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Related Concept Videos

Incomplete Dominance01:43

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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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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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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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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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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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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Related Experiment Video

Updated: Jun 10, 2025

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay EMSA and DNA-affinity Precipitation Assay DAPA
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PAGER: A novel genotype encoding strategy for modeling deviations from additivity in complex trait association

Philip J Freda1, Attri Ghosh1, Priyanka Bhandary1

  • 1Department of Computational Biomedicine, Cedars-Sinai Medical Center, 700 N. San Vincente Blvd., Pacific Design Center, Suite G540, West Hollywood, CA, 90069, USA.

Biodata Mining
|October 11, 2024
PubMed
Summary

A new method called Phenotype Adjusted Genotype Encoding and Ranking (PAGER) improves genetic association studies by accurately encoding genetic variants. PAGER enhances statistical power and computational speed, uncovering novel insights into complex traits.

Keywords:
Association studiesCase-controlDominanceGWASGeneticsGenotype encodingHeterosisInheritanceQTL analysisQuantitative traits

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

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Area of Science:

  • Genetics
  • Bioinformatics
  • Statistical Genetics

Background:

  • The additive model of inheritance is standard in genetic association studies but often inaccurate, leading to errors.
  • Deviations from additivity contribute to phenotypic variance but are challenging to model computationally.
  • Existing alternative genotype encoding methods can be computationally expensive or methodologically complex.

Purpose of the Study:

  • To introduce Phenotype Adjusted Genotype Encoding and Ranking (PAGER), an efficient pre-processing method for genotype encoding.
  • To develop a method that accurately reflects a variant's true inheritance model, improving precision and reducing computational costs.
  • To address limitations of the additive model in genetic association studies.

Main Methods:

  • PAGER encodes genetic variants based on normalized mean phenotypic differences between genotype classes (AA, Aa, aa).
  • The method was benchmarked using simulated single nucleotide polymorphisms (SNPs) with binary and continuous phenotypes.
  • PAGER was applied to real-world genetic data to identify quantitative trait loci (QTL).

Main Results:

  • PAGER accurately represents diverse inheritance patterns (additive, dominant, recessive, heterosis).
  • It achieves statistical power comparable to or exceeding other methods and is up to 55 times faster than EDGE.
  • A novel QTL associated with body mass index in rats was identified using PAGER, which was missed by the additive model.

Conclusions:

  • PAGER is an efficient genotype encoding approach for genetic association studies.
  • It can uncover sources of missing heritability and provide novel insights into complex traits.
  • The method offers significant advantages with minimal computational or methodological costs.