title: Multiple sex chromosome systems in howler monkeys (Platyrrhini, Alouatta).
abstract: In light of the multiple sex chromosome systems observed in howler monkeys (Alouatta Lacépède, 1799) a combined cladistic analysis using chromosomal and molecular characters was applied to discuss the possible origin of these systems. Mesoamerican and South American howlers were karyologically compared. FISH analysis using the chromosome painting probes for the #3 and #15 human chromosomes was applied to corroborate the homeology of the sexual systems. We found that the HSA3/15 syntenic association, present in the sex chromosome systems of South American Howlers, is not present in those of Mesoamerican ones. The autosomes involved in the translocation that formed the sexual systems in the Mesoamerican and South American species are different, thus suggesting an independent origin. Parsimony analysis resolved the phylogenetic relationships among howler species, demonstrating utility of the combined approach. A hypothesis for the origin of the multiple sex chromosome systems for the genus is proposed.
authors.affiliation: Grupo de Investigación en Biología Evolutiva (GIBE) - Departamento de Ecología, Genética y Evolución - Facultad de Ciencias Exactas y Naturales - Universidad de Buenos Aires - IEGEBA (CONICET-UBA) - Ciudad Universitaria - Pab. II -4° piso - Labs 43-46 - (C1428EGA) - Buenos Aires - Argentina.
authors.forename: Eliana Ruth
authors.initials: ER
authors.lastname: Steinberg
authors.affiliation: Grupo de Investigación en Biología Evolutiva (GIBE) - Departamento de Ecología, Genética y Evolución - Facultad de Ciencias Exactas y Naturales - Universidad de Buenos Aires - IEGEBA (CONICET-UBA) - Ciudad Universitaria - Pab. II -4° piso - Labs 43-46 - (C1428EGA) - Buenos Aires - Argentina.
authors.forename: Mariela
authors.initials: M
authors.lastname: Nieves
authors.affiliation: Grupo de Investigación en Biología Evolutiva (GIBE) - Departamento de Ecología, Genética y Evolución - Facultad de Ciencias Exactas y Naturales - Universidad de Buenos Aires - IEGEBA (CONICET-UBA) - Ciudad Universitaria - Pab. II -4° piso - Labs 43-46 - (C1428EGA) - Buenos Aires - Argentina.
authors.forename: Marta Dolores
authors.initials: MD
authors.lastname: Mudry
keywords: FISH; Multiple sex chromosome systems; Neotropical Primates; combined phylogenetic analysis; cytochrome b
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