title: Variations of chromosomal structures in Caluromys philander (Didelphimorphia: Didelphidae) from the Amazon region.
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.
authors.affiliation: Coordenação de Biodiversidade, Laboratório de Genética Animal, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo 2936, Aleixo, Manaus, AM, Brazil. souza.ems@hotmail.com
authors.forename: Erica Martinha Silva de
authors.initials: EM
authors.lastname: Souza
authors.forename: Carlos Eduardo
authors.initials: CE
authors.lastname: Faresin e Silva
authors.forename: Eduardo Schmidt
authors.initials: ES
authors.lastname: Eler
authors.forename: Maria Nazareth F da
authors.initials: MN
authors.lastname: Silva
authors.forename: Eliana
authors.initials: E
authors.lastname: Feldberg
mesh_terms: D000818:Animals; D001938:Brazil; D007446:Chromosome Inversion; D048293:Didelphis / Q000235:genetics*; D004171:Diploidy; D017753:Ecosystem; D005260:Female; D011110:Polymorphism, Genetic; D011153:Population / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D016615:Telomere / Q000235:genetics; D014960:X Chromosome / Q000235:genetics*
chemical_list: D012337:RNA, Ribosomal, 18S