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Reduced infectivity in Himasthla elongata (Trematoda, Himasthlidae) cercariae with deviant photoreaction

Published online by Cambridge University Press:  26 February 2020

Anna Solovyeva*
Affiliation:
Laboratory of Non-Coding DNA, Institute of Cytology of Russian Academy of Sciences, Laboratory of parasitic worms and protists, Zoological Institute of Russian Academy of Sciences, St Petersburg, Russia
Kirill Nikolaev
Affiliation:
Laboratory of parasitic worms and protists, Zoological Institute of Russian Academy of Sciences, St.Petersburg, Russia
Egor Lebedev
Affiliation:
School of Natural Sciences, Far Eastern State University, Vladivostok, Russia
Edokiia Potolytsina
Affiliation:
Department of Molecular Medicine, University of Oslo, Oslo, Norway
Nickolay Galaktionov
Affiliation:
Department of Cytology and Histology, St. Petersburg State University, St.Petersburg, Russia
Ivan Levakin
Affiliation:
Laboratory of parasitic worms and protists, Zoological Institute of Russian Academy of Sciences, St. Petersburg, Russia
*
Author for correspondence: A. Solovyeva, E-mail: [email protected]

Abstract

Digenean larvae of hermaphroditic generation – cercariae – are known to be polymorphic at genetic and behavioural levels. Cercariae arise as a result of parthenogenetic reproduction of intramolluscan stages, and represent a clone if a snail was infected with a single miracidium. Here we investigated cercarial clones of Himasthla elongata – namely, the infectivity of cercariae with normal (negative) and deviant (positive) photoreaction. In our study, most H. elongata clones showed intraclonal variance in their response to light. The proportion of photopositive cercariae ranged between 0.2% and 60% in different H. elongata clones. Photopositive larvae demonstrated significantly reduced rates of encystment in Mytilus edulis haemolymph in vitro and in young mussels. We discuss the possible mechanisms behind intraclonal variations, such as non-specific genomic rearrangements.

Type
Short Communication
Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

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