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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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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,...
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Related Experiment Video

Updated: Jun 13, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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Genetic Variance in Heparan Sulfation Is Associated With Salt Sensitivity.

Jetta J Oppelaar1,2, Bart Ferwerda3, Mohamed A Romman1

  • 1Department of Internal Medicine, Section of Nephrology (J.J.O., M.A.R., G.N.S., R.H.G.O.E., L.V.).

Hypertension (Dallas, Tex. : 1979)
|September 9, 2024
PubMed
Summary
This summary is machine-generated.

Genetic variations in glycosaminoglycan genes influence salt sensitivity and blood pressure regulation. Specific gene variants like rs2892799 in NDST3 are linked to higher blood pressure under high sodium intake, highlighting a genetic component in hypertension.

Keywords:
UK Biobankblood pressureglycosaminoglycanssalt tolerancesodium

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Area of Science:

  • Genetics
  • Cardiovascular Research
  • Metabolomics

Background:

  • Salt sensitivity, a major determinant of blood pressure (BP), has high heritability, suggesting a significant genetic influence.
  • The specific role of glycosaminoglycan (GAG) genes, vital for salinity tolerance, in BP regulation remains largely unexplored.

Purpose of the Study:

  • To investigate interactions between genetic variants in GAG genes and sodium excretion in relation to BP.
  • To explore the association between GAG gene variants, sodium intake, and BP in large, multiethnic cohorts.

Main Methods:

  • Genome-wide association study (GWAS) of 54,126 variants in 130 GAG genes in 20,420 EPIC-Norfolk participants.
  • Validation in UK Biobank (n=414,132) and HELIUS (n=2,239) studies.
  • Analysis of urinary GAG composition and intervention studies with dietary sodium loading.

Main Results:

  • rs2892799 in NDST3 and rs9654628 in HS3ST5 showed significant interactions with sodium on BP.
  • The C allele of rs2892799 was associated with higher mean arterial pressure under high sodium conditions.
  • Genotype-specific urinary N-sulfated heparan sulfate (D0S0) expression correlated with sodium-mediated BP changes.

Conclusions:

  • Genetic variation in GAG genes, particularly NDST3, plays a role in regulating BP response to sodium.
  • Urinary GAG profiles, like D0S0 expression, may serve as biomarkers for salt sensitivity.
  • These findings highlight the importance of GAG genetics in understanding human BP regulation and salt sensitivity.