title: Variability within the Seychelles cytoplasmic incompatibility system in Drosophila simulans.
abstract: In Drosophila simulans, we described a cytoplasmic incompatibility (CI) system (Seychelles) restricted to insular populations that harbor the mitochondrial type SiI. Since then, these populations have been shown to be heterogeneous, some being infected by one Wolbachia genetic variant only (wHa), while others are infected simultaneously by wHa and by another variant (wNo) always found in association with wHa. We have experimentally obtained two D. simulans strains only infected by the wNo variant. This variant determines its own cytoplasmic incompatibility type. In particular, the cross between wNo-bearing flies and wHa-bearing ones is bidirectionally incompatible. The Seychelles CI type, stricto sensu, is distinguished by being determined by the simultaneous presence of two Wolbachia variants that we found to be mutually incompatible. In addition, we observed incomplete maternal transmission of the Wolbachia.
authors.affiliation: Institut Jacques Monod, laboratoire Dynamique du Génome et Evolution, CNRS-Université Paris, France.
authors.forename: H
authors.initials: H
authors.lastname: Merçot
authors.forename: B
authors.initials: B
authors.lastname: Llorente
authors.forename: M
authors.initials: M
authors.lastname: Jacques
authors.forename: A
authors.initials: A
authors.lastname: Atlan
authors.forename: C
authors.initials: C
authors.lastname: Montchamp-Moreau
mesh_terms: D000818:Animals; D001419:Bacteria / Q000145:classification / Q000235:genetics; D001483:Base Sequence; D003433:Crosses, Genetic; D004330:Drosophila / Q000145:classification / Q000382:microbiology*; D005111:Extrachromosomal Inheritance / Q000235:genetics; D005260:Female; D005298:Fertility / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D012150:Polymorphism, Restriction Fragment Length; D013045:Species Specificity; D013559:Symbiosis