over several generations,...
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...
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.
11:15
Ice-Cap: A Method for Growing Arabidopsis and Tomato Plants in 96-well Plates for High-Throughput Genotyping
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Cited by 4 •
2011
The Ice-Cap method allows one to grow plants in 96-well plates and non-destructively harvest root tissue from each seedling. DNA extracted from this root tissue can be used for genotyping reactions. We have found that Ice-Cap works well for Arabidopsis thaliana, tomato, and rice seedlings.
FAQs
Polymerase chain reaction amplifies selected DNA regions, producing enough target material for subsequent analysis. This is useful when the genetic difference of interest lies within a defined region and the method does not require determining an entire sequence. The amplified material can then be assessed using sequence-specific markers or compared with reference genotypes to identify the carried variant.
Sequence-specific markers distinguish genetic variants by targeting nucleotide differences associated with particular alleles. Their value depends on how clearly the marker separates the alternatives being examined. In biological studies, these markers can provide a focused way to identify inherited variants, compare organisms, or examine disease-associated genetic differences without relying on broader genetic characterization.
DNA sequencing is appropriate when the study requires nucleotide-level information rather than detection of a predefined marker alone. The choice depends on the target and the resolution required by the research question. Greater sequence detail can support more precise comparisons with reference genotypes, whereas targeted amplification or marker analysis may be sufficient for a narrower variant assessment.
Observed genetic differences are compared with reference genotypes to determine which alleles or variants an organism carries. This comparison provides the basis for assigning a molecular profile and recognizing similarities or differences among samples. Interpretation can then support analyses of inheritance, genetic diversity, disease-associated variation, or links between genotype and phenotype.
A typical workflow selects a genetic target, applies an appropriate analysis strategy, and evaluates the resulting variant information against reference genotypes. Depending on the question, the strategy may include PCR amplification, sequence-specific marker detection, or DNA sequencing. The final comparison produces genotype information that can be used for biological interpretation or diagnosis.
Genotyping reveals which alleles organisms carry, allowing researchers to examine how variants are transmitted and distributed. Across groups, the resulting molecular profiles can be used to study genetic diversity and population structure. These analyses help connect patterns of genetic variation with biological relationships, while also supporting evolutionary analysis and breeding research.
Genotyping information supports breeding decisions, evolutionary analysis, pathogen tracking, and personalized medicine. It can also help investigate disease-associated variants and responses to environmental conditions. By connecting molecular profiles with observable traits or biological outcomes, researchers can evaluate how genetic variation contributes to phenotype and use that information in research or diagnosis.