| A new chronotype of Schistosoma mansoni: adaptive significance. | |
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MedLine Citation:
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PMID: 22512397 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Objectives To optimize host-to-host transmission, digenean trematodes (parasites) synchronize their cercarial emission patterns with the aquatic activities of their vertebrate hosts. Schistosoma mansoni has a strictly diurnal shedding pattern involving two circadian chronotypes: an early shedding pattern with a mean peak occurring at 11:00 h and a late pattern with a mean peak occurring at 16:00 h. We analysed the cercarial emergence pattern of three schistosome populations from Oman where S. mansoni is resurgent. Methods For each schistosome population, the cercarial emergence pattern was assessed hourly over several days. Because we identified a new chronotype hitherto unknown in S. mansoni, we undertook taxonomic characterization based on egg morphology and mitochondrial DNA sequence (COX1). Results Taxonomic characterization revealed that the three schistosome populations belong to the species S. mansoni. Hence, this is the first report of this species exhibiting a nocturnal chronotype, with the mean peak occurring at 20:00 h. We interpreted the new chronotype as being the result of a lateral transfer of S. mansoni from humans to Rattus rattus. Conclusion The cercarial emergence pattern of S. mansoni from Oman is circadian, exhibiting either a diurnal or a nocturnal phenotype. |
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Authors:
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Gabriel Mouahid; Mohamed A Idris; Olivier Verneau; André Théron; Mahmoud M A Shaban; Hélène Moné |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-4-19 |
Journal Detail:
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Title: Tropical medicine & international health : TM & IH Volume: - ISSN: 1365-3156 ISO Abbreviation: - Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-4-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9610576 Medline TA: Trop Med Int Health Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2012 Blackwell Publishing Ltd. |
Affiliation:
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University Via Domitia, UMR 5244 CNRS-UPVD, Perpignan, France Sultan Qaboos University, Muscat, Sultanate of Oman University Via Domitia, UMR 5110 CNRS-UPVD, Perpignan, France Ministry of Health, Muscat, Sultanate of Oman. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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