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Related Concept Videos

Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Human Genetics01:28

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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.
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Epistasis Analysis01:09

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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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Epistasis01:39

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Related Experiment Video

Updated: Jun 27, 2025

Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice
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Complementation testing identifies genes mediating effects at quantitative trait loci underlying fear-related

Patrick B Chen1, Rachel Chen1, Nathan LaPierre2

  • 1Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA.

Cell Genomics
|May 2, 2024
PubMed
Summary

Researchers identified six genes influencing fear behavior by mapping quantitative trait loci (QTLs). This study links genetic variations to specific behaviors, advancing our understanding of the genetic basis of behavior.

Keywords:
QTL mappingfear conditioninginbred mouse strainsquantitative complementationsingle-nucleus ATAC-seqsingle-nucleus RNA-seq

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Area of Science:

  • Neurogenetics
  • Behavioral Genetics
  • Molecular Biology

Background:

  • Understanding the genetic underpinnings of complex traits, particularly behavior, remains a significant challenge.
  • Few studies have successfully traced the pathway from genetic loci to specific behavioral changes.

Purpose of the Study:

  • To investigate the role of specific genes in fear behavior.
  • To identify genes associated with quantitative trait loci (QTLs) influencing fear.

Main Methods:

  • Mapped three fear-related behavioral traits.
  • Tested fourteen candidate genes at six QTLs using quantitative complementation.
  • Analyzed transcriptome and epigenetic variations, particularly in neuronal circuits.

Main Results:

  • Identified six genes associated with fear behavior, including four with known synapse function roles, one novel behavioral gene (Psip1), and a long non-coding RNA (4933413L06Rik).
  • Observed preferential variation in transcriptome and epigenetic modalities within excitatory neurons.
  • Indicated greater permissibility of genetic variation in excitatory versus inhibitory neuronal circuits.

Conclusions:

  • This research provides a crucial link between genetic mapping of QTLs and the underlying biology of behavior.
  • The findings challenge traditional views on the relationship between genetic and functional variation in neuronal circuits.
  • Opens new avenues for understanding the genetic architecture of complex behaviors.