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Orosová M, Marková A, Zrzavá M, Marec F, Oros M. Chromosome analysis and the occurrence of B chromosomes in fish parasite Acanthocephalus anguillae (Palaeacanthocephala: Echinorhynchida). Parasite 2023; 30:44. [PMID: 37870409 PMCID: PMC10592040 DOI: 10.1051/parasite/2023045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 09/27/2023] [Indexed: 10/24/2023] Open
Abstract
The cytogenetics of Acanthocephala is a neglected area in the study of this group of endoparasites. Chromosome number and/or karyotypes are known for only 12 of the 1,270 described species, and molecular cytogenetic data are limited to rDNA mapping in two species. The standard karyological technique and mapping of 18S rRNA and H3 histone genes on the chromosomes of Acanthocephalus anguillae individuals from three populations, one of which originated from the unfavorable environmental conditions of the Zemplínska Šírava reservoir in eastern Slovakia, were applied for the first time. All specimens had 2n = 7/8 (male/female); n = 1m + 1m-sm + 1a + 1a (X). Fluorescence in situ hybridization (FISH) revealed three loci of 18S rDNA on two autosomes and dispersion of H3 histone genes on all autosomes and the X chromosome. In addition to the standard A chromosome set, 34% of specimens from Zemplínska Šírava possessed a small acrocentric B chromosome, which was always found to be univalent, with no pairing observed between the B chromosome and the A complement. The B chromosome had a small amount of heterochromatin in the centromeric and telomeric regions of the chromosomal arms and showed two clusters of H3 genes. It is well known that an environment permanently polluted with chemicals leads to an increased incidence of chromosomal rearrangements. As a possible scenario for the B chromosome origin, we propose chromosomal breaks due to the mutagenic effect of pollutants in the aquatic environment. The results are discussed in comparison with previous chromosome data from Echinorhynchida species.
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Affiliation(s)
- Martina Orosová
- Institute of Parasitology, Slovak Academy of Sciences Hlinkova 3 040 01 Košice Slovakia
| | - Anna Marková
- Institute of Parasitology, Slovak Academy of Sciences Hlinkova 3 040 01 Košice Slovakia
- Department of Zoology, Faculty of Natural Sciences, Comenius University Ilkovičova 6 842 15 Bratislava Slovakia
| | - Magda Zrzavá
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology Branišovská 31 370 05 České Budějovice Czech Republic
- Faculty of Science, University of South Bohemia Branišovská 1760 370 05 České Budějovice Czech Republic
| | - František Marec
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology Branišovská 31 370 05 České Budějovice Czech Republic
| | - Mikuláš Oros
- Institute of Parasitology, Slovak Academy of Sciences Hlinkova 3 040 01 Košice Slovakia
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Lima JF, Carvalho LS, Carvalho MA, Schneider MC. Chromosome diversity in Buthidae and Chactidae scorpions from Brazilian fauna: Diploid number and distribution of repetitive DNA sequences. Genet Mol Biol 2023; 46:e20220083. [PMID: 37216321 DOI: 10.1590/1678-4685-gmb-2022-0083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 03/23/2023] [Indexed: 05/24/2023] Open
Abstract
In this work, we analyzed cytogenetically eight Chactidae and Buthidae, including the localization of repetitive DNA sequences. The chactids possess monocentric chromosomes and the highest diploid numbers (2n=50 in Brotheas amazonicus, 2n=36 in Chactopsis amazonica, 2n=30 in Neochactas sp.) when compared with buthids (2n=10 in Tityus bahiensis, 2n=14 in Tityus apiacas and Tityus metuendus, 2n=18 in Tityus aba, 2n=26 in Ischnotelson peruassu). The localization of rDNA genes and (TTAGG)n sequences exhibited a conserved pattern of two terminal/subterminal ribosomal cistrons and terminal telomere signals. However, the comparison between the data of C-banding, DAPI after FISH and Cot-DNA fraction indicated a variable quantity and distribution of these regions, as follow: (i) positive heterochromatin and Cot-DNA signals (B. amazonicus and I. peruassu), (ii) small blocks of heterochromatin with large Cot-DNA signals (T. metuendus), (iii) positive heterochromatic regions and absence of Cot-DNA signals (T. aba and T. apiacas), and (iv) negative heterochromatin and Cot-DNA signals (T. bahiensis). Therefore, our results revealed that there still is not a clear relation between quantity of heterochromatin and presence of monocentric or holocentric chromosomes and occurrence of chromosomal rearrangements, indicating that repetitive regions in scorpions must be analyzed using different cytogenetic approaches.
