Multilocus Sequence Typing (MLST) and Random Polymorphic DNA (RAPD) Comparisons of Geographic Isolates of Neoparamoeba perurans , the Causative Agent of Amoebic Gill Disease

Neoparamoba perurans, is the aetiological agent of amoebic gill disease (AGD), a disease that affects farmed Atlantic salmon worldwide. Multilocus sequence typing (MLST) and Random Amplified Polymorphic DNA (RAPD) are PCR-based typing methods that allow for the highly reproducible genetic analysis o...

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Bibliographic Details
Published in:Pathogens
Main Authors: Jessica C. Johnson-Mackinnon, Philip B.B. Crosbie, Egil Karlsbakk, Mar Marcos-Lopez, Richard Paley, Barbara F. Nowak, Andrew R. Bridle
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2019
Subjects:
paramoeba perurans
amoebic gill disease
epidemiology
pathogen genetics
Medicine
R
Canada
Norway
Atlantic salmon
Online Access:https://doi.org/10.3390/pathogens8040244
https://doaj.org/article/28705854428240dcbb108da724114290
Description
Summary:Neoparamoba perurans, is the aetiological agent of amoebic gill disease (AGD), a disease that affects farmed Atlantic salmon worldwide. Multilocus sequence typing (MLST) and Random Amplified Polymorphic DNA (RAPD) are PCR-based typing methods that allow for the highly reproducible genetic analysis of population structure within microbial species. To the best of our knowledge, this study represents the first use of these typing methods applied to N. perurans with the objective of distinguishing geographical isolates. These analyses were applied to a total of 16 isolates from Australia, Canada, Ireland, Scotland, Norway, and the USA. All the samples from Australia came from farm sites on the island state of Tasmania. Genetic polymorphism among isolates was more evident from the RAPD analysis compared to the MLST that used conserved housekeeping genes. Both techniques consistently identified that isolates of N. perurans from Tasmania, Australia were more similar to each other than to the isolates from other countries. While genetic differences were identified between geographical isolates, a BURST analysis provided no evidence of a founder genotype. This suggests that emerging outbreaks of AGD are not due to rapid translocation of this important salmonid pathogen from the same area.

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