Genetic Polymorphisms
Genetic Polymorphisms - Related Videos
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.
10:47
An Overview of Genetics and Disease
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2023
Many human diseases are associated with mutations or variations in genetic sequences. Some of these genetic variants are heritable, passed down from generation to generation, while others arise sporadically during an organism’s life and cause diseases such as cancer. Researchers are trying to identify and characterize these genetic alterations in the hopes of improving diagnosis and therapeutic options for patients.In this video, we will examine the history of genetic disease research, and...
07:26
High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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Cited by 9 •
2017
Here, we describe an innovative method to determine complement receptor 1 (CR1) length polymorphisms for use in several applications, particularly the assessment of susceptibility to diseases such as Alzheimer's disease (AD). This method could be useful to better understand the role of CR1 isoforms in the pathogenesis of AD.
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.
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,...
FAQs
A variant can affect gene regulation rather than the protein itself. Changes in regulatory activity may alter how much of a gene is expressed, where it is active, or when it is activated. These expression differences can contribute to variation in disease susceptibility or other clinical traits, making regulatory polymorphisms important alongside changes that alter protein structure.
These variant types can influence biology through different molecular consequences. Single-nucleotide polymorphisms alter one DNA position, whereas insertions and deletions add or remove sequence, and copy-number changes alter the number of gene copies. Their clinical effects may involve gene expression, protein structure, or regulatory activity, depending on the affected gene and surrounding context.
The same variant may not produce an identical outcome in every individual because its effects can depend on the gene, tissue, surrounding genetic background, and environmental conditions. This context helps explain why a polymorphism may be associated with disease susceptibility or treatment response in some circumstances but show a different clinical relationship in others.
Clinical research examines whether particular variants are associated with differences in disease susceptibility or clinical traits. Interpretation requires relating the variant to its gene, potential effects on expression or protein structure, and relevant genetic or environmental context. Such analysis can support risk assessment, but the observed relationship reflects variation in susceptibility rather than a uniform outcome for every individual.
Variant analysis can contribute to distinguishing or organizing clinical conditions by identifying genetic differences associated with disease-related traits. In this setting, the value lies in connecting a polymorphism with relevant biological effects and clinical patterns. The resulting information can support diagnostic classification while also contributing to broader research on how genetic diversity relates to disease.
Pharmacogenomics examines how genetic variation relates to differences in treatment response or adverse effects. Researchers can use polymorphism data to investigate why individuals may respond differently to the same therapy and to support more individualized approaches to care. The clinical relevance depends on the variant, its biological effect, and the surrounding genetic or environmental context.