Dados do Trabalho

TÍTULO

INTERSPECIFIC CHROMOSOME PAINTING IN PLECTUROCEBUS CALIGATUS (PITHECIIDAE, PRIMATES)

Resumo

The New World primates commonly known as titi monkeys are characterized by a complex taxonomy and great karyotypic diversity. These primates, previously considered as a single genus, Callicebus, have recently been divided into three genera: Callicebus, Cheracebus and Plecturocebus. Plecturocebus is subdivided into the groups P. donacophilus and P. moloch. The latter is composed of 16 species, including P. caligatus. A female specimen of P. caligatus from the Centro de Primatologia do Rio de Janeiro (CPRJ) was cytogenetically analyzed. The chromosome preparations obtained from lymphocyte and fibroblast cultures were used for GTG- and CBG-banding and for fluorescent in situ hybridization (FISH) with individual human chromosome probes (HSA). Our specimen displayed a diploid number (2n) 48 and a fundamental number (NF) 60. Eight human autosomes (HSA 6, 9, 11, 14, 17, 18, 20 e 21) and the X chromosome were conserved in P. caligatus. Three of these chromosomes, HSA 6, 20 and X, hybridized to a whole P. caligatus chromosome, whereas HSA 9, 11, 14, 17, 18 and 21 were associated with other autosomes. Multiple hybridization signals were observed for the remaining human autosomes. Plecturocebus caligatus exhibited the associations HSA 2/16, 3/21, 5/7, 8/18, 10/16 and 14/15 present in the putative Platyrrhini ancestral karyotype. We also detected the association HSA 2/16 with an inversion and the associations HSA 22/2/22, 7/15, 10/11, which are present in the putative Callicebinae ancestral karyotype. Other associations detected were HSA13/21, which is a synapomorphy of P. moloch, and the association HSA 13/17, which suggests a link between the P. moloch group and Callicebus.

Palavras-chave

Platyrrhini, Fluorescent in situ hybridization (FISH), Karyotipic evolution, Titi monkeys

Financiamento

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).