Journal
GENES
Volume 12, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/genes12020165
Keywords
cytogenetics; hybrids; post-zygotic barrier; sperm-FISH; Neotropical deer
Categories
Funding
- Sao Paulo Research Foundation (FAPESP) [2010/50748-3, 2017/07014-8, 2019/06940-1]
- Czech Science Foundation (GACR) [20-22517J]
- Ministry of Agriculture of the Czech Republic [RO 0520]
- Ministry of Education, Youth and Sports of the Czech Republic under the project CEITEC 2020 [LQ1601]
- National Fund for Scientific, Technological, and Technological Innovation Development (FONDECYT)
- National Council for Science, Technological, and Technological Innovation Development (CONCYTEC) Peru [116-2017-FONDECYT]
- CNPq/Brazil
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The study evaluated the impact of chromosomal polymorphisms as reproductive barriers within the genus Mazama, showing that inter-specific hybrids between Mazama gouazoubira and Mazama nemorivaga exhibited different degrees of fertility reduction, while intra-specific hybrids of Mazama americana with different cytotypes showed varying pairing rates for Robertsonian translocations and tandem fusions.
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.
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