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dc.contributor.author Torgasheva, Anna A.
dc.contributor.author Savchenko, Ekaterina
dc.contributor.author Gomez Fernandez, Maria Jimena
dc.contributor.author Mirol, Patricia Monica
dc.contributor.author Borodin, Pavel M.
dc.date.available 2018-06-19T18:01:17Z
dc.date.issued 2016-09
dc.identifier.citation Torgasheva, Anna A.; Savchenko, Ekaterina; Gomez Fernandez, Maria Jimena; Mirol, Patricia Monica; Borodin, Pavel M.; Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia); Institute of Cytology and Genetics of Siberian Branch of the Russian Academy of Sciences; Vavilov Journal of Genetics and Breeding; 20; 4; 9-2016; 408-415
dc.identifier.issn 2500-0462
dc.identifier.uri http://hdl.handle.net/11336/49341
dc.description.abstract Tuco-tucos, South American rodents of the genus Ctenomys represent an interesting model of speciation. Their strict territorial and solitary life under the earth, vast but highly fragmented habitats, low migration activity were the causes of their very fast radiation. About 60 species of this genus have been described. They are found in a variety of habitats, from the mountains of the Andes to the coastal dunes of the Atlantic, from humid steppes of Pampas to dry deserts of Chaco. Tuco-tucos have a very high level of chromosomal polymorphism and polytypism based on Robertsonian and whole-arm reciprocal translocations and inversions, and can therefore be used to test different versions of chromosomal speciation hypothesis. The classic version of this hypothesis emphasizes the sterility of the hybrids, due to incorrect or incomplete chromosome synapsis in heterozygotes for rearrangements, germ cells death, chromosome nondisjunction and the generation of unbalanced gametes. The modern version of chromosomal speciation hypothesis suggests that the reduction of gene flow across chromosomal hybrid zones is due to the suppression of recombination in hybrids around the break points of rearrangements distinguishing the parental species. Field studies have not revealed strong negative effects of chromosomal heterozygosity on the fitness of the carriers. These results cast doubt on the validity of the classic version of the hypothesis. Analysis of chromosome behavior in the meiotic prophase in the chromosomal heterozygotes revealed significant changes in the frequency and distribution of recombination: crossingover suppression around the breakpoint and chiasma distalization. These changes can modulate the flow of genes between chromosomal races and amplify the divergence which has arisen due to spatial isolation. These data confirm the recombinational model of chromosomal speciation.
dc.format application/pdf
dc.language.iso O
dc.publisher Institute of Cytology and Genetics of Siberian Branch of the Russian Academy of Sciences
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by/2.5/ar/
dc.subject Speciation
dc.subject Tuco-tuco
dc.subject Chromosomes
dc.subject Immunolocalization
dc.subject Meiosis
dc.subject Recombination
dc.subject.classification Otras Ciencias Biológicas
dc.subject.classification Ciencias Biológicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia)
dc.title Хромосомы и видообразование у туко-туко (Ctenomys, Hystricognathi, Rodentia)
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-05-30T15:14:49Z
dc.identifier.eissn 2500-3259
dc.journal.volume 20
dc.journal.number 4
dc.journal.pagination 408-415
dc.journal.pais Rusia
dc.description.fil Fil: Torgasheva, Anna A.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia
dc.description.fil Fil: Savchenko, Ekaterina. Institute of Cytology and Genetics; Rusia
dc.description.fil Fil: Gomez Fernandez, Maria Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil Fil: Mirol, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
dc.description.fil Fil: Borodin, Pavel M.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia
dc.journal.title Vavilov Journal of Genetics and Breeding
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://vavilov.elpub.ru/jour/article/view/693
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.18699/VJ16.170
dc.conicet.fuente individual


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)