Cytogenetic comparison of Podocnemis expansa and Podocnemis unifilis: a case of inversion and duplication involving constitutive heterochromatin
| Autor: | Isabel Souza Cunha, Analía Del Valle Garnero, Ricardo José Gunski, Tiago Marafiga Degrandi, Mario Angel Ledesma |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Genetics
lcsh:QH426-470 biology Secondary constriction Heterochromatin Short Communication Podocnemis expansa Zoology Karyotype Ag-NORs chromosome banding biology.organism_classification karyotype lcsh:Genetics chelonids Constitutive heterochromatin Ploidy Podocnemis unifilis Animal Genetics Molecular Biology Chromosomal inversion |
| Zdroj: | Genetics and Molecular Biology v.36 n.3 2013 Genetics and Molecular Biology Sociedade Brasileira de Genética (SBG) instacron:SBG Genetics and Molecular Biology, Vol 36, Iss 3, Pp 353-356 (2013) Genetics and Molecular Biology, Volume: 36, Issue: 3, Pages: 353-356, Published: 19 JUL 2013 |
| Popis: | Podocnemis expansa and P. unifilis present 2n = 28 chromosomes, a diploid number similar to those observed in other species of the genus. The aim of this study was to characterize these two species using conventional staining and differential CBG-, GTG and Ag-NOR banding. We analyzed specimens of P. expansa and P. unifilis from the state of Tocantins (Brazil), in which we found a 2n = 28 and karyotypes differing in the morphology of the 13(th) pair, which was submetacentric in P. expansa and telocentric in P. unifilis. The CBG-banding patterns revealed a heterochromatic block in the short arm of pair 13 of P. expansa and an interstitial one in pair 13 of P. unifilis, suggesting a pericentric inversion. Pair 14 of P. unifilis showed an insterstitial band in the long arm that was absent in P. expansa, suggesting a duplication in this region. Ag-NORs were observed in the first chromosome pair of both species and was associated to a secondary constriction and heterochromatic blocks. |
| Databáze: | OpenAIRE |
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