Biomphalaria tenagophila: dynamics of populations of resistant and susceptible strains to Schistosoma mansoni, with or without pressure of the parasite
| Autor: | Horácio Antonio Rodrigues, Roberta Lima Caldeira, Ana Lúcia Brunialti Godard, Liana K. Jannotti-Passos, Omar dos Santos Carvalho, Paulo Marcos Zech Coelho, Florence Mara Rosa, Deborah Negrão-Corrêa, Engels Maciel, Horacio M.S Teles |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Microbiology (medical)
resistant and susceptible strains lcsh:Arctic medicine. Tropical medicine lcsh:RC955-962 Population Dynamics Population lcsh:QR1-502 Zoology Snail Breeding Disease Vectors lcsh:Microbiology Host-Parasite Interactions Biomphalaria tenagophila biology.animal parasitic diseases Animals Parasite hosting education Crosses Genetic Genes Dominant education.field_of_study Biomphalaria biology Strain (biology) F1 generation Schistosoma mansoni biology.organism_classification Immunology Reproductive capacity dynamics of populations |
| Zdroj: | Memórias do Instituto Oswaldo Cruz., Vol 101, Pp 247-251 (2006) Memórias do Instituto Oswaldo Cruz, Volume: 101 Supplement 1, Pages: 247-251, Published: OCT 2006 |
| ISSN: | 1678-8060 0074-0276 |
| Popis: | Resistant (Taim, RS) and susceptible albino (Joinville, SC) Biomphalaria tenagophila populations were kept together, at different proportions, throughout a 18-month-period. Some of the snail groups were submitted to Schistosoma mansoni infection. The targets of this study were (a) to analyze the populational dynamics among resistant and susceptible individuals to S. mansoni; (b) to study the resistance phenotype in descendants of cross-breeding; (c) to observe whether the parasite could exert any kind of selection in those snail populations. Throughout the experiment it could be observed that the susceptible B. tenagophila strain (Joinville) underwent a selective pressure of the parasite that was negative, since the individuals showed a high mortality rate. Although B. tenagophila (Taim) population presented a higher mortality rate without pressure of the parasite, this event was compensated by a reproductive capacity. B. tenagophila Taim was more fecund than B. tenagophila Joinville and was able to transmit the resistance character to their descendants. F1 generation obtained by cross-breeding between resistant and susceptible lineages was completely resistant to S. mansoni infection, irrespective of the Taim proportion. Moreover, less than 5% of F2 progeny were susceptible to S. mansoni infection. |
| Databáze: | OpenAIRE |
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