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A new chronotype of Schistosoma mansoni: adaptive significance.
MedLine Citation:
PMID:  22512397     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Gabriel Mouahid; Mohamed A Idris; Olivier Verneau; André Théron; Mahmoud M A Shaban; Hélène Moné
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-19
Journal Detail:
Title:  Tropical medicine & international health : TM & IH     Volume:  -     ISSN:  1365-3156     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9610576     Medline TA:  Trop Med Int Health     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
Affiliation:
 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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