Chromosomal polymorphism and speciation: The case of the genus mazama (cetartiodactyla; cervidae)

• Autor(a) principal: Galindo, David Javier [UNESP]
• Data de Publicação: 2021
• Outros Autores: Martins, Gabriela Siqueira, Vozdova, Miluse, Cernohorska, Halina, Kubickova, Svatava, Bernegossi, Agda Maria [UNESP], Kadlcikova, Dita, Rubes, Jiri, Duarte, José Maurício Barbanti [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.3390/genes12020165; http://hdl.handle.net/11449/208359
• topic: Cytogenetics; Hybrids; Neotropical deer; Post-zygotic barrier; Sperm-FISH

Chromosomal polymorphism plays a major role in speciation processes in mammals with high rates of karyotypic evolution, as observed in the family Cervidae. One remarkable example is the genus Mazama that comprises wide inter-and intra-specific chromosomal variability. To evaluate the impact of chromosomal polymorphisms as reproductive barriers within the genus Mazama, inter-specific hybrids between Mazama gouazoubira and Mazama nemorivaga (MGO × MNE) and intra-specific hybrids between cytotypes of Mazama americana (MAM) differing by a tandem (TF) or centric fusion (Robertsonian translocations—RT) were evaluated. MGO × MNE hybrid fertility was evaluated by the seminal quality and testicular histology. MAM hybrids estimation of the meiotic segregation products was performed by sperm-FISH analysis. MGO × MNE hybrids analyses showed different degrees of fertility reduction, from severe subfertility to complete sterility. Regarding MAM, RT, and TF carriers showed a mean value for alternate segregation rate of 97.74%, and 67.23%, and adjacent segregation rate of 1.80%, and 29.07%, respectively. Our results suggested an efficient post-zygotic barrier represented by severe fertility reduction for MGO × MNE and MAM with heterozygous TF. Nevertheless, RT did not show a severe effect on the reproductive fitness in MAM. Our data support the validity of MGO and MNE as different species and reveals cryptic species within MAM.