Browsing by Subject "POSITIVE SELECTION"

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  • Coronado-Zamora, Marta; Salvador-Martinez, Irepan; Castellano, David; Barbadilla, Antonio; Salazar-Ciudad, Isaac (2019)
    Previous studies of the evolution of genes expressed at different life-cycle stages of Drosophila melanogaster have not been able to disentangle adaptive from nonadaptive substitutions when using nonsynonymous sites. Here, we overcome this limitation by combining whole-genome polymorphism data from D. melanogaster and divergence data between D. melanogaster and Drosophila yakuba. For the set of genes expressed at different life-cycle stages of D. melanogaster, as reported in modENCODE, we estimate the ratio of substitutions relative to polymorphism between nonsynonymous and synonymous sites (alpha) and then alpha is discomposed into the ratio of adaptive (omega(a)) and nonadaptive (omega(na)) substitutions to synonymous substitutions. We find that the genes expressed in mid- and late-embryonic development are the most conserved, whereas those expressed in early development and postembryonic stages are the least conserved. Importantly, we found that low conservation in early development is due to high rates of nonadaptive substitutions (high omega(na)), whereas in postembryonic stages it is due, instead, to high rates of adaptive substitutions (high omega(a)). By using estimates of different genomic features (codon bias, average intron length, exon number, recombination rate, among others), we also find that genes expressed in mid- and late-embryonic development show the most complex architecture: they are larger, have more exons, more transcripts, and longer introns. In addition, these genes are broadly expressed among all stages. We suggest that all these genomic features are related to the conservation of mid- and late-embryonic development. Globally, our study supports the hourglass pattern of conservation and adaptation over the life-cycle.
  • Zamora, Juan Carlos; Svensson, Mans; Kirschner, Roland; Olariaga, Ibai; Ryman, Svengunnar; Alberto Parra, Luis; Geml, Jozsef; Rosling, Anna; Adamcik, Slavomir; Ahti, Teuvo; Aime, M. Catherine; Ainsworth, A. Martyn; Albert, Laszlo; Alberto, Edgardo; Garcia, Alberto Altes; Ageev, Dmitry; Agerer, Reinhard; Aguirre-Hudson, Begona; Ammirati, Joe; Andersson, Harry; Angelini, Claudio; Antonin, Vladimir; Aoki, Takayuki; Aptroot, Andre; Argaud, Didier; Sosa, Blanca Imelda Arguello; Aronsen, Arne; Arup, Ulf; Asgari, Bita; Assyov, Boris; Atienza, Violeta; Bandini, Ditte; Baptista-Ferreira, Joao Luis; Baral, Hans-Otto; Baroni, Tim; Barreto, Robert Weingart; Baker, Henry; Bell, Ann; Bellanger, Jean-Michel; Bellu, Francesco; Bemmann, Martin; Bendiksby, Mika; Bendiksen, Egil; Bendiksen, Katriina; Benedek, Lajos; Beresova-Guttova, Anna; Berger, Franz; Berndt, Reinhard; Bernicchia, Annarosa; Biketova, Alona Yu; Bizio, Enrico; Bjork, Curtis; Boekhout, Teun; Boertmann, David; Bohning, Tanja; Boittin, Florent; Boluda, Carlos G.; Boomsluiter, Menno W.; Borovicka, Jan; Brandrud, Tor