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Friend turned foe :
Friend turned foe : selfish behavior of a spontaneously arising mitochondrial deletion in an experimentally evolved Caenorhabditis elegans population
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- Sequeira, Abigail N. (author)
- Department of Veterinary Integrative Biosciences, Texas A&M University , 402 Raymond Stotzer Parkway, College Station, TX 77845 , USA;Department of Biology, Pennsylvania State University , 208 Mueller Laboratory, University Park, PA 16802 , USA
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- O'Keefe, Ian P. (author)
- Department of Veterinary Integrative Biosciences, Texas A&M University , 402 Raymond Stotzer Parkway, College Station, TX 77845 , USA;Department of Biochemistry and Molecular Biology, University of Maryland , 655 W. Baltimore Street, Baltimore, MD 21201 , USA
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- Katju, Vaishali, Professor, 1970- (author)
- Uppsala universitet,Evolutionsbiologi,Department of Veterinary Integrative Biosciences, Texas A&M University, 402 Raymond Stotzer Parkway, College Station, TX 77845, USA
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- Bergthorsson, Ulfar (author)
- Uppsala universitet,Evolutionsbiologi,Department of Veterinary Integrative Biosciences, Texas A&M University, 402 Raymond Stotzer Parkway, College Station, TX 77845, USA
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Department of Veterinary Integrative Biosciences, Texas A&M University , 402 Raymond Stotzer Parkway, College Station, TX 77845 , USA;Department of Biology, Pennsylvania State University , 208 Mueller Laboratory, University Park, PA 16802 , USA Department of Veterinary Integrative Biosciences, Texas A&M University , 402 Raymond Stotzer Parkway, College Station, TX 77845 , USA;Department of Biochemistry and Molecular Biology, University of Maryland , 655 W Baltimore Street, Baltimore, MD 21201 , USA (creator_code:org_t)
- 2024
- 2024
- English.
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In: G3. - : Oxford University Press. - 2160-1836.
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Abstract
Subject headings
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- Selfish mitochondrial DNA (mtDNA) mutations are variants that can proliferate within cells and enjoy a replication or transmission bias without fitness benefits for the host. mtDNA deletions in Caenorhabditis elegans can reach high heteroplasmic frequencies despite significantly reducing fitness, illustrating how new mtDNA variants can give rise to genetic conflict between different levels of selection and between the nuclear and mitochondrial genomes. During a mutation accumulation experiment in C. elegans, a 1,034-bp deletion originated spontaneously and reached an 81.7% frequency within an experimental evolution line. This heteroplasmic mtDNA deletion, designated as meuDf1, eliminated portions of 2 protein-coding genes (coxIII and nd4) and tRNA-thr in entirety. mtDNA copy number in meuDf1 heteroplasmic individuals was 35% higher than in individuals with wild-type mitochondria. After backcrossing into a common genetic background, the meuDf1 mitotype was associated with reduction in several fitness traits and independent competition experiments found a 40% reduction in composite fitness. Experiments that relaxed individual selection by single individual bottlenecks demonstrated that the deletion-bearing mtDNA possessed a strong transmission bias, thereby qualifying it as a novel selfish mitotype.
Subject headings
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Genetik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Genetics (hsv//eng)
Keyword
- selfish mitochondria
- Caenorhabditis elegans
- mutation
- heteroplasmy
- fitness
- genetic conflict
- mtDNA
- Biologi med inriktning mot molekylär evolution
- Biology with specialization in Molecular Evolution
- Biology with specialization in Evolutionary Genetics
- Biologi med inriktning mot evolutionär genetik
Publication and Content Type
- ref (subject category)
- art (subject category)
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