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Genetic Variation

Genetic Variation

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.
Genes exist in different versions called alleles, which...

Heritability

Heritability

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" a trait is,...

Human Genetics

Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...

Polygenic Traits

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

Polygenic Traits

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

Inheritance

Inheritance

Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...

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Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

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Human genetic variation and its contribution to complex traits.

Kelly A Frazer¹, Sarah S Murray, Nicholas J Schork

¹Scripps Genomic Medicine, Scripps Translational Science Institute and The Scripps Research Institute, La Jolla, California 92037, USA. kfrazer@scripps.edu

Nature Reviews. Genetics

|March 19, 2009

Summary

Researchers are cataloguing human genetic variation to understand complex traits and diseases. While common variants offer insights, linking them to specific traits and identifying rare variants remain challenges for future genetic studies.

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Area of Science:

Genetics and Genomics
Human Phenotype Research

Background:

Extensive efforts have been made to catalogue human genetic variation.
Genome-wide studies have assessed common single nucleotide polymorphisms (SNPs) for associations with complex traits and diseases.

Purpose of the Study:

To explore the correlation between human genetic variation and phenotypic differences.
To identify the heritable components of complex traits and elucidate functional links between variants and phenotypes.

Main Methods:

Genome-wide association studies (GWAS) for common single nucleotide polymorphisms (SNPs).
Analysis of genetic variation in relation to complex traits and common diseases.

Main Results:

Genome-wide studies have provided new biological insights into complex traits.
A limited proportion of the heritable component for complex traits has been identified through common variants.

Conclusions:

Elucidating the functional link between associated genetic variants and phenotypic traits remains a significant challenge.
Technological advancements in detecting rare and structural variants are crucial for future progress in understanding genotype-phenotype relationships.