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Article

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

1
Núcleo de Pesquisa e Conservação de Cervídeos, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista—NUPECCE/FCAV/UNESP, 14884-900 Jaboticabal, Brazil
2
Laboratório de Dosagens Hormonais, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo—FMVZ/USP, 05508-270 São Paulo, Brazil
3
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; https://doi.org/10.3390/genes12020165
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. https://doi.org/10.3390/genes12020165

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. https://doi.org/10.3390/genes12020165

Chicago/Turabian Style

Galindo, David J., Gabriela S. Martins, Miluse Vozdova, Halina Cernohorska, Svatava Kubickova, Agda M. Bernegossi, Dita Kadlcikova, Jiri Rubes, and José M.B. Duarte 2021. "Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae)" Genes 12, no. 2: 165. https://doi.org/10.3390/genes12020165

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