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

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 hybri...

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Detalles Bibliográficos
Autores principales: Zambelli, Andrés, Arbeletche de Vidal Rioja, Lidia Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/140089
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-140089
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
spellingShingle Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
Zambelli, Andrés
Arbeletche de Vidal Rioja, Lidia Beatriz
Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
topic_facet Biología
Ciencias Exactas
Graomys griseoflavus
Robertsonian polymorphism
Nucleolar organizer region
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.
format Articulo
Articulo
author Zambelli, Andrés
Arbeletche de Vidal Rioja, Lidia Beatriz
author_facet Zambelli, Andrés
Arbeletche de Vidal Rioja, Lidia Beatriz
author_sort Zambelli, Andrés
title Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus
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
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/140089
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