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Drosophila melanogaster  larvae usually react against eggs of the parasitoid wasp  Leptopilina boulardi  by surrounding them with a multicellular melanotic capsule. The genetic determinism of this response has been studied previously using susceptible (non-capsule-forming) and resistant (capsule-forming) strains. The results suggest that differences in their encapsulation response involve a single gene,  resistance to Leptopilina boulardi ( Rlb ), with two alleles, the resistant one being dominant. Rlb  confers specific protection against  Leptopilina boulardi  and is thus probably involved in parasitoid recognition. Recent studies have localized this gene on the right arm of the second chromosome and our aim was to precisely determine its genetic and molecular location. Using strains bearing deletions, we demonstrated that resistance to  Leptopilina boulardi  is conferred by the 55C ;  55F3  region and that the  55E2–E6 ; F3 region is particularly involved. A physical map of the  55C ; 56A  region was then constructed, based on a set of overlapping cosmid and P1 phage clones. Using single and double digests, cross hybridization of restriction fragments, and location of genetically mapped genes and STSs, a complete, five-enzyme restriction map of this 830-kb region was obtained.

Genetic Localization of a Drosophila melanogaster Resistance Gene to a Parasitoid Wasp and Physical Mapping of the Region