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Chromosomal Mapping and Molecular Characterization of Ribosomal RNA Genes in Lebias fasciata (Teleostei, Cyprinodontidae)

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Abstract

Chromosome location of major (18S, 5.8S and 28S) and 5S ribosomal RNA genes (rDNAs) was examined in Lebias fasciata collected from different Italian blackish-waters, using silver (Ag)- and chromomycin A3 (CMA3)-staining and/or fluorescence in situ hybridization (FISH). Both 18S and 5S rDNA probes for FISH were obtained with polymerase chain reaction-directed cloning from genomic DNA of the examined species. Nucleolar organizer regions (NORs) containing the major rDNAs showed intraspecific polymorphism in number as detected by Ag- and CMA3-staining and FISH with the 18S rDNA probe. On the other hand, 5S rDNA loci constantly occurred on one chromosome pair and co-localized with a pair of the major rDNA loci as evidenced by two-color FISH using the 5S and 18S rDNA probes. Sequential CMA3- and Ag-NOR staining and FISH revealed apparent inactivation of some NORs. The cloned 5S rDNA was found to contain some TATA-like sequences that might play an important role in the regulation of gene expression.

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Authors and Affiliations

  1. Dipartimento di Biologia Animale, Università di Catania, Via Androne 81 –, 95124, Catania

    C. Tigano, V. Ferrito & A. M. Pappalardo

  2. Dipartimento di Scienze della Vita, Seconda Università di Napoli, Via Vivaldi 43 –, 81100, Caserta, Italy

    L. Rocco, L. Rocco, D. Costagliola & V. Stingo

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  1. C. Tigano
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  2. L. Rocco
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  3. V. Ferrito
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  4. D. Costagliola
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  5. A. M. Pappalardo
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  6. V. Stingo
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Correspondence to L. Rocco.

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Tigano, C., Rocco, L., Ferrito, V. et al. Chromosomal Mapping and Molecular Characterization of Ribosomal RNA Genes in Lebias fasciata (Teleostei, Cyprinodontidae). Genetica 121, 95–100 (2004). https://doi.org/10.1023/B:GENE.0000019931.89458.dc

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  • DOI: https://doi.org/10.1023/B:GENE.0000019931.89458.dc

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