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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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.
GWAS does not require the identification of the target gene involved in...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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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Methodological Issues in Multistage Genome-wide Association Studies.

Duncan C Thomas1, Graham Casey, David V Conti

  • 1Department of Preventive Medicine, University of Southern California.

Statistical Science : a Review Journal of the Institute of Mathematical Statistics
|July 8, 2010
PubMed
Summary
This summary is machine-generated.

The two-stage genome-wide association study (GWAS) design offers cost savings but is increasingly replaced by single-stage designs due to falling costs. True replication requires independent studies, not just a second stage of a two-stage GWAS.

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Area of Science:

  • Genetics
  • Statistical Genetics
  • Genomic Association Studies

Background:

  • High costs of commercial genotyping chips historically favored two-stage genome-wide association studies (GWAS).
  • Two-stage designs involve initial discovery in a subset, followed by joint analysis of promising SNPs.
  • This approach aimed for cost savings while maintaining statistical power and controlling type I error.

Purpose of the Study:

  • To evaluate the evolving landscape of GWAS designs in light of declining genotyping costs.
  • To clarify the distinction between two-stage designs and true replication studies.
  • To outline subsequent steps after initial GWAS discovery, including replication and functional studies.

Main Methods:

  • The abstract discusses theoretical cost-benefit analyses of two-stage versus single-stage GWAS.
  • It contrasts the efficiency of two-stage designs with the implications of falling commercial panel costs.
  • It differentiates the purpose of the second stage in a two-stage design from independent replication.

Main Results:

  • Declining costs of commercial genotyping panels are making single-stage GWAS more attractive.
  • The traditional two-stage design is being abandoned by many researchers in favor of full genotyping.
  • The abstract emphasizes that the second stage of a two-stage design is not a true replication.

Conclusions:

  • True replication of GWAS findings requires independent studies in similar populations.
  • Subsequent research should focus on generalizability, fine-mapping, and functional studies.
  • Multistage sampling may be valuable for deep re-sequencing after initial GWAS discovery.