Cytogenetic analysis of different Ctenomys (Rodentia, Octodontidae) species from Uruguay using G-banding

Villar, Silvia; Martínez‐López, Wilner; Folle, Gustavo A.; Novello, Alvaro

doi:10.1016/j.mambio.2005.01.003

Cited by 9 publications

(23 citation statements)

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“…This comparative analysis revealed three main characteristics of chromosome evolution in the genus Ctenomys: (a) a significant degree of chromosome homology within this genus, in spite of remarkable differences in 2n and FN values; (b) Robertsonian translocations are the main rearrangements documented in the chromosomal evolution, within this genus in Uruguay (Novello and Lessa 1986;Ortells 1995;Novello and Altuna 2002;Villar et al 2005); (c) frequent occurrence of complex chromosome rearrangements throughout the karyotype evolution, which could have generated some of unidentified G banding patterns. The frequent occurrence of Robertsonian translocations suggests a tendency for gene colinearity conservation through Uruguayan Ctenomys chromosome evolution.…”

Section: Discussionmentioning

confidence: 94%

“…These could lead to the high subdivision of populations which may have enhanced karyotypic evolution. G banded karyotypes of Ctenomys have been reported for several species inhabiting Argentina, Bolivia and Uruguay (Novello and Lessa 1986;Novello et al 1990;Ortells 1995;Novello and Altuna 2002;Villar et al 2005;Cook and Salazar-Bravo 2004). A study of chromosome evolution was developed using G banded karyotypes of the genus Ctenomys from Uruguay and then interpreted in the light of available paleogeographical data.…”

Section: Introductionmentioning

confidence: 96%

“…The Ctenomys genus from South America exhibits the greatest karyotypic variations registered in mammals, with diploid numbers ranging from 2n = 10 to 2n = 70 (Reig and Kiblisky 1969;Gallardo 1979;Anderson et al 1987;Novello and Lessa 1986;Cook et al 1990;Novello et al 1990;Massarini et al 1991;Villar et al 2005). The high variability of this genus contrasts with other related genera of the family Octodontidae which exhibit less karyotypic variation: Spalacopus cyanus 2n = 58, fundamental number (FN) = 108, Aconaemys fuscus, 2n = 56, FN = 106 (Venegas 1975); Octodon degus, 2n = 58, FN = 108 (Fernandez 1968) and Octodontomys gliroides, 2n = 38, FN = 62 (George and Weir 1972).…”

Section: Introductionmentioning

confidence: 99%

“…The wide variation recorded in karyotypes of the genus Ctenomys is the result of different chromosomal rearrangements including Robertsonian translocations, pericentric inversions, and heterochromatin variation (Reig and Kiblisky 1969;Novello and Lessa 1986;Cook et al 1990;Villar et al 2005). In Uruguay, three nominal species have been described: Ctenomys pearsoni, 2n = 70 (Lessa and Langguth 1983) distributed in the southwest; Ctenomys torquatus, 2n = 44 (Reig and Kiblisky 1969;Freitas and Lessa 1984) located in the north; and Ctenomys rionegrensis, 2n = 50 (Reig and Kiblisky 1969) situated in the west of the country.…”

Section: Introductionmentioning

confidence: 99%

“…The species that inhabit the coast of the Río de la Plata constitutes a complex called "Ctenomys pearsoni complex" due to the cranial and penial similarities in morphology features respect to C. pearsoni species. However, there are chromosomal differences among them (Villar et al 2005). An extreme karyotype variation in the genus was found by Parededa and Novello (2012) in the southeast of the Uruguayan coast.…”

Section: Introductionmentioning

confidence: 99%

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G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

2014

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The genus Ctenomys present a wide 2n and fundamental number (FN) variation in Uruguay and throughout their distribution across the south of the Neotropical region. In this study we analyze chromosome variation of this genus in Uruguay using G and C bands. G-band comparison makes clear that this chromosome variation is reduced if we take into account entire chromosomes and chromosome arms homologies. This could be explained as an adaptation to chromosome variation (2n and FN) without changing gene order or linkage groups. On the other hand, C-banding showed a high variability in amount and localization in the karyotypes analyzed here. These differences could be due to differential amplification of the repetitive DNA (RPSC) characteristic of this genus. Nevertheless, other mechanisms could be involved as repetitive DNA interchange at the chromocenters in the meiosis pachytene, where non homologous chromosomes meet. In this scenario, chromosome rearrangements such as Robertsonian translocations and whole chromosome conservation are of particular interest since these provide a way to conserve gene order. Why Ctenomys chromosomes are prone to rearrangements is not clear, albeit several mammal species present a similar picture. This kind of chromosome change could be involved in the maintenance of chromosome order at the nuclear level. In this paper, we present evidence showing that chromosome and genetic changes are not unavoidably related in Ctenomys, which questions the hypothesis about speciation based on chromosomal changes.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

2014

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Karyotypic and molecular polymorphisms in Ctenomys torquatus (Rodentia: Ctenomyidae): taxonomic considerations

et al. 2009

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The rodent genus Ctenomys (tuco-tucos) comprises more than 60 described species, and shows extraordinary inter- and intraspecific karyotypic variation. The most widely distributed species of Ctenomys in Brazil is C. torquatus. Although several cytogenetic studies have been done, the karyotypic variability of this species is still poorly known. In this paper we report two new diploid numbers for C. torquatus: 2n = 40 and 2n = 42, both showing AN = 72. The new distribution limits of C. torquatus here reported include localities in the southern, central and western parts of Rio Grande do Sul (RS) State in southern Brazil. The phylogenetic relationship between C. torquatus from Alegrete, RS, and Ctenomys sp. from Corrientes, Argentina, is described by means of mtDNA cytochrome b analysis. Although both entities share similar karyotypes and sperm morphology, these two species are not phylogenetically close.

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The contribution of incomplete lineage sorting and introgression to the evolutionary history of the fast-evolving genus Ctenomys (Rodentia, Ctenomyidae)

Tomasco

Giorello

Boullosa

et al. 2022

Molecular Phylogenetics and Evolution

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Cytogenetic analysis of different Ctenomys (Rodentia, Octodontidae) species from Uruguay using G-banding

Cited by 9 publications

References 9 publications

G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

Karyotypic and molecular polymorphisms in Ctenomys torquatus (Rodentia: Ctenomyidae): taxonomic considerations

The contribution of incomplete lineage sorting and introgression to the evolutionary history of the fast-evolving genus Ctenomys (Rodentia, Ctenomyidae)

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