Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus

Autores
Zambelli, Andrés; Arbeletche de Vidal Rioja, Lidia Beatriz
Año de publicación
1996
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Graomys griseoflavus is a South American phyllotine rodent having a remarkable Robertsonian polymorphism which may have produced reproductive isolation between 2n=42−41 and 2n=38−34 karyomorphs. Analysis of nucleolar organizer region (NOR) locations both by silver staining (Ag-NOR) and in situ hybridization revealed that 2n=42 individuals exhibit highly variable Ag-NOR patterns, while specimens of the 2n=38−34 karyomorphic group showed a single Ag-NOR pattern. The latter animals underwent two NOR deletions in reference to the 2n=42 karyomorphs, one of which would be the consequence of a Robertsonian fusion and the other would be produced by the unequal crossing-over mechanism. The differential NOR homogenization supports the hypothesis that G. griseoflavus karyomorphs are evolving separately towards the acquisition of separate species status.
Instituto Multidisciplinario de Biología Celular
Materia
Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/140089
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/140089
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavusZambelli, AndrésArbeletche de Vidal Rioja, Lidia BeatrizBiologíaCiencias ExactasGraomys griseoflavusRobertsonian polymorphismNucleolar organizer regionGraomys griseoflavus is a South American phyllotine rodent having a remarkable Robertsonian polymorphism which may have produced reproductive isolation between 2n=42−41 and 2n=38−34 karyomorphs. Analysis of nucleolar organizer region (NOR) locations both by silver staining (Ag-NOR) and in situ hybridization revealed that 2n=42 individuals exhibit highly variable Ag-NOR patterns, while specimens of the 2n=38−34 karyomorphic group showed a single Ag-NOR pattern. The latter animals underwent two NOR deletions in reference to the 2n=42 karyomorphs, one of which would be the consequence of a Robertsonian fusion and the other would be produced by the unequal crossing-over mechanism. The differential NOR homogenization supports the hypothesis that G. griseoflavus karyomorphs are evolving separately towards the acquisition of separate species status.Instituto Multidisciplinario de Biología Celular1996info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf53-57http://sedici.unlp.edu.ar/handle/10915/140089enginfo:eu-repo/semantics/altIdentifier/issn/0016-6707info:eu-repo/semantics/altIdentifier/issn/1573-6857info:eu-repo/semantics/altIdentifier/doi/10.1007/bf00120218info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-17T10:14:50Zoai:sedici.unlp.edu.ar:10915/140089Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-17 10:14:50.758SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
title Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
spellingShingle Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
Zambelli, Andrés
Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
title_short Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
title_full Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
title_fullStr Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
title_full_unstemmed Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
title_sort Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
dc.creator.none.fl_str_mv Zambelli, Andrés
Arbeletche de Vidal Rioja, Lidia Beatriz
author Zambelli, Andrés
author_facet Zambelli, Andrés
Arbeletche de Vidal Rioja, Lidia Beatriz
author_role author
author2 Arbeletche de Vidal Rioja, Lidia Beatriz
author2_role author
dc.subject.none.fl_str_mv Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
topic Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
dc.description.none.fl_txt_mv Graomys griseoflavus is a South American phyllotine rodent having a remarkable Robertsonian polymorphism which may have produced reproductive isolation between 2n=42−41 and 2n=38−34 karyomorphs. Analysis of nucleolar organizer region (NOR) locations both by silver staining (Ag-NOR) and in situ hybridization revealed that 2n=42 individuals exhibit highly variable Ag-NOR patterns, while specimens of the 2n=38−34 karyomorphic group showed a single Ag-NOR pattern. The latter animals underwent two NOR deletions in reference to the 2n=42 karyomorphs, one of which would be the consequence of a Robertsonian fusion and the other would be produced by the unequal crossing-over mechanism. The differential NOR homogenization supports the hypothesis that G. griseoflavus karyomorphs are evolving separately towards the acquisition of separate species status.
Instituto Multidisciplinario de Biología Celular
description Graomys griseoflavus is a South American phyllotine rodent having a remarkable Robertsonian polymorphism which may have produced reproductive isolation between 2n=42−41 and 2n=38−34 karyomorphs. Analysis of nucleolar organizer region (NOR) locations both by silver staining (Ag-NOR) and in situ hybridization revealed that 2n=42 individuals exhibit highly variable Ag-NOR patterns, while specimens of the 2n=38−34 karyomorphic group showed a single Ag-NOR pattern. The latter animals underwent two NOR deletions in reference to the 2n=42 karyomorphs, one of which would be the consequence of a Robertsonian fusion and the other would be produced by the unequal crossing-over mechanism. The differential NOR homogenization supports the hypothesis that G. griseoflavus karyomorphs are evolving separately towards the acquisition of separate species status.
publishDate 1996
dc.date.none.fl_str_mv 1996
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/140089
url http://sedici.unlp.edu.ar/handle/10915/140089
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0016-6707
info:eu-repo/semantics/altIdentifier/issn/1573-6857
info:eu-repo/semantics/altIdentifier/doi/10.1007/bf00120218
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
53-57
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.004268

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