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Deep divergence among subgenera of Gyrodactylus inferred from rDNA ITS region
Zietara, M.S.; Huyse, T.; Lumme, J.; Volckaert, F.A.M.J. (2002). Deep divergence among subgenera of Gyrodactylus inferred from rDNA ITS region. Parasitology 124(1): 39-52. https://dx.doi.org/10.1017/S0031182001008939
In: Parasitology. Cambridge University Press: London. ISSN 0031-1820; e-ISSN 1469-8161
Is gerelateerd aan:
Zietara, M.S.; Huyse, T.; Lumme, J.; Volckaert, F.A.M.J. (2002). Deep divergence among subgenera of Gyrodactylus inferred from rDNA ITS region, in: Huyse, T. Evolutionary associations between Gyrodactylus and its goby host: bound forever? = Evolutionaire relaties tussen Gyrodactylus en zijn grondel gastheer: eeuwig samen?. pp. 15-35, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Acids > Organic compounds > Organic acids > Nucleic acids > RNA
    Anatomical structures > Body organs > Animal organs > Excretory organs
    Belgium
    Biogeny > Phylogeny
    Biological phenomena > Evolution
    Biology > Organism morphology
    France
    Netherlands
    Norway
    Parasites
    Gyrodactylus von Nordmann, 1832 [WoRMS]
    België [Marine Regions]; French Exclusive Economic Zone [Atlantic part] [Marine Regions]; Nederland [Marine Regions]; Norwegian Exclusive Economic Zone [Marine Regions]
    Marien/Kust
Auteurs  Top 
  • Zietara, M.S., correspondent
  • Huyse, T.
  • Lumme, J.
  • Volckaert, F.A.M.J.
Abstract
    This paper adds new insight to a molecular phylogeny of Gyrodactylus, based on a complete sequence of the ITS rDNA region of 4 subgenera and a more detailed molecular analysis. We propose a hierarchical approach in elucidating the phylogeny of this species-rich genus. A total of 37 sequences (915-1239 bp) from 10 representative species from 4 out of 6 subgenera, as defined by Malmberg (1970), are included in the analysis. Genetic differences observed at the 5.8S locus provide objective criteria to separate (sub)genera, while deep genetic differences of the spacers form a sound basis for species-specific identification. We demonstrate that each Gyrodactylus subgenus possesses a unique sequence of the 5.8S gene. Thus, there is concordance between the 5.8S gene and the excretory system used by Malmberg (1970) as a diagnostic character of subgenus status. At the species level, there is a discrepancy between morphological and molecular variation. Whereas the morphological variation, expressed in the shape and size of the attachment apparatus, is very low, the molecular variation, expressed at the ITS1 and ITS2 regions, is very high. This can be attributed either to the fast evolving ITS region or to the fact that the genus consists of groups of a higher taxonomic level than previously recognized. Perspectives and limitations of using the ITS rDNA region for a molecular phylogeny of this genus are discussed.
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