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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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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.
GWAS does not require the identification of the target gene involved in...
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Related Experiment Video

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Large-Scale Multi-Omics Genome-Wide Association Studies Mo-GWAS: Guidelines for Sample Preparation and Normalization
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Genome-Wide Association Studies.

Abbas Dehghan1

  • 1Department of Epidemiology and Biostatistics, Imperial College London, London, UK. a.dehghan@imperial.ac.uk.

Methods in Molecular Biology (Clifton, N.J.)
|June 8, 2018
PubMed
Summary

Genome-wide association studies (GWAS) have advanced our understanding of complex genetic disorders. This review covers GWAS concepts, the "common disease, common variant" theory, and technical aspects for genetic research.

Keywords:
Genetic associationGenome-wide association studiesGenotype imputationLinkage disequilibrium

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Area of Science:

  • Genetics
  • Genomics
  • Bioinformatics

Background:

  • Genetic association studies, particularly genome-wide association studies (GWAS), have significantly enhanced the understanding of complex genetic disorders over the past decade.
  • The
  • common disease, common variant
  • theory is a foundational concept in this field.

Purpose of the Study:

  • To review the fundamental concepts underpinning the genome-wide association studies (GWAS) approach.
  • To explain the technological advancements enabling the capture of common genetic variance for GWAS.
  • To discuss the technical and analytical aspects critical for successful GWAS implementation.

Main Methods:

  • Review of key concepts in genetic association studies.
  • Explanation of the
  • common disease, common variant
  • theory.
  • Discussion of technical aspects including genotype imputation, epidemiologic designs, and analysis methods.

Main Results:

  • Genome-wide association studies (GWAS) have become a powerful tool for dissecting the genetic architecture of complex diseases.
  • The ability to capture common genetic variance has been crucial for the success of GWAS.
  • Key technical considerations such as genomic inflation, multiple testing, and replication are essential for robust findings.

Conclusions:

  • Genome-wide association studies (GWAS) provide a robust framework for investigating the genetic basis of complex disorders.
  • Understanding the underlying theory and technical methodologies of GWAS is crucial for advancing genetic research.
  • Careful consideration of analytical aspects ensures the reliability and validity of GWAS results in complex disease genetics.