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Variations of chromosomal structures in Caluromys philander (Didelphimorphia: Didelphidae) from the Amazon region

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Abstract

Caluromys is considered to be one of the most ancient genera of extant marsupials and is positioned among the basal taxa of the family Didelphidae. At least two species occur in Brazil, C. philander and C. lanatus, both of which have 2n = 14 chromosomes. For the first time, we present evidence of an intrapopulation polymorphism of the sexual chromosome pair in C. philander females from the Central Amazon region. Detailed cytogenetic results of animals from three localities on the Amazon region were analyzed using classical cytogenetics (NOR, C-Band and G-Band) and molecular techniques (18S rDNA and telomere probes). Similar to other conspecific individuals, the diploid number of these animals is 2n = 14, and their fundamental number is 24, with NOR present on the 6th autosomal pair. The X chromosome presented variation detectable by G banding, suggesting a pericentric inversion.

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Acknowledgments

The authors would like to thank RA Andrade and MAA Schetino for their help with field work; CH Schneider and MC Gross for their assistance in the laboratory and helpful tips. This work was supported by the Instituto Nacional de Pesquisas da Amazônia (INPA) through the Research Institutional Projects (PRJ.05-73), Petrobrás S/A. EMS Souza - received a studentship from the Fundação de Amparo à Pesquisa no Amazonas (FAPEAM).

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  1. Coordenação de Biodiversidade, Laboratório de Genética Animal, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Aleixo, Manaus, AM, 69060-001, Brazil

    Érica Martinha Silva de Souza, Carlos Eduardo Faresin e Silva, Eduardo Schmidt Eler & Eliana Feldberg

  2. Coordenação de Biodiversidade, Coleção de Mamíferos, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Aleixo, Manaus, AM, 69060-001, Brazil

    Maria Nazareth F. da Silva

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  1. Érica Martinha Silva de Souza
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  2. Carlos Eduardo Faresin e Silva
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  3. Eduardo Schmidt Eler
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  4. Maria Nazareth F. da Silva
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  5. Eliana Feldberg
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Correspondence to Érica Martinha Silva de Souza.

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de Souza, É.M.S., e Silva, C.E.F., Eler, E.S. et al. Variations of chromosomal structures in Caluromys philander (Didelphimorphia: Didelphidae) from the Amazon region. Genetica 141, 89–93 (2013). https://doi.org/10.1007/s10709-013-9708-7

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  • DOI: https://doi.org/10.1007/s10709-013-9708-7

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