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Affiliation(s)
- Juliana Figueiredo Lima
- Universidade de São Paulo (USP), Instituto de Biociências, Departamento de Zoologia, Programa de Pós-Graduação em Zoologia, São Paulo, SP, Brazil
| | | | - Marcos André Carvalho
- Universidade Federal de Mato Grosso (UFMT), Departamento de Biologia e Zoologia, Cuiabá, MT, Brazil
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New records of trematode and acanthocephalan species in frogs in Erzurum Province, Turkey. Helminthologia 2021; 58:372-384. [PMID: 35095313 PMCID: PMC8776297 DOI: 10.2478/helm-2021-0043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 10/27/2021] [Indexed: 11/20/2022] Open
Abstract
A total of 32 frogs of two species (Rana macrocnemis, Pelophylax ridibundus) that were dissected in some lectures in Ataturk University Science Faculty Biology Department were investigated parasitologically even after the lectures between 2008 and 2014. 9 digenean species (Cephalogonimus retusus [Cephalogonimidae]; Diplodiscus subclavatus [Paramphistomotidae]; Gorgodera cygnoides, Gorgoderina vitelliloba [Gorgoderidae]; Haplometra cylindracea, Haematoloechus variegatus, Opisthioglyphe ranae, Skrjabinoeces similis and Skrjabinoeces breviansa [Plagiorchiidae]), 3 acanthocephalan species (Acanthocephalus ranae, Centrorhynchus sp., Pomphorhynchus laevis) were found. All the parasites are the first record for Erzurum province, Cephalogonimus retusus and Skrjabinoeces similis are the first records of the parasite fauna of Turkey.
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Sochorová J, Gálvez F, Matyášek R, Garcia S, Kovařík A. Analyses of the Updated "Animal rDNA Loci Database" with an Emphasis on Its New Features. Int J Mol Sci 2021; 22:11403. [PMID: 34768834 PMCID: PMC8584138 DOI: 10.3390/ijms222111403] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/17/2021] [Accepted: 10/20/2021] [Indexed: 11/17/2022] Open
Abstract
We report on a major update to the animal rDNA loci database, which now contains cytogenetic information for 45S and 5S rDNA loci in more than 2600 and 1000 species, respectively.The data analyses show the following: (i) A high variability in 5S and 45S loci numbers, with both showing 50-fold or higher variability. However, karyotypes with an extremely high number of loci were rare, and medians generally converged to two 5S sites and two 45S rDNA sites per diploid genome. No relationship was observed between the number of 5S and 45S loci. (ii) The position of 45S rDNA on sex chromosomes was relatively frequent in some groups, particularly in arthropods (14% of karyotypes). Furthermore, 45S rDNA was almost exclusively located in microchromosomes when these were present (in birds and reptiles). (iii) The proportion of active NORs (positively stained with silver staining methods) progressively decreased with an increasing number of 45S rDNA loci, and karyotypes with more than 12 loci showed, on average, less than 40% of active loci. In conclusion, the updated version of the database provides some new insights into the organization of rRNA genes in chromosomes. We expect that its updated content will be useful for taxonomists, comparative cytogeneticists, and evolutionary biologists. .
