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      Comparative analysis based on replication banding reveals the mechanism responsible for the difference in the karyotype constitution of treefrogs Ololygon and Scinax (Arboranae, Hylidae, Scinaxinae)

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          Abstract

          According to the recent taxonomic and phylogenetic revision of the family Hylidae, species of the former Scinax catharinae (Boulenger, 1888) clade were included in the resurrected genus Ololygon Fitzinger, 1843, while species of the Scinax ruber (Laurenti, 1768) clade were mostly included in the genus Scinax Wagler, 1830, and two were allocated to the newly created genus Julianus Duellman et al., 2016. Although all the species of the former Scinax genus shared a diploid number of 2n = 24 and the same fundamental number of chromosome arms of FN = 48, two karyotypic constitutions were unequivocally recognized, related mainly to the distinct size and morphology of the first two chromosome pairs. Some possible mechanisms for these differences had been suggested, but without any experimental evidence. In this paper, a comparison was carried out based on replication chromosome banding, obtained after DNA incorporation of 5-bromodeoxiuridine in chromosomes of Ololygon and Scinax. The obtained results revealed that the loss of repetitive segments in chromosome pairs 1 and 2 was the mechanism responsible for karyotype difference. The distinct localization of the nucleolus organizer regions in the species of both genera also differentiates the two karyotypic constitutions.

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          Most cited references 26

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          Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: a 1-step method

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            Chromosome banding in Amphibia

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              A cladistic analysis of Scinax (Anura: Hylidae)

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                Author and article information

                Journal
                Comparative Cytogenetics
                CCG
                Pensoft Publishers
                1993-078X
                1993-0771
                April 18 2017
                April 18 2017
                : 11
                : 2
                : 267-283
                Article
                10.3897/CompCytogen.v11i2.11254
                © 2017

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