Morphological and molecular characterization of an African freshwater fish trypanosome, including its development in a leech vector

Smit, Nico J., Joubert, Adri, Lawton, Scott P., Hayes, Polly M. and Cook, Courtney A. 2020. Morphological and molecular characterization of an African freshwater fish trypanosome, including its development in a leech vector. International Journal for Parasitology. 50 (10 /11), pp. 921-929. https://doi.org/10.1016/j.ijpara.2020.06.004

TitleMorphological and molecular characterization of an African freshwater fish trypanosome, including its development in a leech vector
TypeJournal article
AuthorsSmit, Nico J., Joubert, Adri, Lawton, Scott P., Hayes, Polly M. and Cook, Courtney A.
AbstractTrypanosomes are ubiquitous blood parasites of fishes and at least 16 species were originally described infecting African freshwater fishes. This number was later reduced to six and in the late 1990s it was proposed that most records of freshwater fish trypanosomes across Africa are Trypanosoma mukasai Hoare, 1932. Recently, results from a molecular analysis of fish trypanosomes from the Okavango Delta, Botswana, reported the presence of at least two genotypic groups and concluded that the identification of T. mukasai remains problematic. The aims of the present study were thus to elucidate the life cycle of a freshwater fish trypanosome from southern Africa and to do a morphological and molecular characterization of this parasite from both the fish host and leech vector. To locate trypanosome stages, leeches were removed from fishes captured in the Phongolo River, South Africa, and fish blood films and leech squashes were Giemsa-stained and screened. To determine whether trypanosome stages in fishes and leeches were of the same genotype, DNA was extracted and fragments of the 18S rDNA gene were amplified and sequenced. Trypanosomes were detected in the fish families Cichlidae, Clariidae, Mochokidae and Schilbeidae. Sequence data showed that the trypanosome from one of the leeches, identified as Batracobdelloides tricarinata (Blanchard, 1897), was highly similar to those obtained from the plain squeaker, Synodontis zambezensis, with 0.7% difference recorded between them. From morphological and molecular data presented here, it is clear that the trypanosomes from Phongolo are closely related to those of the Okavango and should be considered as a single diverse species with genetic differentiation between 0.4-2.9%, under the 3-5% differences expected to be seen between true distinct species within the rRNA. Developmental stages of the trypanosome found in the leech B. tricarinata supports its status as the vector and the molecular evidence shows the relationship between the trypanosome in the fish and leech, but also illustrates the exceptional genetic and morphological diversity of a single species of trypanosome between host species. The work presented here provides us with clear information to take further steps in resolving the taxonomy and systematics of African freshwater fish trypanosomes. [Abstract copyright: Copyright © 2020. Published by Elsevier Ltd.]
Keywords18S rRNA sequences
Fish parasites
Leeches
Trypanosomes
JournalInternational Journal for Parasitology
Journal citation50 (10 /11), pp. 921-929
ISSN1879-0135
0020-7519
Year2020
PublisherElsevier
Accepted author manuscript
License
CC BY-NC-ND 4.0
File Access Level
Open (open metadata and files)
Digital Object Identifier (DOI)https://doi.org/10.1016/j.ijpara.2020.06.004
PubMed ID32687913
Publication dates
Published online17 Jul 2020
Published in printSep 2020

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