1. Recurrent horizontal transfer identifies mitochondrial positive selection in a transmissible cancer.
- Author
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Strakova A, Nicholls TJ, Baez-Ortega A, Ní Leathlobhair M, Sampson AT, Hughes K, Bolton IAG, Gori K, Wang J, Airikkala-Otter I, Allen JL, Allum KM, Arnold CL, Bansse-Issa L, Bhutia TN, Bisson JL, Blank K, Briceño C, Castillo Domracheva A, Corrigan AM, Cran HR, Crawford JT, Cutter SM, Davis E, de Castro KF, De Nardi AB, de Vos AP, Delgadillo Keenan L, Donelan EM, Espinoza Huerta AR, Faramade IA, Fazil M, Fotopoulou E, Fruean SN, Gallardo-Arrieta F, Glebova O, Gouletsou PG, Häfelin Manrique RF, Henriques JJGP, Horta RS, Ignatenko N, Kane Y, King C, Koenig D, Krupa A, Kruzeniski SJ, Lanza-Perea M, Lazyan M, Lopez Quintana AM, Losfelt T, Marino G, Martínez Castañeda S, Martínez-López MF, Masuruli BM, Meyer M, Migneco EJ, Nakanwagi B, Neal KB, Neunzig W, Nixon SJ, Ortega-Pacheco A, Pedraza-Ordoñez F, Peleteiro MC, Polak K, Pye RJ, Ramirez-Ante JC, Reece JF, Rojas Gutierrez J, Sadia H, Schmeling SK, Shamanova O, Sherlock AG, Steenland-Smit AE, Svitich A, Tapia Martínez LJ, Thoya Ngoka I, Torres CG, Tudor EM, van der Wel MG, Vițălaru BA, Vural SA, Walkinton O, Wehrle-Martinez AS, Widdowson SAE, Zvarich I, Chinnery PF, Falkenberg M, Gustafsson CM, and Murchison EP
- Subjects
- Animals, Dogs, Gene Transfer, Horizontal, Phylogeny, Polymorphism, Genetic, Recurrence, Selection, Genetic, DNA, Mitochondrial genetics, Dog Diseases genetics, Haplotypes, Venereal Tumors, Veterinary genetics
- Abstract
Autonomous replication and segregation of mitochondrial DNA (mtDNA) creates the potential for evolutionary conflict driven by emergence of haplotypes under positive selection for 'selfish' traits, such as replicative advantage. However, few cases of this phenomenon arising within natural populations have been described. Here, we survey the frequency of mtDNA horizontal transfer within the canine transmissible venereal tumour (CTVT), a contagious cancer clone that occasionally acquires mtDNA from its hosts. Remarkably, one canine mtDNA haplotype, A1d1a, has repeatedly and recently colonised CTVT cells, recurrently replacing incumbent CTVT haplotypes. An A1d1a control region polymorphism predicted to influence transcription is fixed in the products of an A1d1a recombination event and occurs somatically on other CTVT mtDNA backgrounds. We present a model whereby 'selfish' positive selection acting on a regulatory variant drives repeated fixation of A1d1a within CTVT cells.
- Published
- 2020
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