Whole-genome duplications in South American desert rodents (Octodontidae)
- Gallardo Narcisi, Milton Hermes
- Kausel, G.
- Jiménez, A.
- Bacquet, C.
- González, C.
- Figueroa, J.
- Köhler, N.
- Ojeda, Ricardo Alberto
DOIAbstract
The discovery of tetraploidy in the red viscacha rat, Tympanoctomys barrerae (4 n = 102) has emphasized the evolutionary role of genome duplication in mammals. The tetraploid status of this species is corroborated here by in situ PCR and Southern blot analysis of a single-copy gene. The species meiotic configuration strongly suggests a hybrid derivation. To investigate the origin of T. barrerae further, the recently described Pipanacoctomys aureus was studied. This 92-chromosome species also has a duplicated genome size, redundant gene copy number and diploid-like meiotic pairing, consistent with an event of allotetraploidization. Phylogenetic analysis of mitochondrial sequences indicates sister-group relationships between these two tetrapl...
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