Natural and Unanticipated Modifiers of RNAi Activity in Caenorhabditis elegans

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Issue Date
2012-11-28Author
Asad, Nadeem
Yih Aw, Wen
Timmons, Lisa
Publisher
Public Library of Science
Type
Article
Article Version
Scholarly/refereed, publisher version
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Show full item recordAbstract
Organisms used as model genomics systems are maintained as isogenic strains, yet evidence of sequence differences between independently maintained wild-type stocks has been substantiated by whole-genome resequencing data and strain-specific phenotypes. Sequence differences may arise from replication errors, transposon mobilization, meiotic gene conversion, or environmental or chemical assault on the genome. Low frequency alleles or mutations with modest effects on phenotypes can contribute to natural variation, and it has proven possible for such sequences to become fixed by adapted evolutionary enrichment and identified by resequencing. Our objective was to identify and analyze single locus genetic defects leading to RNAi resistance in isogenic strains of Caenorhabditis elegans. In so doing, we uncovered a mutation that arose de novo in an existing strain, which initially frustrated our phenotypic analysis. We also report experimental, environmental, and genetic conditions that can complicate phenotypic analysis of RNAi pathway defects. These observations highlight the potential for unanticipated mutations, coupled with genetic and environmental phenomena, to enhance or suppress the effects of known mutations and cause variation between wild-type strains.
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Citation
Asad, N., Aw, W. Y., & Timmons, L. (2012). Natural and Unanticipated Modifiers of RNAi Activity in Caenorhabditis elegans. PLoS ONE, 7(11). http://dx.doi.org/10.1371/journal.pone.0050191
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