Karyotypic characterization of <Emphasis Type="Italic">Trachemys dorbigni</Emphasis> (Testudines: Emydidae) and <Emphasis Type="Italic">Chelonoidis (Geochelone) donosobarrosi</Emphasis> (Testudines: Testudinidae), two species of Cryptodiran turtles from Argentina |
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| Authors: | Pablo A Martinez Juan M Boeris Julieta Sánchez María C Pastori Alejandro D Bolzán Mario A Ledesma |
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| Institution: | 1.Departamento de Genetica e Biologia Molecular,Universidade Federal do Rio Grande do Norte,Natal,Brazil;2.Departamento De Genética, Facultad de Ciencias Exactas, Químicas y Naturales,Universidad Nacional de Misiones,Posadas,Argentina;3.Laboratorio de Citogenética y Mutagénesis,Instituto Multidisciplinario de Biología Celular (IMBICE, CONICET La Plata and CICPBA),La Plata,Argentina;4.CONICET,Buenos Aires,Argentina |
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| Abstract: | We describe for the first time the karyotypes of two species of Cryptodiran turtles from Argentina, namely, Trachemys dorbigni (Emydidae) and Chelonoidis (Geochelone) donosobarrosi (Testudinidae). The karyotype of T. dorbigni (2n = 50) consists of 13 pairs of macrochromosomes and 12 pairs of microchromosomes, whereas the karyotype of C. donosobarrosi (2n = 52) consists of 11 pairs of macrochromosomes and 15 pairs of microchromosomes. Fluorescence in situ hybridization (FISH)
with a (TTAGGG)n telomeric probe showed that the chromosomes of these species have four telomeric signals, two at each end, indicating that
none of the chromosomes of T. dorbigni and C. donosobarrosi are telocentric. The fact that no interstitial telomeric signals were observed after FISH, suggests that interstitial telomeric
sequences did not have a major role in the chromosomal evolution of these species. Additional data will be needed to elucidate
if interstitial telomeric sequences have a major role in the karyotypic evolution of Testudines. |
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