title: Use of individual polymorphism to validate potential functional markers: case of a candidate lectin (BgSel) differentially expressed in susceptible and resistant strains of Biomphalaria glabrata.
abstract: BgSel has been identified in Biomphalaria glabrata as a candidate adhesion molecule exhibiting both an Ig-like domain and a carbohydrate recognition domain showing similarities with the l domain of C-type lectins. As susceptibility or resistance of B. glabrata to the trematode Echinostoma caproni correlates with a differential hemocytic adhesive behavior, we investigated the expression of BgSel in snails selected for their susceptibility or resistance. Semi-quantitative RT-PCR analysis of BgSel expression revealed that (i) BgSel expression level was high in susceptible snails and almost undetectable in resistant snails, and that (ii) exposure to the parasite did not affect the expression level of BgSel in either strain. In order to validate this apparent association between low levels of BgSel expression and resistance, we used Real-Time PCR to characterize the relative expression of BgSel in individual snails segregating for susceptibility/resistance. Results established that differential expression of BgSel represents a functional strain marker, but is not a marker of resistance/susceptibility. It is suggested that this correlative approach may be a rapid and efficient alternative to complete functional analyses, and may facilitate the validation of candidate transcripts potentially identified through the numerous differential analyses of animal transcriptomes.
authors.affiliation: Parasitologie fonctionnelle et évolutive, UMR CNRS 5555, 52 Avenue Paul Alduy, Université de Perpignan, 66860 Perpignan Cedex, France.
authors.forename: F
authors.initials: F
authors.lastname: Guillou
authors.forename: G
authors.initials: G
authors.lastname: Mitta
authors.forename: C
authors.initials: C
authors.lastname: Dissous
authors.forename: R
authors.initials: R
authors.lastname: Pierce
authors.forename: C
authors.initials: C
authors.lastname: Coustau
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000235:genetics* / Q000469:parasitology; D004198:Disease Susceptibility; D004449:Echinostoma / Q000472:pathogenicity; D004451:Echinostomiasis / Q000235:genetics; D005786:Gene Expression Regulation; D005819:Genetic Markers; D016133:Polymerase Chain Reaction / Q000379:methods; D011110:Polymorphism, Genetic; D015203:Reproducibility of Results; D019087:Selectins / Q000235:genetics*; D017421:Sequence Analysis
chemical_list: D005819:Genetic Markers; D019087:Selectins; C120002:selectin 1, Biomphalaria glabrata