Abstract
Five families are traditionally recognized within higher ruminants (Pecora): Bovidae, Moschidae, Cervidae, Giraffidae and Antilocapridae. The phylogenetic relationships of Antilocapridae and Giraffidae within Pecora are, however, uncertain. While numerous fusions (mostly Robertsonian) have accumulated in the giraffe’s karyotype (Giraffa camelopardalis, Giraffidae, 2n = 30), that of the pronghorn (Antilocapra americana, Antilocapridae, 2n = 58) is very similar to the hypothesised pecoran ancestral state (2n = 58). We examined the chromosomal rearrangements of two species, the giraffe and pronghorn, using a combination of fluorescence in situ hybridization painting probes and BAC clones derived from cattle (Bos taurus, Bovidae). Our data place Moschus (Moschidae) closer to Bovidae than Cervidae. Although the alternative (i.e., Moschidae + Cervidae as sister groups) could not be discounted in recent sequence-based analyses, cytogenetics bolsters conclusions that the former is more likely. Additionally, DNA sequences were isolated from the centromeric regions of both species and compared. Analysis of cenDNA show that unlike the pronghorn, the centromeres of the giraffe are probably organized in a more complex fashion comprising different repetitive sequences specific to single chromosomal pairs or groups of chromosomes. The distribution of nucleolar organiser region (NOR) sites, often an effective phylogenetic marker, were also examined in the two species. In the giraffe, the position of NORs seems to be autapomorphic since similar localizations have not been found in other species within Pecora.
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Abbreviations
- AAM:
-
Antilocapra americana
- BAC:
-
Bacterial artificial chromosome
- BAK:
-
Bovidae ancestral karyotype
- BTA:
-
Bos taurus
- cenDNA:
-
Centromeric DNA
- CDR:
-
Camelus dromedarius
- CHI:
-
Capra hircus
- CR:
-
Centromeric region
- DOP-PCR:
-
Degenerate oligonucleotide primed polymerase chain reaction
- EDA:
-
Elaphurus davidianus
- FISH:
-
Fluorescence in situ hybridization
- GCA:
-
Giraffa camelopardalis
- HSA:
-
Homo sapiens
- LINE:
-
Long interspersed nucleotide elements
- MMO:
-
Moschus moschiferus
- NOR:
-
Nucleolar organiser region
- OJO:
-
Okapia johnstoni
- PAK:
-
Pecoran ancestral karyotype
- pter:
-
Terminus of p arm
- qter:
-
Terminus of q arm
- SINE:
-
Short interspersed nucleotide elements
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Acknowledgements
This work was supported by grants GA CR P506/10/0421, MZE 0002716202 and by the project “CEITEC”- Central European Institute of Technology (ED1.1.00/02.0068) from European regional Development Funds (HC, SK, OK, JR). Research grants of the Russian Fund for Basic Research, programs of the Russian Academy of Science MCB and Integration program of the SB RAS (AIK, PLP, ASG) and the South African National Research Foundation (TJR) are acknowledged. We thank Mitch Bush, David Wildt (Brookfield Zoo, IL, USA) and S. O’Brien for Okapia johnstoni material and A. A. Sharshov for Moschus moschiferus which was collected in the Altai region, Russia.
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Cernohorska, H., Kubickova, S., Kopecna, O. et al. Molecular cytogenetic insights to the phylogenetic affinities of the giraffe (Giraffa camelopardalis) and pronghorn (Antilocapra americana). Chromosome Res 21, 447–460 (2013). https://doi.org/10.1007/s10577-013-9361-0
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DOI: https://doi.org/10.1007/s10577-013-9361-0