4.3 Article

Some secrets are revealed: parasitic keratitis amoebae as vectors of the scarcely described pandoraviruses to humans

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PARASITOLOGY RESEARCH
卷 113, 期 10, 页码 3759-3764

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SPRINGER
DOI: 10.1007/s00436-014-4041-3

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Pandoravirus; First detection; First association to humans; Endocytobiont; Free-living amoeba; Acanthamoeba; Acanthamoeba-keratitis

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In this article, the results of a long effort to derive valuable phylogenetic data about an extraordinary spore-like infectious particle (endocytobiont) within host amoebae (Acanthamoeba sp.) recently isolated from the contact lens and the inflamed eye of a patient with keratitis are presented. The development of these endocytobionts has already been demonstrated with electron microscopic photo sequences, leading to a relevant model of its development presented here. The molecular biological investigation following the discovery of two other Pandoravirus species within aquatic sediments in 2013 led to the taxonomic affiliation of our endocytobiont with the genus Pandoravirus. A range of endocytobionts (intracellular biofilms) have been found in recent years, among which are several viruses which obligatorily proliferate within free-living amoebae. In human medicine, foreign objects which are placed in or on humans cause problems with microorganisms in biofilms. Contact lenses are especially important, because they are known as a source of a rapid formation of biofilm. These were the first Pandoraviruses described, and because this is additionally the first documented association with humans, we have clearly demonstrated how easily such (viral) endocytobionts can be transferred to humans. This case counts as an example of parasites acting as vectors of phylogenetically different microorganisms especially when living sympatric within their biocoenosis of biofilms. As the third part of the Pandoravirus trilogy, it finally reveals the phylogenetic nature of these extraordinary endocytobionts within Acanthamoebae.

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