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Affiliation(s)
- Jana Sochorová
- Institute of Biophysics, Academy of Sciences of the Czech Republic, 61265 Brno, Czech Republic; (J.S.); (R.M.)
| | - Francisco Gálvez
- Bioscripts—Centro de Investigación y Desarrollo de Recursos Científicos, 41012 Sevilla, Spain;
| | - Roman Matyášek
- Institute of Biophysics, Academy of Sciences of the Czech Republic, 61265 Brno, Czech Republic; (J.S.); (R.M.)
| | - Sònia Garcia
- Institut Botànic de Barcelona (IBB-CSIC), Passeig del Migdia s/n, 08038 Barcelona, Spain;
| | - Aleš Kovařík
- Institute of Biophysics, Academy of Sciences of the Czech Republic, 61265 Brno, Czech Republic; (J.S.); (R.M.)
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Vicariance in a generalist fish parasite driven by climate and salinity tolerance of hosts. Parasitology 2020; 147:1658-1664. [PMID: 32907651 DOI: 10.1017/s0031182020001663] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Acanthocephalans are parasites with complex lifecycles that are important components of aquatic systems and are often model species for parasite-mediated host manipulation. Genetic characterization has recently resurrected Pomphorhynchus tereticollis as a distinct species from Pomphorhynchus laevis, with potential implications for fisheries management and host manipulation research. Morphological and molecular examinations of parasites from 7 English rivers across 9 fish species revealed that P. tereticollis was the only Pomphorhynchus parasite present in Britain, rather than P. laevis as previously recorded. Molecular analyses included two non-overlapping regions of the mitochondrial gene - cytochrome oxidase and generated 62 sequences for the shorter fragment (295 bp) and 74 for the larger fragment (583 bp). These were combined with 61 and 13 sequences respectively, from Genbank. A phylogenetic analysis using the two genetic regions and all the DNA sequences available for P. tereticollis identified two distinct genetic lineages in Britain. One lineage, possibly associated with cold water tolerant fish, potentially spread to the northern parts of Britain from the Baltic region via a northern route across the estuarine area of what is now the North Sea during the last Glaciation. The other lineage, associated with temperate freshwater fish, may have arrived later via the Rhine/Thames fluvial connection during the last glaciation or early Holocene when sea levels were low. These results raise important questions on this generalist parasite and its variously environmentally adapted hosts, and especially in relation to the consequences for parasite vicariance.
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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). Parasitol Res 2019; 118:2789-2800. [DOI: 10.1007/s00436-019-06450-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 08/28/2019] [Indexed: 01/27/2023]
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Reier S, Sattmann H, Schwaha T, Harl J, Konecny R, Haring E. An integrative taxonomic approach to reveal the status of the genus Pomphorhynchus Monticelli, 1905 (Acanthocephala: Pomphorhynchidae) in Austria. INTERNATIONAL JOURNAL FOR PARASITOLOGY-PARASITES AND WILDLIFE 2019; 8:145-155. [PMID: 30788212 PMCID: PMC6369135 DOI: 10.1016/j.ijppaw.2019.01.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/29/2019] [Accepted: 01/31/2019] [Indexed: 12/14/2022]
Abstract
Species of the genus Pomphorhynchus Monticelli, 1905 (Acanthocephala: Pomphorhynchidae) are obligate endoparasites infesting mostly freshwater fish. Morphological identification is challenging due to high intraspecific variations. The use of molecular analyses enabled new insights into the diversity and revealed high cryptic presence and unknown distribution patterns for various European species. In Austria only one species, Pomphorhynchus laevis (Müller, 1776), has been reported so far. We conduct an integrative analysis of Pomphorhynchus in Austria with a combination of morphological and molecular methods. Our results revealed the presence of three species of Pomphorhynchus in Austrian waters: Pomphorhynchus laevis, Pomphorhynchus tereticollis (Rudolphi, 1809) and Pomphorhynchus bosniacus Kiskároly and Čanković, 1967. While P. bosniacus was the predominant species in the Danube, P. laevis was recorded exclusively in Styria. Pomphorhynchus tereticollis occurred mainly in rivers of Styria except for one individual found in the Danube. We document the first occurrence of P. bosniacus and P. tereticollis in Austria. We found a high intraspecific haplotype variation in P. bosniacus suggesting that the species has a longer history in Central and Western Europe. It was previously misidentified as P. laevis, which is also true for P. tereticollis. A large number of hosts examined were infected with only juvenile and cystacanth stages suggesting paratenic infections. Our study highlights the importance of using an integrative taxonomic approach in the identification of species of Pomphorhynchus. First evidence of Pomphorhynchus tereticollis and Pomphorhynchus bosniacus in Austria. Pomphorhynchus tereticollis showed a wide host range in comparison to P. bosniacus and P. laevis. Presentation of an integrative taxonomic approach which should prevent misidentifications in future studies.
