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Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Updated: Jun 28, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Common genetic variation and human disease.

Nick Orr¹, Stephen Chanock²

¹Laboratory of Translation Genomics, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.

Advances in Genetics

|November 18, 2008

Summary

This summary is machine-generated.

Advances in genotyping platforms enable large-scale genome-wide association studies for complex diseases. These studies have identified over 150 new susceptibility loci, revealing novel genetic links to various conditions.

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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

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Area of Science:

Human genetics
Complex disease genetics
Genetic epidemiology

Background:

Human genetics research has evolved from studying rare disorders to large-scale investigations of common complex diseases.
Technological advancements, particularly in genotyping, have enabled genome-wide association studies (GWAS).
GWAS involve analyzing thousands of samples to identify genetic variations associated with diseases.

Purpose of the Study:

To provide an overview of complex disease genetics using mapping by association.
To discuss the advancements and discoveries in the field.
To highlight the challenges and limitations encountered in association studies.

Main Methods:

Genome-wide association studies (GWAS).
Analysis of large consortia-based genetic data.
Discovery of novel susceptibility loci through genotyping platforms.

Main Results:

Identification of over 150 novel susceptibility loci for a wide range of diseases.
Discovery of genetic associations in both biologically plausible genes and previously unconsidered candidates.
Demonstration of the power of large-scale collaborative efforts in human genetics.

Conclusions:

Genome-wide association studies are a powerful tool for dissecting the genetic architecture of complex diseases.
The field has made significant progress in identifying genetic risk factors.
Careful consideration of potential pitfalls and caveats is essential for robust genetic association studies.