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- W2053275732 abstract "Mikrocytos mackini is an internationally regulated pathogen and causative agent of Denman Island disease in Pacific oysters Crassostrea gigas. Recent phylogenetic breakthroughs have placed this parasite within a highly divergent and globally distributed eukaryotic lineage that has been designated a new taxonomic order, Mikrocytida. The discovery of this new radiation of parasites is accompanied by a heightened awareness of the many knowledge gaps that exist with respect to the general biology, epizootiology, and potential impact of mikrocytid parasites on hosts, ecosystems, and commercial fisheries. It has also highlighted current shortcomings regarding our ability to detect these organisms. In this study, we developed a species-specific, sensitive, and quantitative method for detecting M. mackini DNA from host tissues using probe-based real-time qPCR technology. A limit of sensitivity between 2 and 5 genome copy equivalents was achieved in a reaction matrix containing ≥ 40 ng/μL host gDNA without inhibition. This detection proved superior to existing methods based on conventional PCR, histology or gross pathology and is the first species-specific diagnostic test for M. mackini. Quantitative assessment of parasite DNA using this assay remained accurate to between 10 and 50 copies identifying that during infection, M. mackini DNA was significantly more prevalent in hemolymph, labial palp, and mid-body cross-sections compared to mantle or adductor muscle. DNA extracted from a mid-body cross-section also provided the highest likelihood for detection during diagnostic screening of infected oysters. Taken together, these findings provide strong analytical evidence for the adoption of qPCR as the new reference standard for detecting M. mackini and give preliminary insight into the distribution of the parasite within host tissues. Standardised operating methodologies for sample collection and qPCR testing are provided to aid in the international regulatory diagnosis of M. mackini and serve as a useful platform for the future development of multiplexed or alternate mikrocytid species detection." @default.
- W2053275732 created "2016-06-24" @default.
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- W2053275732 date "2015-03-01" @default.
- W2053275732 modified "2023-10-14" @default.
- W2053275732 title "Molecular detection of Mikrocytos mackini in Pacific oysters using quantitative PCR" @default.
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- W2053275732 doi "https://doi.org/10.1016/j.molbiopara.2015.04.004" @default.
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