Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)

Abstract. The genus Akodon Meyen, 1833 is one of the most species-rich among sigmodontine rodents and has great chromosome variability. Akodon montensis has a relatively broad distribution in South America, and Argentine populations are located in the southernmost region of its range. Brazilian popu...

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Autores principales: Malleret, Matías Maximiliano, Labaroni, Carolina Alicia, García, Gabriela Verónica, Ferro, Juan Martín, Martí, Dardo Andrea, Lanzone, Cecilia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Pensoft Publishers 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4856931/
https://www.ncbi.nlm.nih.gov/pubmed/27186343
http://dx.doi.org/10.3897/CompCytogen.v10i1.6420
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author Malleret, Matías Maximiliano
Labaroni, Carolina Alicia
García, Gabriela Verónica
Ferro, Juan Martín
Martí, Dardo Andrea
Lanzone, Cecilia
author_facet Malleret, Matías Maximiliano
Labaroni, Carolina Alicia
García, Gabriela Verónica
Ferro, Juan Martín
Martí, Dardo Andrea
Lanzone, Cecilia
author_sort Malleret, Matías Maximiliano
collection PubMed
description Abstract. The genus Akodon Meyen, 1833 is one of the most species-rich among sigmodontine rodents and has great chromosome variability. Akodon montensis has a relatively broad distribution in South America, and Argentine populations are located in the southernmost region of its range. Brazilian populations have important chromosomal variability, but cytogenetic data from Argentina are scarce. We performed a chromosome characterization of natural populations of Akodon montensis using conventional staining, C-banding, Ag-NORs and base-specific fluorochromes. A total of 31 specimens from five localities of Misiones Province, in Argentina, were analyzed. The 2n=24 chromosomes was the most frequently observed karyotype. However, five individuals presented 25 chromosomes due to a supernumerary B-chromosome; and one individual had 2n=26 due to one B plus a trisomy for chromosome 11. Additionally, two XY females and two variants of the X chromosomes were found. C-positive centromeric bands occurred in all chromosomes; additional C-bands were observed in some autosomes, the X, Y and B chromosomes. Ag-NORs were observed in five autosomes, and the B chromosome was frequently marked. Fluorochrome banding was similar among karyotypes of the analyzed populations. Comparisons of cytogenetic data among populations of Argentina and Brazil showed the presence of high intraspecific variability in Akodon montensis and some differences among regions.
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spelling pubmed-48569312016-05-16 Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae) Malleret, Matías Maximiliano Labaroni, Carolina Alicia García, Gabriela Verónica Ferro, Juan Martín Martí, Dardo Andrea Lanzone, Cecilia Comp Cytogenet Research Articles Abstract. The genus Akodon Meyen, 1833 is one of the most species-rich among sigmodontine rodents and has great chromosome variability. Akodon montensis has a relatively broad distribution in South America, and Argentine populations are located in the southernmost region of its range. Brazilian populations have important chromosomal variability, but cytogenetic data from Argentina are scarce. We performed a chromosome characterization of natural populations of Akodon montensis using conventional staining, C-banding, Ag-NORs and base-specific fluorochromes. A total of 31 specimens from five localities of Misiones Province, in Argentina, were analyzed. The 2n=24 chromosomes was the most frequently observed karyotype. However, five individuals presented 25 chromosomes due to a supernumerary B-chromosome; and one individual had 2n=26 due to one B plus a trisomy for chromosome 11. Additionally, two XY females and two variants of the X chromosomes were found. C-positive centromeric bands occurred in all chromosomes; additional C-bands were observed in some autosomes, the X, Y and B chromosomes. Ag-NORs were observed in five autosomes, and the B chromosome was frequently marked. Fluorochrome banding was similar among karyotypes of the analyzed populations. Comparisons of cytogenetic data among populations of Argentina and Brazil showed the presence of high intraspecific variability in Akodon montensis and some differences among regions. Pensoft Publishers 2016-02-02 /pmc/articles/PMC4856931/ /pubmed/27186343 http://dx.doi.org/10.3897/CompCytogen.v10i1.6420 Text en Matías Maximiliano Malleret, Carolina Alicia Labaroni, Gabriela Verónica García, Juan Martín Ferro, Dardo Andrea Martí, Cecilia Lanzone http://creativecommons.org/licenses/by/4.0 This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Articles
Malleret, Matías Maximiliano
Labaroni, Carolina Alicia
García, Gabriela Verónica
Ferro, Juan Martín
Martí, Dardo Andrea
Lanzone, Cecilia
Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title_full Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title_fullStr Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title_full_unstemmed Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title_short Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
title_sort chromosomal variation in argentine populations of akodon montensis thomas, 1913 (rodentia, cricetidae, sigmodontinae)
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4856931/
https://www.ncbi.nlm.nih.gov/pubmed/27186343
http://dx.doi.org/10.3897/CompCytogen.v10i1.6420
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