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Affiliation(s)
- Susanne Reier
- Natural History Museum Vienna, Central Research Laboratories, Burgring 7, 1010, Vienna, Austria
- Department of Integrative Zoology, University of Vienna, Althanstraße 14, 1090, Vienna, Austria
- Corresponding author. Central Research Laboratories, Burgring 7, 1010, Vienna, Austria.
| | - Helmut Sattmann
- Natural History Museum Vienna, 3rd Zoological Department, Burgring 7, 1010, Vienna, Austria
| | - Thomas Schwaha
- Department of Integrative Zoology, University of Vienna, Althanstraße 14, 1090, Vienna, Austria
| | - Josef Harl
- Institute of Pathology and Forensic Veterinary Medicine, University of Veterinary Medicine, Veterinärplatz 1, 1210, Vienna, Austria
| | - Robert Konecny
- Umweltbundesamt, Spittelauer Lände 5, 1090, Vienna, Austria
| | - Elisabeth Haring
- Natural History Museum Vienna, Central Research Laboratories, Burgring 7, 1010, Vienna, Austria
- Department of Integrative Zoology, University of Vienna, Althanstraße 14, 1090, Vienna, Austria
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Mattos VF, Carvalho LS, Cella DM, Schneider MC. Location of 45S Ribosomal Genes in Mitotic and Meiotic Chromosomes of Buthid Scorpions. Zoolog Sci 2016; 31:603-7. [PMID: 25186932 DOI: 10.2108/zs140005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Buthid scorpions exhibit a high variability in diploid number within genera and even within species. Cytogenetically, Buthidae differs from other families of Scorpiones based on its low diploid numbers, holocentric chromosomes, and complex chromosomal chains, which form during meiosis. In this study, we analyzed the distribution of the 45S ribosomal DNA (rDNA) genes in the mitotic and meiotic chromosomes of seven buthid species belonging to the genera Rhopalurus and Tityus with the ultimate goal of elucidating the chromosome organization in these scorpions. The chromosome number ranged from 2n=6 to 2n=28. Despite the high variance in diploid number, all species examined carried their 45S rDNA sites in the terminal region of exactly two chromosomes. Analyses of meiotic cells revealed 45S rDNA clusters in the chromosomal chains of Rhopalurus agamemnon, Tityus bahiensis, Tityus confluens, and Tityus martinpaechi, or in bivalent-like configuration in Rhopalurus rochai, Tityus bahiensis, Tityus confluens, Tityus fasciolatus, and Tityus paraguayensis. In the species examined, the 45S rDNA sites colocalized with constitutive heterochromatin regions. In light of the high chromosome variability and maintenance of number and terminal position of 45S rDNA sites in buthids, the heterochromatin may act to conserve the integrity of the ribosomal genes.
