New Karyotype Information for Ctenomys (Rodentia: Ctenomyidae) from Midwest and Northern Brazil.

Autor:	de Oliveira TD; Departamento de zoologia, Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil., Bertocchi NA; Fundação Oswaldo Cruz, Fiocruz Mata Atlântica, Rio de Janeiro, Brazil., Kubiak BB; Departamento de zoologia, Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil., Galiano D; Programa de Pós-Graduação em Ciência e Tecnologia Ambiental, Universidade Federal da Fronteira Sul, Erechim, Brazil., Althoff SL; Departamento de Ciências Naturais, Programa de Pós-Graduação em Biodiversidade, Universidade Regional de Blumenau, Blumenau, Brazil., de Freitas TRO; Departamento de zoologia, Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.; Departamento de genética, Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Jazyk:	angličtina
Zdroj:	Cytogenetic and genome research [Cytogenet Genome Res] 2024; Vol. 164 (1), pp. 33-42. Date of Electronic Publication: 2024 Feb 23.
DOI:	10.1159/000538014
Abstrakt:	Introduction: Its wide karyotypic variation characterizes the genus Ctenomys, and in Brazil, the genus is distributed in the country's southern, Midwest, and northern regions. Recently, populations of Ctenomys have been found in the Midwest and northern Brazil, with two new lineages named C. sp. "xingu" and C. sp. "central." Methods: This work combines classical cytogenetic and molecular analyses to provide new chromosomal information on the boliviensis group distributed in northern and Midwestern Brazil. This includes the validation of the karyotype of C. bicolor and C. nattereri and the description of the karyotype of C. sp. "xingu" and C. sp. "central." Results: We found three different karyotypes: 2n = 40 for C. bicolor; 2n = 36 for C. nattereri, and specimens from a locality belonging to C. sp. "central"; 2n = 34 for the lineage C. sp. "xingu" and specimens from a locality belonging to C. sp. "central." Furthermore, GTG banding revealed homologous chromosomes between species/lineages and allowed the identification of the rearrangements that occurred, which proved the occurrence of fissions. Conclusion: Considering our results on the variation of 2n in the boliviensis group, we found two possibilities: the first, deduced by parsimony, is that 2n = 36 appeared initially, and two fissions produced gave rise to 2n = 40, and an independent fusion gave rise to 2n = 34 from 2n = 36; moreover, the second explanation is that all karyotypes arose independently. (© 2024 S. Karger AG, Basel.)
Databáze:	MEDLINE
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