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Chromosomal study of Khawia abbottinae (Cestoda: Caryophyllidea): karyotype and localization of telomeric and ribosomal sequences after fluorescence in situ hybridization (FISH)

Abstract

An original cytogenetic study combining classical karyotype analysis and modern fluorescence in situ hybridization using telomeric (TTAGGG)n and ribosomal sequences (18S rDNA) was performed in Khawia abbottinae (Cestoda, Caryophyllidea), a parasite of Chinese false gudgeon (Abbottina rivularis) from China. Analyses based on conventional Giemsa staining, DAPI, YOYO-1 dye, and silver (Ag) staining were also carried out. The karyotype is composed of eight pairs of metacentric and telocentric chromosomes (2n = 16, n=5m + 3t). Constitutive heterochromatin was mainly positioned at pericentromeric regions, and telomeric sequences (TTAGGG)n were restricted to the end of all chromosomes. In mitotic preparations stained with Giemsa, both homologues of chromosome pair 4 showed a distinct secondary constriction. FISH with rDNA probe confirmed that this secondary constriction contains a nucleolar organizer region (NOR). The process of spermatocyte meiosis and the dynamics of nucleolus degradation in dividing cell were scrutinized. The present study and its results enhance the limited knowledge on basic karyotype characteristics and 18S rDNA clusters location in caryophyllidean tapeworms.

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Acknowledgments

This work was supported by the Slovak Research and Development Agency under contract No. SK-CN-2017-0007 and Bilateral Mobility Project SAV-18-20 and by the Research & Development Operational Program funded by the ERDF: Environmental protection against parasitozoonoses under the influence of global climate and social changes (code ITMS: 26220220116; rate 0.2).

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Correspondence to Martina Orosová.

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Orosová, M., Provazníková, I., Xi, B.W. et al. Chromosomal study of Khawia abbottinae (Cestoda: Caryophyllidea): karyotype and localization of telomeric and ribosomal sequences after fluorescence in situ hybridization (FISH). Parasitol Res 118, 2789–2800 (2019). https://doi.org/10.1007/s00436-019-06450-3

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Keywords

  • Cestoda
  • Karyotype
  • FISH
  • 18S rDNA mapping
  • Telomeres