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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.
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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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Agouti: A Lethal Allele
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Related Experiment Video

Updated: Jul 5, 2025

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

Patrick B Chen, Rachel Chen, Nathan LaPierre

    Biorxiv : the Preprint Server for Biology
    |January 23, 2024
    PubMed
    Summary

    Researchers identified six genes influencing fear behavior by linking quantitative trait loci (QTLs) to specific genes. This work advances understanding of genetic influences on behavior, particularly in excitatory neurons.

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    Area of Science:

    • Neurogenetics
    • Behavioral Genetics
    • Molecular Biology

    Background:

    • Understanding the genetic basis of behavior requires linking quantitative trait loci (QTLs) to specific genes and their functions.
    • Few studies have successfully elucidated the pathway from genetic loci to behavioral changes.

    Approach:

    • Developed a novel test to determine if a gene mediates the effect of a QTL.
    • Mapped three fear-related traits, tested fourteen candidate genes at six QTLs, and identified six genes involved in fear behavior.
    • Utilized single nucleus transcriptomic and epigenetic analyses to pinpoint the cell types mediating genetic effects.

    Key Points:

    • Identified six genes influencing fear behavior, including four with known roles in synapse function (Lsamp, Ptprd, Nptx2, Sh3gl), one transcriptional co-activator (Psip1), and one long non-coding RNA (4933413L06Rik).
    • Excitatory neurons were implicated as the primary mediators of genetic effects on fear behavior.
    • Found that transcriptomic and epigenetic variations preferentially occur in excitatory neurons, suggesting greater permissiveness for genetic variation in these circuits.

    Conclusions:

    • This study provides a critical step in connecting genetic mapping of QTLs to novel biological mechanisms underlying behavior.
    • Results challenge traditional views on the relationship between genetic and functional variation in neuronal circuits.
    • Opens new avenues for investigating the genetic architecture of complex behaviors.