Erik; Braun, Uwe; Brodo, Irwin; Bulyonkova, Tatiana; Burdsall, Harold H.; Buyck, Bart; Burgaz, Ana Rosa; Calatayud, Vicent; Callac, Philippe; Campo, Emanuele; Candusso, Massimo; Capoen, Brigitte; Carbo, Joaquim; Carbone, Matteo; Castaneda-Ruiz, Rafael F.; Castellano, Michael A.; Chen, Jie; Clerc, Philippe; Consiglio, Giovanni; Corriol, Gilles; Courtecuisse, Regis; Crespo, Ana; Cripps, Cathy; Crous, Pedro W.; da Silva, Gladstone Alves; da Silva, Meiriele; Dam, Marjo; Dam, Nico; Dammrich, Frank; Das, Kanad; Davies, Linda; De Crop, Eske; De Kesel, Andre; De Lange, Ruben; Bonzi, Barbara De Madrignac; dela Cruz, Thomas Edison E.; Delgat, Lynn; Demoulin, Vincent; Desjardin, Dennis E.; Diederich, Paul; Dima, Balint; Dios, Maria Martha; Divakar, Pradeep Kumar; Douanla-Meli, Clovis; Douglas, Brian; Drechsler-Santos, Elisandro Ricardo; Dyer, Paul S.; Eberhardt, Ursula; Ertz, Damien; Esteve-Raventos, Fernando; Salazar, Javier Angel Etayo; Evenson, Vera; Eyssartier, Guillaume; Farkas, Edit; Favre, Alain; Fedosova, Anna G.; Filippa, Mario; Finy, Peter; Flakus, Adam; Fos, Simon; Fournier, Jacques; Fraiture, Andre; Franchi, Paolo; Molano, Ana Esperanza Franco; Friebes, Gernot; Frisch, Andreas; Fryday, Alan; Furci, Giuliana; Marquez, Ricardo Galan; Garbelotto, Matteo; Garcia-Martin, Joaquina Maria; Otalora, Monica A. Garcia; Sanchez, Dania Garcia; Gardiennet, Alain; Garnica, Sigisfredo; Benavent, Isaac Garrido; Gates, Genevieve; Gerlach, Alice da Cruz Lima; Ghobad-Nejhad, Masoomeh; Gibertoni, Tatiana B.; Grebenc, Tine; Greilhuber, Irmgard; Grishkan, Bella; Groenewald, Johannes Z.; Grube, Martin; Gruhn, Gerald; Gueidan, Cecile; Gulden, Gro; Gusmao, Luis F. P.; Hafellner, Josef; Hairaud, Michel; Halama, Marek; Hallenberg, Nils; Halling, Roy E.; Hansen, Karen; Harder, Christoffer Bugge; Heilmann-Clausen, Jacob; Helleman, Stip; Henriot, Alain; Hernandez-Restrepo, Margarita; Herve, Raphael; Hobart, Caroline; Hoffmeister, Mascha; Hoiland, Klaus; Holec, Jan; Holien, Hakon; Hughes, Karen; Hubka, Vit; Huhtinen, Seppo; Ivancevic, Boris; Jagers, Marian; Jaklitsch, Walter; Jansen, AnnaElise; Jayawardena, Ruvishika S.; Jeppesen, Thomas Stjernegaard; Jeppson, Mikael; Johnston, Peter; Jorgensen, Per Magnus; Karnefelt, Ingvar; Kalinina, Liudmila B.; Kantvilas, Gintaras; Karadelev, Mitko; Kasuya, Taiga; Kautmanova, Ivona; Kerrigan, Richard W.; Kirchmair, Martin; Kiyashko, Anna; Knapp, Daniel G.; Knudsen, Henning; Knudsen, Kerry; Knutsson, Tommy; Kolarik, Miroslav; Koljalg, Urmas; Kosuthova, Alica; Koszka, Attila; Kotiranta, Heikki; Kotkova, Vera; Koukol, Ondrej; Kout, Jiri; Kovacs, Gabor M.; Kriz, Martin; Kruys, Asa; Kudera, Viktor; Kudzma, Linas; Kuhar, Francisco; Kukwa, Martin; Kumar, T. K. Arun; Kunca, Vladimir; Kusan, Ivana; Kuyper, Thomas W.; Lado, Carlos; Laessoe, Thomas; Laine, Patrice; Langer, Ewald; Larsson, Ellen; Larsson, Karl-Henrik; Laursen, Gary; Lechat, Christian; Lee, Serena; Lendemer, James C.; Levin, Laura; Lindemann, Uwe; Lindstrom, Hakan; Liu, Xingzhong; Hernandez, Regulo Carlos Llarena; Llop, Esteve; Locsmandi, Csaba; Lodge, Deborah