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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae)

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Galindo, David Javier [1] ; Martins, Gabriela Siqueira [2] ; Vozdova, Miluse [3] ; Cernohorska, Halina [3] ; Kubickova, Svatava [3] ; Bernegossi, Agda Maria [1] ; Kadlcikova, Dita [3] ; Rubes, Jiri [3] ; Duarte, Jose Mauricio Barbanti [1]
Total Authors: 9
[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Nucleo Pesquisa & Conservacao Cervideos, NUPECCE, UNESP, BR-14884900 Jaboticabal - Brazil
[2] Univ Sao Paulo, Lab Dosagens Hormonais, Fac Med Vet & Zootecnia, BR-05508270 Sao Paulo - Brazil
[3] Cent European Inst Technol, Vet Res Inst, Dept Genet & Reprod Biotechnol, Brno 62100 - Czech Republic
Total Affiliations: 3
Document type: Journal article
Source: GENES; v. 12, n. 2 FEB 2021.
Web of Science Citations: 0

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 x 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 x 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 x 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 x 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. (AU)

FAPESP's process: 17/07014-8 - The use of actual topotypes to produce genotypes and cytotypes in the taxonomic review of the Mazama genus: the basis for the species conservation
Grantee:José Maurício Barbanti Duarte
Support type: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 10/50748-3 - The gray brockets in Brazil (Mammalia; Cervidae; Mazama): detection of the genetic, morphologic and ecologic variants to explain the complex evolution in this group
Grantee:José Maurício Barbanti Duarte
Support type: Research Projects - Thematic Grants
FAPESP's process: 19/06940-1 - The use of molecular cytogenetics for evolutioonary and taxonomic studies in Cervidae
Grantee:José Maurício Barbanti Duarte
Support type: Regular Research Grants