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

Núcleo de Pesquisa e Conservação de Cervídeos, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista—NUPECCE/FCAV/UNESP, 14884-900 Jaboticabal, Brazil
Laboratório de Dosagens Hormonais, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo—FMVZ/USP, 05508-270 São Paulo, Brazil
Department of Genetics and Reproductive Biotechnologies, Central European Institute of Technology—Veterinary Research Institute, 621-00 Brno, Czech Republic
Author to whom correspondence should be addressed.
Academic Editor: Taras K. Oleksyk
Genes 2021, 12(2), 165;
Received: 31 December 2020 / Revised: 21 January 2021 / Accepted: 23 January 2021 / Published: 26 January 2021
(This article belongs to the Special Issue Genome Diversity of Adaptation and Speciation)
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. View Full-Text
Keywords: cytogenetics; hybrids; post-zygotic barrier; sperm-FISH; Neotropical deer cytogenetics; hybrids; post-zygotic barrier; sperm-FISH; Neotropical deer
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MDPI and ACS Style

Galindo, D.J.; Martins, G.S.; Vozdova, M.; Cernohorska, H.; Kubickova, S.; Bernegossi, A.M.; Kadlcikova, D.; Rubes, J.; Duarte, J.M.B. Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae). Genes 2021, 12, 165.

AMA Style

Galindo DJ, Martins GS, Vozdova M, Cernohorska H, Kubickova S, Bernegossi AM, Kadlcikova D, Rubes J, Duarte JMB. Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae). Genes. 2021; 12(2):165.

Chicago/Turabian Style

Galindo, David Javier, Gabriela Siqueira Martins, Miluse Vozdova, Halina Cernohorska, Svatava Kubickova, Agda Maria Bernegossi, Dita Kadlcikova, Jiri Rubes, and José Maurício Barbanti Duarte. 2021. "Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae)" Genes 12, no. 2: 165.

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