Abstract
Larvae of Drosophila melanogaster produce a haemocytic reaction against eggs of the parasitoid Leptopilina boulardi, which leads to the formation of a multicellular capsule surrounding the foreign object. Melanization resulting from the conversion of phenol to o-quinones frequently accompanies the cellular reaction. Although various cytological and biochemical aspects of this reaction have been investigated, very little is known about genetic determinism of the insect immune response. The heredity of the capacity to encapsulate was analysed by comparing 16 reciprocal crosses made using inbred resistant and susceptible parental strains. We conclude that differences in the encapsulation capacity of D. melanogaster are inherited autosomally, with the reactive phenotype showing complete dominance over the non-reactive one. There were neither sex-linked nor maternal effects. The results of all crosses suggest a single major segregating locus with two alleles and complete dominance of the resistant allele, with cytoplasmic factors and minor modifying genes acting on the major locus.
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Carton, Y., Frey, F. & Nappi, A. Genetic determinism of the cellular immune reaction in Drosophila melanogaster. Heredity 69, 393–399 (1992). https://doi.org/10.1038/hdy.1992.141
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DOI: https://doi.org/10.1038/hdy.1992.141
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