A lethal mitonuclear incompatibility in complex I of natural hybrids. 2024

Benjamin M Moran, and Cheyenne Y Payne, and Daniel L Powell, and Erik N K Iverson, and Alexandra E Donny, and Shreya M Banerjee, and Quinn K Langdon, and Theresa R Gunn, and Rebecca A Rodriguez-Soto, and Angel Madero, and John J Baczenas, and Korbin M Kleczko, and Fang Liu, and Rowan Matney, and Kratika Singhal, and Ryan D Leib, and Osvaldo Hernandez-Perez, and Russell Corbett-Detig, and Judith Frydman, and Casey Gifford, and Manfred Schartl, and Justin C Havird, and Molly Schumer
Department of Biology, Stanford University, Stanford, CA, USA. benmoran@stanford.edu.

The evolution of reproductive barriers is the first step in the formation of new species and can help us understand the diversification of life on Earth. These reproductive barriers often take the form of hybrid incompatibilities, in which alleles derived from two different species no longer interact properly in hybrids1-3. Theory predicts that hybrid incompatibilities may be more likely to arise at rapidly evolving genes4-6 and that incompatibilities involving multiple genes should be common7,8, but there has been sparse empirical data to evaluate these predictions. Here we describe a mitonuclear incompatibility involving three genes whose protein products are in physical contact within respiratory complex I of naturally hybridizing swordtail fish species. Individuals homozygous for mismatched protein combinations do not complete embryonic development or die as juveniles, whereas those heterozygous for the incompatibility have reduced complex I function and unbalanced representation of parental alleles in the mitochondrial proteome. We find that the effects of different genetic interactions on survival are non-additive, highlighting subtle complexity in the genetic architecture of hybrid incompatibilities. Finally, we document the evolutionary history of the genes involved, showing signals of accelerated evolution and evidence that an incompatibility has been transferred between species via hybridization.

UI MeSH Term Description Entries
D005399 Fishes A group of cold-blooded, aquatic vertebrates having gills, fins, a cartilaginous or bony endoskeleton, and elongated bodies covered with scales.
D006720 Homozygote An individual in which both alleles at a given locus are identical. Homozygotes
D006824 Hybridization, Genetic The genetic process of crossbreeding between genetically dissimilar parents to produce a hybrid. Crossbreeding,Hybridization, Intraspecies,Crossbreedings,Genetic Hybridization,Genetic Hybridizations,Hybridizations, Genetic,Hybridizations, Intraspecies,Intraspecies Hybridization,Intraspecies Hybridizations
D000483 Alleles Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product. Allelomorphs,Allele,Allelomorph
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D042967 Electron Transport Complex I A flavoprotein and iron sulfur-containing oxidoreductase complex that catalyzes the conversion of UBIQUINONE to ubiquinol. In MITOCHONDRIA the complex also couples its reaction to the transport of PROTONS across the internal mitochondrial membrane. The NADH DEHYDROGENASE component of the complex can be isolated and is listed as EC 1.6.99.3. NADH Dehydrogenase (Ubiquinone),Complex I Dehydrogenase,NADH DH I,NADH Dehydrogenase Complex 1,NADH Dehydrogenase I,NADH Q1 Oxidoreductase,NADH-CoQ Reductase,NADH-Coenzyme Q Reductase,NADH-Ubiquinone Oxidoreductase,NADH-Ubiquinone Reductase,Respiratory Complex I,Rotenone-Sensitive Mitochondrial NADH-Ubiquinone Oxidoreductase,Ubiquinone Reductase,Dehydrogenase, Complex I,NADH CoQ Reductase,NADH Coenzyme Q Reductase,NADH Ubiquinone Oxidoreductase,NADH Ubiquinone Reductase,Oxidoreductase, NADH Q1,Oxidoreductase, NADH-Ubiquinone,Reductase, NADH-Ubiquinone,Rotenone Sensitive Mitochondrial NADH Ubiquinone Oxidoreductase

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