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Affiliation(s)
- Viviane Fagundes Mattos
- 1 Universidade Estadual Paulista, UNESP, Instituto de Biociências, Departamento de Biologia, Avenida 24-A, 1515, Caixa Postal 199, 13506-900, Rio Claro, Sao Paulo, Brazil
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Hernández-Roldán JL, Dapporto L, Dincă V, Vicente JC, Hornett EA, Šíchová J, Lukhtanov VA, Talavera G, Vila R. Integrative analyses unveil speciation linked to host plant shift inSpialiabutterflies. Mol Ecol 2016; 25:4267-84. [DOI: 10.1111/mec.13756] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 06/25/2016] [Accepted: 07/05/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Juan L. Hernández-Roldán
- Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra); Passeig Marítim de la Barceloneta 37 E-08003 Barcelona Spain
- Departamento de Biología (Zoología); Facultad de Ciencias de la Universidad Autónoma de Madrid; C/ Darwin 2 E-28049 Madrid Spain
| | - Leonardo Dapporto
- Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra); Passeig Marítim de la Barceloneta 37 E-08003 Barcelona Spain
- Department of Biology; University of Florence; Via Madonna del Piano 6 50019 Sesto Fiorentino FI Italy
| | - Vlad Dincă
- Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra); Passeig Marítim de la Barceloneta 37 E-08003 Barcelona Spain
- Biodiversity Institute of Ontario; University of Guelph; Guelph Ontario Canada N1G 2W1
| | | | - Emily A. Hornett
- Department of Zoology; University of Cambridge; Cambridge CB2 3EJ UK
| | - Jindra Šíchová
- Institute of Entomology; Biology Centre ASCR; 370 05 České Budějovice Czech Republic
| | - Vladimir A. Lukhtanov
- Department of Karyosystematics; Zoological Institute of Russian Academy of Sciences; Universitetskaya nab. 1 199034 St. Petersburg Russia
- Department of Entomology; St. Petersburg State University; Universitetskaya nab. 7/9 199034 St. Petersburg Russia
| | - Gerard Talavera
- Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra); Passeig Marítim de la Barceloneta 37 E-08003 Barcelona Spain
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology; Harvard University; Cambridge MA 02138 USA
| | - Roger Vila
- Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra); Passeig Marítim de la Barceloneta 37 E-08003 Barcelona Spain
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Bombarová M, Špakulová M, Koubková B. New data on the karyotype and chromosomal rDNA location in Paradiplozoon megan (Monogenea, Diplozoidae), gill parasite of chubs. Parasitol Res 2014; 113:4111-6. [PMID: 25193046 DOI: 10.1007/s00436-014-4082-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 08/11/2014] [Indexed: 11/29/2022]
Abstract
New morphological data on chromosome complement of diplozoid parasite Paradiplozoon megan from the chub Squalius cephalus are shown herein. The karyotype of P. megan is characterized by seven pairs (2n = 14) of medium long (up to 11 μm) one-armed chromosomes which are nearly identical in number and morphological classification with chromosomes of other Paradiplozoon species described karyologically to date (Paradiplozoon bliccae, Paradiplozoon nagibinae, Paradiplozoon sapae, Paradiplozoon pavlovskii and Paradiplozoon homoion). A single locus for ribosomal RNA genes, visualized in the secondary constriction site by the fluorescent in situ hybridization method, is situated interstitially on a median part of a long arm of the smallest, 7th chromosome pair in P. megan. Phylogenetic interrelationships within the members of the family Diplozoidae and hypothesis for the ancestral karyotype are discussed here.