Jean; Loizides, Michael; Lokos, Laszlo; Luangsa-ard, Jennifer; Luderitz, Matthias; Lumbsch, Thorsten; Lutz, Matthias; Mahoney, Dan; Malysheva, Ekaterina; Malysheva, Vera; Manimohan, Patinjareveettil; Mann-Felix, Yasmina; Marques, Guilhermina; Martinez-Gil, Ruben; Marson, Guy; Mata, Gerardo; Matheny, P. Brandon; Mathiassen, Geir Harald; Matocec, Neven; Mayrhofer, Helmut; Mehrabi, Mehdi; Melo, Ireneia; Mesic, Armin; Methven, Andrew S.; Miettinen, Otto; Romero, Ana M. Millanes; Miller, Andrew N.; Mitchell, James K.; Moberg, Roland; Moreau, Pierre-Arthur; Moreno, Gabriel; Morozova, Olga; Morte, Asuncion; Muggia, Lucia; Gonzalez, Guillermo Munoz; Myllys, Leena; Nagy, Istvan; Nagy, Laszlo G.; Neves, Maria Alice; Niemela, Tuomo; Nimis, Pier Luigi; Niveiro, Nicolas; Noordeloos, Machiel E.; Nordin, Anders; Noumeur, Sara Raouia; Novozhilov, Yuri; Nuytinck, Jorinde; Ohenoja, Esteri; Fiuza, Patricia Oliveira; Orange, Alan; Ordynets, Alexander; Ortiz-Santana, Beatriz; Pacheco, Leticia; Pal-Fam, Ferenc; Palacio, Melissa; Palice, Zdenek; Papp, Viktor; Partel, Kadri; Pawlowska, Julia; Paz, Aurelia; Peintner, Ursula; Pennycook, Shaun; Pereira, Olinto Liparini; Daniels, Pablo Perez; Capella, Miguel A. Perez-De-Gregorio; del Amo, Carlos Manuel Perez; Gorjon, Sergio Perez; Perez-Ortega, Sergio; Perez-Vargas, Israel; Perry, Brian A.; Petersen, Jens H.; Petersen, Ronald H.; Pfister, Donald H.; Phukhamsakda, Chayanard; Piatek, Marcin; Piepenbring, Meike; Pino-Bodas, Raquel; Esquivel, Juan Pablo Pinzon; Pirot, Paul; Popov, Eugene S.; Popoff, Orlando; Alvaro, Maria Prieto; Printzen, Christian; Psurtseva, Nadezhda; Purahong, Witoon; Quijada, Luis; Rambold, Gerhard; Ramirez, Natalia A.; Raja, Huzefa; Raspe, Olivier; Raymundo, Tania; Reblova, Martina; Rebriev, Yury A.; Garcia, Juan de Dios Reyes; Ripoll, Miguel Angel Ribes; Richard, Franck; Richardson, Mike J.; Rico, Victor J.; Robledo, Gerardo Lucio; Barbosa, Flavia Rodrigues; Rodriguez-Caycedo, Cristina; Rodriguez-Flakus, Pamela; Ronikier, Anna; Casas, Luis Rubio; Rusevska, Katerina; Saar, Gunter; Saar, Irja; Salcedo, Isabel; Martinez, Sergio M. Salcedo; Montoya, Carlos A. Salvador; Sanchez-Ramirez, Santiago; Sandoval-Sierra, J. Vladimir; Santamaria, Sergi; Monteiro, Josiane Santana; Schroers, Hans Josef; Schulz, Barbara; Schmidt-Stohn, Geert; Schumacher, Trond; Senn-Irlet, Beatrice; Sevcikova, Hana; Shchepin, Oleg; Shirouzu, Takashi; Shiryaev, Anton; Siepe, Klaus; Sir, Esteban B.; Sohrabi, Mohammad; Soop, Karl; Spirin, Viacheslav; Spribille, Toby; Stadler, Marc; Stalpers, Joost; Stenroos, Soili; Suija, Ave; Sunhede, Stellan; Svantesson, Sten; Svensson, Sigvard; Svetasheva, Tatyana Yu; Swierkosz, Krzysztof; Tamm, Heidi; Taskin, Hatira; Taudiere, Adrien; Tedebrand, Jan-Olof; Lahoz, Raul Tena; Temina, Marina; Thell, Arne; Thines, Marco; Thor, Goren; Thus, Holger; Tibell, Leif; Tibell, Sanja; Timdal, Einar; Tkalcec, Zdenko; Tonsberg, Tor; Trichies, Gerard; Triebel, Dagmar; Tsurykau, Andrei; Tulloss, Rodham E.; Tuovinen, Veera; Sosa, Miguel Ulloa; Urcelay, Carlos; Valade, Francois; Garza, Ricardo Valenzuela; van den Boom, Pieter; Van Vooren, Nicolas; Vasco-Palacios, Aida M.; Vauras, Jukka; Santos, Juan Manuel Velasco; Vellinga, Else; Verbeken, Annemieke; Vetlesen, Per; Vizzini, Alfredo; Voglmayr, Hermann; Volobuev, Sergey; von Brackel, Wolfgang; Voronina, Elena; Walther, Grit; Watling, Roy; Weber, Evi; Wedin, Mats; Weholt, Oyvind; Westberg, Martin; Yurchenko, Eugene; Zehnalek, Petr; Zhang, Huang; Zhurbenko, Mikhail P.; Ekmani, Stefan (2018)
    Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative taxa from environmental DNA sequences), have been submitted to be voted on at the 11th International Mycological Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among taxa and find that alleles may not consistently and uniquely represent the species within which they are contained. Should the proposals be accepted, the meaning of nomenclatural types would change in a fundamental way from physical objects as sources of data to the data themselves. Such changes are conducive to irreproducible science, the potential typification on artefactual data, and massive creation of names with low information content, ultimately causing nomenclatural instability and unnecessary work for future researchers that would stall future explorations of fungal diversity. We conclude that the acceptance of DNA sequences alone as types of names of taxa, under the terms used in the current proposals, is unnecessary and would not solve the problem of naming putative taxa known only from DNA sequences in a scientifically defensible way. As an alternative, we highlight the use of formulas for naming putative taxa (candidate taxa) that do not require any modification of the ICN.
  • Lewis, Samuel H.; Salmela, Heli; Obbard, Darren J. (2016)
    Genetic studies of Drosophila melanogaster have provided a paradigm for RNA interference (RNAi) in arthropods, in which the microRNA and antiviral pathways are each mediated by a single Argonaute (Ago1 and Ago2) and germline suppression of transposable elements is mediated by a trio of Piwi-subfamily Argonaute proteins (Ago3, Aub, and Piwi). Without a suitable evolutionary context, deviations from this can be interpreted as derived or idiosyncratic. Here we analyze the evolution of Argonaute genes across the genomes and transcriptomes of 86 Dipteran species, showing that variation in copy number can occur rapidly, and that there is constant flux in some RNAi mechanisms. The lability of the RNAi pathways is illustrated by the divergence of Aub and Piwi (182-156Ma), independent origins of multiple Piwi-family genes in Aedes mosquitoes (less than 25Ma), and the recent duplications of Ago2 and Ago3 in the tsetse fly Glossina morsitans. In each case the tissue specificity of these genes has altered, suggesting functional divergence or innovation, and consistent with the action of dynamic selection pressures across the Argonaute gene family. We find there are large differences in evolutionary rates and gene turnover between pathways, and that paralogs of Ago2, Ago3, and Piwi/Aub show contrasting rates of evolution after duplication. This suggests that Argonautes undergo frequent evolutionary expansions that facilitate functional divergence.
