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Behavioral Genetics and Its Designs01:23

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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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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...
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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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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Systems genetics approaches to understand complex traits.

Mete Civelek1, Aldons J Lusis1

  • 11] Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles. [2] Department of Human Genetics, University of California, Los Angeles. [3] Department of Medicine, A2-237 Center for Health Sciences, University of California, Los Angeles, California 90095-1679, USA.

Nature Reviews. Genetics
|December 4, 2013
PubMed
Summary
This summary is machine-generated.

Systems genetics integrates molecular data to map complex traits and identify disease-related genes. This approach offers a global view of biological networks underlying common human diseases.

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Area of Science:

  • Genetics and Systems Biology

Background:

  • Complex traits are influenced by numerous genetic and environmental factors.
  • Understanding the molecular basis of complex traits and diseases remains a significant challenge in biology.

Purpose of the Study:

  • To introduce and highlight the importance of systems genetics as a powerful approach.
  • To explain how systems genetics can elucidate the genetic architecture of complex traits and diseases.

Main Methods:

  • Utilizes a combination of experimental and statistical techniques.
  • Quantifies and integrates intermediate phenotypes (e.g., transcript, protein, metabolite levels).
  • Analyzes populations with variations in traits of interest.

Main Results:

  • Provides a global perspective on the molecular architecture of complex traits.
  • Facilitates the identification of genes, pathways, and networks implicated in disease.

Conclusions:

  • Systems genetics is crucial for understanding the contribution of loci identified in genome-wide association studies to disease susceptibility.
  • This approach is increasingly vital for advancing our comprehension of both fundamental biology and human disease mechanisms.