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Solovyeva AI, Stefanova VN, Podgornaya OI, et al. Karyotype features of trematode Himasthla elongata. Mol Cytogenet. 2016;9:34doi: 10.1186/s13039-016-0246-8.
Solovyeva, A. I., Stefanova, V. N., Podgornaya, O. I., & Demin, S. I. u. (2016). Karyotype features of trematode Himasthla elongata. Molecular cytogenetics, 934. https://doi.org/10.1186/s13039-016-0246-8
Solovyeva, Anna I, et al. "Karyotype features of trematode Himasthla elongata." Molecular cytogenetics vol. 9 (2016): 34. doi: https://doi.org/10.1186/s13039-016-0246-8
Solovyeva AI, Stefanova VN, Podgornaya OI, Demin SIu. Karyotype features of trematode Himasthla elongata. Mol Cytogenet. 2016 Apr 29;9:34. doi: 10.1186/s13039-016-0246-8. eCollection 2016. PMID: 27134655; PMCID: PMC4850635.
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Mol Cytogenet. 2016 Apr 29;9:34. doi: 10.1186/s13039-016-0246-8. eCollection 2016.

Karyotype features of trematode Himasthla elongata.

Molecular cytogenetics

Anna I Solovyeva, Vera N Stefanova, Olga I Podgornaya, Serghei Iu Demin

Affiliations

  1. Institute of Cytology RAS, St. Petersburg, 194064 Russia.
  2. Institute of Cytology RAS, St. Petersburg, 194064 Russia ; Saint Petersburg State University, St. Petersburg, 199034 Russia ; Far Eastern Federal University, Vladivostok, 690922 Russia.

PMID: 27134655 PMCID: PMC4850635 DOI: 10.1186/s13039-016-0246-8

Abstract

BACKGROUND: Trematodes have a complex life cycle with animal host changes and alternation of parthenogenetic and hermaphrodite generations. The parthenogenetic generation of the worm (rediae) from the first intermediate host Littorina littorea was used for chromosome spreads production. Karyotype description of parasitic flatworm Himasthla elongata Mehlis, 1831 (Digenea: Himasthlidae) based on fluorochrome banding and 18S rDNA mapping.

RESULTS: Chromosome spreads were obtained from cercariae embryos and redial tissue suspensions with high pressure squash method.74.4 % of the analysed spreads contained 12 chromosome pairs (2n = 24). Chromosome classification was performed according to the morphometry and nomenclature published. H. elongata spread chromosomes had a rather bead-like structure. Ideograms of DAPI-banded chromosomes contained 130 individual bands. According to flow cytometry data, the H. elongata genome contains 1.25 pg of DNA, so one band contains, on average, 9.4 Mb of DNA. Image bank captures of individual high-resolution DAPI-banded chromosomes were provided. Differential DAPI- and CMA3-staining revealed the chromatin areas that differed in AT- or GC-content. Both dyes stained chromosomes all along but with varying intensities in different areas. FISH revealed that vast majority (95.0 %) of interphase nuclei contained one signal for 18S rDNA. This corresponded to the number of nucleoli per cell detected by observations in vivo. The rDNA signal was observed on one or two homologs of chromosome 10 in 72.2 % of analysed chromosome spreads, therefore chromosome 10 possessed the main rDNA cluster and minor ones on chromosomes 3 and 6, that corresponds with AgNOR results.

CONCLUSIONS: Himasthla elongata chromosomes variations presented as image bank. Differential chromosome staining with fluorochromes and FISH used for 18S rDNA mapping let us to conclude: (1) Himasthla elongata karyotype is 2n = 24; (2) chromosome number deviates from the previously studied echinostomatids (2n = 14-22); (3). Chromosome 10 possesses the main rDNA cluster with the minor ones existing on chromosomes 3 and 6.

Keywords: 18S rDNA mapping; Digenea; Himasthla elongata; Karyotype

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