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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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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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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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Updated: Jun 11, 2025

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay EMSA and DNA-affinity Precipitation Assay DAPA
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Population-specific putative causal variants shape quantitative traits.

Satoshi Koyama1,2,3, Xiaoxi Liu4, Yoshinao Koike4,5,6

  • 1Laboratory for Cardiovascular Genomics and Informatics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan.

Nature Genetics
|October 3, 2024
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Summary
This summary is machine-generated.

This study identified 4,423 genetic loci linked to 63 traits in Japanese individuals, discovering 601 new associations and 9,406 potential causal variants, including novel mechanisms for noncoding variants.

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Area of Science:

  • Human genetics
  • Genomic association studies
  • Quantitative trait loci

Background:

  • Human genetic variants influence traits through complex, often unknown, mechanisms.
  • Large-scale genetic studies are crucial for understanding trait associations.
  • Population-specific genetic architecture requires dedicated investigation.

Purpose of the Study:

  • To identify significant genetic loci and putatively causal variants associated with quantitative traits in a Japanese population.
  • To discover novel genetic associations and explore mechanisms of noncoding variants.
  • To provide a resource of fine-mapped causal variants for functional validation.

Main Methods:

  • Combined data from approximately 260,000 Japanese participants.
  • Utilized a Japanese-specific genotype reference panel.
  • Employed statistical fine-mapping techniques to identify causal variants.

Main Results:

  • Identified 4,423 significant loci across 63 quantitative traits, including 601 novel associations.
  • Discovered 9,406 putatively causal variants, encompassing coding, splicing, and noncoding types.
  • Found Japanese-specific variants, such as rs730881101 in TNNT2 (heart function) and rs13306436 in IL6 (inflammation, tuberculosis resistance).
  • Demonstrated that noncoding variants, including those in 3' UTRs, can have significant effects and novel mechanisms, like rs13306436 conferring resistance to mRNA degradation.

Conclusions:

  • This study provides a comprehensive map of genetic associations in a large Japanese cohort.
  • It highlights the importance of population-specific genetic studies and fine-mapping for variant discovery.
  • The findings offer a valuable list of candidate causal variants for functional studies and reveal new mechanisms for genetic trait determination.