Chromosomal polymorphism and speciation: The case of the genus mazama (cetartiodactyla; cervidae)
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Data
2021-02-01
Autores
Galindo, David Javier [UNESP]
Martins, Gabriela Siqueira
Vozdova, Miluse
Cernohorska, Halina
Kubickova, Svatava
Bernegossi, Agda Maria [UNESP]
Kadlcikova, Dita
Rubes, Jiri
Duarte, José Maurício Barbanti [UNESP]
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Resumo
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.
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Cytogenetics, Hybrids, Neotropical deer, Post-zygotic barrier, Sperm-FISH
Como citar
Genes, v. 12, n. 2, p. 1-16, 2021.