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Affiliation(s)
- Marta Bombarová
- Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovakia,
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Invasive Ponto-Caspian amphipods and fish increase the distribution range of the acanthocephalan Pomphorhynchus tereticollis in the river Rhine. PLoS One 2012; 7:e53218. [PMID: 23300895 PMCID: PMC3534018 DOI: 10.1371/journal.pone.0053218] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Accepted: 11/26/2012] [Indexed: 11/24/2022] Open
Abstract
Non-indigenous species that become invasive are one of the main drivers of biodiversity loss worldwide. In various freshwater systems in Europe, populations of native amphipods and fish are progressively displaced by highly adaptive non-indigenous species that can perform explosive range extensions. A total of 40 Ponto-Caspian round gobies Neogobius melanostomus from the Rhine River near Düsseldorf, North Rhine-Westphalia, Germany, were examined for metazoan parasites and feeding ecology. Three metazoan parasite species were found: two Nematoda and one Acanthocephala. The two Nematoda, Raphidascaris acus and Paracuaria adunca, had a low prevalence of 2.5%. The Acanthocephala, Pomphorhynchus tereticollis, was the predominant parasite species, reaching a level of 90.0% prevalence in the larval stage, correlated with fish size. In addition, four invasive amphipod species, Corophium curvispinum (435 specimens), Dikerogammarus villosus (5,454), Echinogammarus trichiatus (2,695) and Orchestia cavimana (1,448) were trapped at the sampling site. Only D. villosus was infected with P. tereticollis at a prevalence of 0.04%. The invasive goby N. melanostomus mainly preys on these non-indigenous amphipods, and may have replaced native amphipods in the transmission of P. tereticollis into the vertebrate paratenic host. This study gives insight into a potential parasite-host system that consists mainly of invasive species, such as the Ponto-Caspian fish and amphipods in the Rhine. We discuss prospective distribution and migration pathways of non-indigenous vertebrate (round goby) and invertebrates (amphipods) under special consideration of parasite dispersal.
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Classical and molecular cytogenetics of Khawia sinensis (Cestoda: Caryophyllidea), invasive parasite of carp, Cyprinus carpio. Parasitol Res 2011; 110:1937-44. [DOI: 10.1007/s00436-011-2720-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 11/17/2011] [Indexed: 11/26/2022]
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Médoc V, Rigaud T, Motreuil S, Perrot-Minnot MJ, Bollache L. Paratenic hosts as regular transmission route in the acanthocephalan Pomphorhynchus laevis: potential implications for food webs. Naturwissenschaften 2011; 98:825-35. [PMID: 21814810 DOI: 10.1007/s00114-011-0831-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 07/21/2011] [Accepted: 07/22/2011] [Indexed: 11/30/2022]
Abstract
Although trophically transmitted parasites are recognized to strongly influence food-web dynamics through their ability to manipulate host phenotype, our knowledge of their host spectrum is often imperfect. This is particularly true for the facultative paratenic hosts, which receive little interest. We investigated the occurrence and significance both in terms of ecology and evolution of paratenic hosts in the life cycle of the fish acanthocephalan Pomphorhynchus laevis. This freshwater parasite uses amphipods as intermediate hosts and cyprinids and salmonids as definitive hosts. Within a cohort of parasite larvae, usually reported in amphipod intermediate hosts, more than 90% were actually hosted by small-sized fish. We demonstrated experimentally, using one of these fish, that they get infected through the consumption of parasitized amphipods and contribute to the parasite's transmission to a definitive host, hence confirming their paratenic host status. A better knowledge of paratenic host spectrums could help us to understand the fine tuning of transmission strategies, to better estimate parasite biomass, and could improve our perception of parasite subwebs in terms of host-parasite and predator-parasite links.
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A comparative study of karyotypes and chromosomal location of rDNA genes in important liver flukes Fasciola hepatica and Fascioloides magna (Trematoda: Fasciolidae). Parasitol Res 2011; 109:1021-8. [DOI: 10.1007/s00436-011-2339-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 03/08/2011] [Indexed: 12/01/2022]
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Comparative karyological analysis of four diplozoid species (Monogenea, Diplozoidae), gill parasites of cyprinid fishes. Parasitol Res 2010; 108:935-41. [DOI: 10.1007/s00436-010-2135-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Accepted: 10/14/2010] [Indexed: 10/18/2022]
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Ribosomal DNA, tri- and bi-partite pericentromeres in the permanent translocation heterozygote Rhoeo spathacea. Cell Mol Biol Lett 2010; 15:651-64. [PMID: 20865365 PMCID: PMC6275781 DOI: 10.2478/s11658-010-0034-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Accepted: 09/08/2010] [Indexed: 01/29/2023] Open
Abstract
High- and low-stringency FISH and base-specific fluorescence were performed on the permanent translocation heterozygote Rhoeo spathacea (2n = 12). Our results indicate that 45S rDNA arrays, rDNA-related sequences and other GC-rich DNA fraction(s) are located within the pericentromeric regions of all twelve chromosomes, usually colocalizing with the chromomycin A3-positive bands. Homogenization of the pericentromeric regions appears to result from the concerted spread of GC-rich sequences, with differential amplification likely. We found new 5S rDNA patterns, which suggest a variability in the breakpoints and in the consequent chromosome reorganizations. It was found that the large 5S rDNA locus residing on each of the 8E and 9E arms consisted of two smaller loci. On each of the two chromosome arms 3b and 4b, in addition to the major subtelomeric 5S rDNA locus, a new minor locus was found interstitially about 40% along the arm length. The arrangement of cytotogenetic landmarks and chromosome arm measurements are discussed with regard to genome repatterning in Rhoeo.
