Abstract
Purpose
Tapeworms of Avitellina spp. are among those gastrointestinal parasitic helminths which infect wild and domestic ruminants worldwide leading to various clinical manifestations in the ruminant hosts, thereby causing considerable economic losses in livestock production. While these worms are among the major constraints in ruminant livestock raising, there is very meagre molecular information available making their identity error-prone. This study aimed to provide insights into the genetic characterization of these economically important tapeworms.
Methods
In the present study, we examined 480 guts of slaughtered goats (n = 413) and sheep (n = 67) of which 74 guts were found infected with anoplocephalid cestodes (sheep gut:18; goat gut:56). A total of 27 Avitellina lahorea worms (19 from goat and 8 from sheep) were isolated, fixed, relaxed and stained using Gower’s carmine stain. For molecular analyses, the genomic DNA was extracted and fragments of cytochrome c oxidase subunit 1 (cox1) gene, internal transcribed spacer1-5.8S ribosomal RNA (ITS1-5.8S rRNA) gene, and small subunit ribosomal RNA (18S rRNA) gene were amplified and sequenced.
Results
Based on snail-shaped paruterine organs and other morphological and morphometric features, the worms were identified as Avitellina lahorea. The phylogenetic analyses, based on our original cox1 gene sequence and those available from NCBI GenBank, showed Avitellina tapeworms as a sister lineage of Thysaniezia with 14 to 17% genetic divergence. Molecular analyses of 18S rRNA gene sequences depicted the present isolate as one of the species of the genus Avitellina clustering with A. centripunctata as a separate species in the phylogenetic tree with 92% homogeneity in sequences. In conjunction with existing data of internal transcribed spacer1-5.8S rRNA (ITS1-5.8S rRNA) gene, the phylogenetic analysis placed the present isolate among the anoplocephalids as one of the species.
Conclusion
The present study is the first molecular report on A. lahorea isolated from sheep and goats with the simultaneous use of a morphological approach, and certainly contributes to bridging the existing gaps in the understanding of these economically important parasites.
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Availability of Data and Material
The dataset generated during the present study is available from the corresponding author upon reasonable request.
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Acknowledgements
Authors are thankful to the Department of Zoology, Panjab University, Chandigarh, India where the research work has been performed.
Funding
The present study was supported by financial assistance from the University Grants Commission (UGC), Govt. of India as a fellowship (JRF and SRF) under grant no. F.16–6(DEC.2016)/2017(NET). Recipient: Susheel Kumar.
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Research work, writing the research paper—original draft preparation by Susheel Kumar. The research work was supervised, draft reviewed, and edited by Harpreet Kaur.
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Kumar, S., Kaur, H. Molecular Characterization of Avitellina lahorea Woodland, 1927 (Class Cestoda; Family Anoplocephalidae) Infecting Sheep and Goats Raised in India. Acta Parasit. 68, 359–371 (2023). https://doi.org/10.1007/s11686-023-00671-4
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DOI: https://doi.org/10.1007/s11686-023-00671-4