Haplotypes
Haplotypes - 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...
07:12
Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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2023
This protocol provides a rapid method for determining pollen compatibility and incompatibility in citrus cultivars.
08:03
Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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2021
This analytical computational platform provides practical guidance for microbiologists, ecologists, and epidemiologists interested in bacterial population genomics. Specifically, the work presented here demonstrated how to perform: i) phylogeny-guided mapping of hierarchical genotypes; ii) frequency-based analysis of genotypes; iii) kinship and clonality analyses; iv) identification of lineage differentiating accessory loci.
10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Cited by 2 •
2010
Genetic associations often remain unexplained at a functional level. This method aims to assess the effect of phenotype-associated genetic markers on gene expression by analyzing cells heterozygous for transcribed SNPs. The technology allows accurate measurement by MALDI-TOF mass spectrometry to quantify allele-specific primer extension products.
FAQs
Nearby alleles tend to remain associated because meiotic recombination is less likely to occur between variants that are close together on the same chromosome. As a result, a recurring pattern can be transmitted across generations with limited disruption. This persistence allows researchers to follow a surrounding genomic region through families or populations, even when the relevant disease-associated signal is indirect.
Considering a combination of linked variants can provide more context than evaluating a single allele in isolation. The pattern may act as a marker for a nearby genomic region and can reveal inherited variation that a single measured variant does not capture. In clinical research, this broader view supports comparisons of disease-associated loci, inherited risk, and population variation.
If a causal mutation is difficult to measure directly, researchers can compare haplotype patterns associated with the surrounding region. A consistent association may identify the genomic neighborhood in which the clinically relevant mutation lies, even if the haplotype itself is not the cause. This approach helps narrow interpretation from an observable inherited pattern to a potentially important locus.
Because linked variant patterns can persist across generations, their frequencies and distributions provide a way to compare inherited variation among populations. Such comparisons can show whether particular genomic patterns are shared or differ between groups. In clinical research, this context helps researchers interpret disease-associated loci and understand how genetic findings relate to broader patterns of population variation.
A haplotype analysis examines linked variant patterns and compares how those patterns relate to a clinical or population feature. Depending on the research question, the comparison may focus on a disease-associated locus, inherited risk, variation among populations, or differences in treatment response. The outcome is an association between a haplotype pattern and the feature being studied, not necessarily proof that every variant is causal.
Researchers compare haplotypes carried by individuals or groups to assess whether particular inherited patterns track with disease-associated loci or risk. Because the pattern reflects linked variation across a region, it can provide information when the causal mutation is not directly measured. This makes haplotype analysis useful for tracing inherited signals in clinical research rather than treating risk as a single-variant question.
Treatment response can be studied in relation to inherited haplotype patterns, allowing researchers to examine whether linked genetic variation corresponds with different responses. This is relevant to pharmacogenomics, where genetic information supports investigation of treatment-related differences. The analysis can capture a regional pattern rather than focusing only on one variant, providing a broader basis for studying response-associated genetic variation.