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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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Pensoft Publishers
2016
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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. |
format | Online Article Text |
id | pubmed-4856931 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Pensoft Publishers |
record_format | MEDLINE/PubMed |
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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