Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)

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Rodents are a very diverse group with large chromosome variability. One of the most species rich linage in the Neotropics is the Sigmodontinae. Among them, the tribe Abrotrichini was recently defined and its taxonomy and phylogeny were mostly elucidated through molecular and morphological evidence....

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Detalles Bibliográficos
Autores principales: Da Rosa, F.A., Ojeda, Agustina A., Novillo, Agustina, Labaroni, Carolina A., Buschiazzo, Leandro Maciel, Teta, Pablo Vicente, Cálcena, E. N., Bolzán, Alejandro Daniel, Ojeda, Ricardo A., Lanzone, Cecilia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Zoología
Cytogenetic
Diversification
Molecular variability
Rodentia
South America
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/136325
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-136325
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Zoología
Cytogenetic
Diversification
Molecular variability
Rodentia
South America
spellingShingle Zoología
Cytogenetic
Diversification
Molecular variability
Rodentia
South America
Da Rosa, F.A.
Ojeda, Agustina A.
Novillo, Agustina
Labaroni, Carolina A.
Buschiazzo, Leandro Maciel
Teta, Pablo Vicente
Cálcena, E. N.
Bolzán, Alejandro Daniel
Ojeda, Ricardo A.
Lanzone, Cecilia
Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
topic_facet Zoología
Cytogenetic
Diversification
Molecular variability
Rodentia
South America
description Rodents are a very diverse group with large chromosome variability. One of the most species rich linage in the Neotropics is the Sigmodontinae. Among them, the tribe Abrotrichini was recently defined and its taxonomy and phylogeny were mostly elucidated through molecular and morphological evidence. Meanwhile, chromosome data were only secondarily used because of fragmentary information. In this contribution, we conduct a chromosome characterization of Abrothrix hirta, A. olivacea, A. andina, and Paynomys macronyx, review the cytogenetic background of the tribe, and contrast it with molecular data. Chromosomes were analyzed by conventional and differential techniques. All Abrothrix species presented 2n = 52/FNa = 56, with a high similarity in the banding patterns reflecting a conserved karyotype, which does not coincide with its high molecular variability. In turn, P. macronyx have 2n = 54/FNa = 58–59, varying due to a heteromorphic pair of autosomes. In addition, in this last species, different morphologies of the X chromosome and the presence of B chromosomes were detected. Heterochromatin was involved in these variants. The telomeric probe in P. macronyx marks terminal regions of all chromosomes. B chromosomes generated strong telomeric signals. The Ag-NORs banding revealed the same patterns in Abrothrix and Paynomys. Cytogenetic data support phylogenetic relationships previously proposed and suggest that the specious genus Abrothrix could have retained the ancestral karyotype of the subfamily. In the tribe, the relatively conserved chromosome complement contrasts with its high molecular variability. This indicates decoupling between the rates of chromosomal and molecular divergence, as observed in other rodent lineages. In abrotrichines, chromosome evolution was slower.
format Articulo
Articulo
author Da Rosa, F.A.
Ojeda, Agustina A.
Novillo, Agustina
Labaroni, Carolina A.
Buschiazzo, Leandro Maciel
Teta, Pablo Vicente
Cálcena, E. N.
Bolzán, Alejandro Daniel
Ojeda, Ricardo A.
Lanzone, Cecilia
author_facet Da Rosa, F.A.
Ojeda, Agustina A.
Novillo, Agustina
Labaroni, Carolina A.
Buschiazzo, Leandro Maciel
Teta, Pablo Vicente
Cálcena, E. N.
Bolzán, Alejandro Daniel
Ojeda, Ricardo A.
Lanzone, Cecilia
author_sort Da Rosa, F.A.
title Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
title_short Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
title_full Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
title_fullStr Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
title_full_unstemmed Chromosome variability and evolution in rodents of the tribe Abrotrichini (Rodentia, Cricetidae, Sigmodontinae)
title_sort chromosome variability and evolution in rodents of the tribe abrotrichini (rodentia, cricetidae, sigmodontinae)
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/136325
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