  • Petersen, Jessica L.; Mickelson, James R.; Rendahl, Aaron K.; Valberg, Stephanie J.; Andersson, Lisa S.; Axelsson, Jeanette; Bailey, Ernie; Bannasch, Danika; Binns, Matthew M.; Borges, Alexandre S.; Brama, Pieter; Machado, Artur da Camara; Capomaccio, Stefano; Cappelli, Katia; Cothran, E. Gus; Distl, Ottmar; Fox-Clipsham, Laura; Graves, Kathryn T.; Guerin, Gerard; Haase, Bianca; Hasegawa, Telhisa; Hemmann, Karin; Hill, Emmeline W.; Leeb, Tosso; Lindgren, Gabriella; Lohi, Hannes; Lopes, Maria Susana; McGivney, Beatrice A.; Mikko, Sofia; Orr, Nicholas; Penedo, M. Cecilia T.; Piercy, Richard J.; Raekallio, Marja; Rieder, Stefan; Røed, Knut H.; Swinburne, June; Tozaki, Teruaki; Vaudin, Mark; Wade, Claire M.; McCue, Molly E. (2013)
  • Pritchard, Victoria L.; Makinen, Hannu; Vähä, Juha-Pekka; Erkinaro, Jaakko; Orell, Panu; Primmer, Craig R. (2018)
    Elucidating the genetic basis of adaptation to the local environment can improve our understanding of how the diversity of life has evolved. In this study, we used a dense SNP array to identify candidate loci potentially underlying fine-scale local adaptation within a large Atlantic salmon (Salmo salar) population. By combining outlier, gene-environment association and haplotype homozygosity analyses, we identified multiple regions of the genome with strong evidence for diversifying selection. Several of these candidate regions had previously been identified in other studies, demonstrating that the same loci could be adaptively important in Atlantic salmon at subdrainage, regional and continental scales. Notably, we identified signals consistent with local selection around genes associated with variation in sexual maturation, energy homeostasis and immune defence. These included the large-effect age-at-maturity gene vgll3, the known obesity gene mc4r, and major histocompatibility complex II. Most strikingly, we confirmed a genomic region on Ssa09 that was extremely differentiated among subpopulations and that is also a candidate for local selection over the global range of Atlantic salmon. This region colocalized with a haplotype strongly associated with spawning ecotype in sockeye salmon (Oncorhynchus nerka), with circumstantial evidence that the same gene (six6) may be the selective target in both cases. The phenotypic effect of this region in Atlantic salmon remains cryptic, although allelic variation is related to upstream catchment area and covaries with timing of the return spawning migration. Our results further inform management of Atlantic salmon and open multiple avenues for future research.
  • Vaysse, Amaury; Ratnakumar, Abhirami; Derrien, Thomas; Axelsson, Erik; Pielberg, Gerli Rosengren; Sigurdsson, Snaevar; Fall, Tove; Seppala, Eija H.; Hansen, Mark S. T.; Lawley, Cindy T.; Karlsson, Elinor K.; Bannasch, Danika; Vila, Carles; Lohi, Hannes; Galibert, Francis; Fredholm, Merete; Haggstrom, Jens; Hedhammar, Ake; Andre, Catherine; Lindblad-Toh, Kerstin; Hitte, Christophe; Webster, Matthew T.; LUPA Consortium (2011)
  • Mohandesan, Elmira; Fitak, Robert R.; Corander, Jukka; Yadamsuren, Adiya; Chuluunbat, Battsetseg; Abdelhadi, Omer; Raziq, Abdul; Nagy, Peter; Stalder, Gabrielle; Walzer, Chris; Faye, Bernard; Burger, Pamela A. (2017)
    The genus Camelus is an interesting model to study adaptive evolution in the mitochondrial genome, as the three extant Old World camel species inhabit hot and low-altitude as well as cold and high-altitude deserts. We sequenced 24 camel mitogenomes and combined them with three previously published sequences to study the role of natural selection under different environmental pressure, and to advance our understanding of the evolutionary history of the genus Camelus. We confirmed the heterogeneity of divergence across different components of the electron transport system. Lineage-specific analysis of mitochondrial protein evolution revealed a significant effect of purifying selection in the concatenated protein-coding genes in domestic Bactrian camels. The estimated dN/dS