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Shared Genomic Regions Underlie Natural Variation in Diverse Toxin Responses

Journal Article · · Genetics
 [1];  [1];  [2];  [3];  [1];  [3];  [3];  [4];  [5]
  1. Northwestern Univ., Evanston, IL (United States). Molecular Biosciences; Northwestern Univ., Evanston, IL (United States). Interdisciplinary Biological Sciences Program
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Human Genetics
  3. Northwestern Univ., Evanston, IL (United States). Molecular Biosciences
  4. Northwestern Univ., Evanston, IL (United States). Robert H. Lurie Comprehensive Cancer Center
  5. Northwestern Univ., Evanston, IL (United States). Molecular Biosciences; Northwestern Univ., Evanston, IL (United States). Robert H. Lurie Comprehensive Cancer Center
Phenotypic complexity is caused by the contributions of environmental factors and multiple genetic loci, interacting or acting independently. Studies of yeast and Arabidopsis often find that the majority of natural variation across phenotypes is attributable to independent additive quantitative trait loci (QTL). Detected loci in these organisms explain most of the estimated heritable variation. By contrast, many heritable components underlying phenotypic variation in metazoan models remain undetected. Before the relative impacts of additive and interactive variance components on metazoan phenotypic variation can be dissected, high replication and precise phenotypic measurements are required to obtain sufficient statistical power to detect loci contributing to this missing heritability. Here, we used a panel of 296 recombinant inbred advanced intercross lines of Caenorhabditis elegans and a high-throughput fitness assay to detect loci underlying responses to 16 different toxins, including heavy metals, chemotherapeutic drugs, pesticides, and neuropharmaceuticals. Using linkage mapping, we identified 82 QTL that underlie variation in responses to these toxins, and predicted the relative contributions of additive loci and genetic interactions across various growth parameters. Additionally, we identified three genomic regions that impact responses to multiple classes of toxins. These QTL hotspots could represent common factors impacting toxin responses. We went further to generate near-isogenic lines and chromosome substitution strains, and then experimentally validated these QTL hotspots, implicating additive and interactive loci that underlie toxin-response variation.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1571945
Journal Information:
Genetics, Journal Name: Genetics Journal Issue: 4 Vol. 210; ISSN 0016-6731
Publisher:
Genetics Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

A multi-parent recombinant inbred line population of C. elegans allows identification of novel QTLs for complex life history traits journal March 2019
A spontaneous complex structural variant in rcan-1 increases exploratory behavior and laboratory fitness of Caenorhabditis elegans journal February 2020
A Novel Gene Underlies Bleomycin-Response Variation in Caenorhabditis elegans journal June 2019
Tightly linked antagonistic‐effect loci underlie polygenic phenotypic variation in C. elegans journal September 2019
WormQTL2: an interactive platform for systems genetics in Caenorhabditis elegans journal January 2020
Dissection of Complex, Fitness-Related Traits in Multiple Drosophila Mapping Populations Offers Insight into the Genetic Control of Stress Resistance journal February 2019


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