Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia)
- Autores
- Torgasheva, Anna A.; Savchenko, Ekaterina; Gomez Fernandez, Maria Jimena; Mirol, Patricia Monica; Borodin, Pavel M.
- Año de publicación
- 2016
- Idioma
- ruso
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Fil: Torgasheva, Anna A.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia
Fil: Savchenko, Ekaterina. Institute of Cytology and Genetics; Rusia
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
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
Fil: Borodin, Pavel M.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia - Materia
-
Speciation
Tuco-Tuco
Chromosomes
Immunolocalization
Meiosis
Recombination - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/49341
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Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia)Хромосомы и видообразование у туко-туко (Ctenomys, Hystricognathi, Rodentia)Torgasheva, Anna A.Savchenko, EkaterinaGomez Fernandez, Maria JimenaMirol, Patricia MonicaBorodin, Pavel M.SpeciationTuco-TucoChromosomesImmunolocalizationMeiosisRecombinationhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Tuco-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.Fil: Torgasheva, Anna A.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; RusiaFil: Savchenko, Ekaterina. Institute of Cytology and Genetics; RusiaFil: Gomez Fernandez, Maria Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Mirol, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Borodin, Pavel M.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; RusiaInstitute of Cytology and Genetics of Siberian Branch of the Russian Academy of Sciences2016-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/49341Torgasheva, 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; 408-4152500-04622500-3259CONICET DigitalCONICETrusinfo:eu-repo/semantics/altIdentifier/url/http://vavilov.elpub.ru/jour/article/view/693info:eu-repo/semantics/altIdentifier/doi/10.18699/VJ16.170info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:45:27Zoai:ri.conicet.gov.ar:11336/49341instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:45:27.812CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) Хромосомы и видообразование у туко-туко (Ctenomys, Hystricognathi, Rodentia) |
title |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
spellingShingle |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) Torgasheva, Anna A. Speciation Tuco-Tuco Chromosomes Immunolocalization Meiosis Recombination |
title_short |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
title_full |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
title_fullStr |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
title_full_unstemmed |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
title_sort |
Chromosomes and speciation in tuco-tuco (Ctenomys, Hystricognathi, Rodentia) |
dc.creator.none.fl_str_mv |
Torgasheva, Anna A. Savchenko, Ekaterina Gomez Fernandez, Maria Jimena Mirol, Patricia Monica Borodin, Pavel M. |
author |
Torgasheva, Anna A. |
author_facet |
Torgasheva, Anna A. Savchenko, Ekaterina Gomez Fernandez, Maria Jimena Mirol, Patricia Monica Borodin, Pavel M. |
author_role |
author |
author2 |
Savchenko, Ekaterina Gomez Fernandez, Maria Jimena Mirol, Patricia Monica Borodin, Pavel M. |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Speciation Tuco-Tuco Chromosomes Immunolocalization Meiosis Recombination |
topic |
Speciation Tuco-Tuco Chromosomes Immunolocalization Meiosis Recombination |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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. Fil: Torgasheva, Anna A.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia Fil: Savchenko, Ekaterina. Institute of Cytology and Genetics; Rusia 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 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 Fil: Borodin, Pavel M.. Novosibirsk State University; Rusia. Institute of Cytology and Genetics; Rusia |
description |
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. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-09 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/49341 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 2500-0462 2500-3259 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/49341 |
identifier_str_mv |
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 2500-0462 2500-3259 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
rus |
language |
rus |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://vavilov.elpub.ru/jour/article/view/693 info:eu-repo/semantics/altIdentifier/doi/10.18699/VJ16.170 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Institute of Cytology and Genetics of Siberian Branch of the Russian Academy of Sciences |
publisher.none.fl_str_mv |
Institute of Cytology and Genetics of Siberian Branch of the Russian Academy of Sciences |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.13397 |