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Orosová M, Ivica KH, Eva B, Marta Š. Karyotype, chromosomal characteristics of multiple rDNA clusters and intragenomic variability of ribosomal ITS2 in Caryophyllaeides fennica (Cestoda). Parasitol Int 2010; 59:351-7. [DOI: 10.1016/j.parint.2010.04.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 04/27/2010] [Accepted: 04/28/2010] [Indexed: 11/30/2022]
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Orosová M, Marec F, Oros M, Xi BW, Scholz T. A chromosome study and localization of 18S rDNA in Khawia saurogobii (Cestoda: Caryophyllidea). Parasitol Res 2009; 106:587-93. [DOI: 10.1007/s00436-009-1702-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Accepted: 12/03/2009] [Indexed: 10/20/2022]
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Evolutionary dynamics of rDNA clusters on chromosomes of moths and butterflies (Lepidoptera). Genetica 2009; 138:343-354. [PMID: 19921441 DOI: 10.1007/s10709-009-9424-5] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Accepted: 11/03/2009] [Indexed: 01/05/2023]
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Bombarová M, Vítková M, Špakulová M, Koubková B. Telomere analysis of platyhelminths and acanthocephalans by FISH and Southern hybridization. Genome 2009; 52:897-903. [DOI: 10.1139/g09-063] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We examined the composition of telomeres in chromosomes of parasitic worms, representatives of the flatworm groups Monogenea and Cestoda (Platyhelminthes), and thorny-headed worms (Syndermata: Acanthocephala) by fluorescence in situ hybridization (FISH) with different telomeric repeat probes. Our results show that the (TTAGGG)n sequence, supposed to be the ancestral telomeric repeat motif of Metazoa, is conserved in Monogenea ( Paradiplozoon homoion ) and Cestoda ( Caryophyllaeus laticeps , Caryophyllaeides fennica , and Nippotaenia mogurndae ) but not in Acanthocephala ( Pomphorhynchus laevis and Pomphorhynchus tereticollis ). In the Pomphorhynchus species, no hybridization signals were obtained with the “nematode” (TTAGGC)n, “arthropod” (TTAGG)n, and bdelloid (TGTGGG)n telomeric probes using FISH with their chromosomes and Southern hybridization with P. laevis DNA. Therefore, we suggest that parasitic Acanthocephala have evolved yet unknown telomeric repeat motifs or different mechanisms of telomere maintenance.
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Affiliation(s)
- Marta Bombarová
- Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 04001 Košice, Slovakia
- Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Biology Centre of the Academy of Sciences of the Czech Republic (BC ASCR), Institute of Entomology, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Magda Vítková
- Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 04001 Košice, Slovakia
- Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Biology Centre of the Academy of Sciences of the Czech Republic (BC ASCR), Institute of Entomology, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Marta Špakulová
- Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 04001 Košice, Slovakia
- Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Biology Centre of the Academy of Sciences of the Czech Republic (BC ASCR), Institute of Entomology, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Božena Koubková
- Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 04001 Košice, Slovakia
- Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Biology Centre of the Academy of Sciences of the Czech Republic (BC ASCR), Institute of Entomology, Branišovská 31, 370 05 České Budějovice, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
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