Cite as: Cold Spring Harb. Protoc.; 2009; doi:10.1101/pdb.emo134

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emoEmerging Model Organisms

The Parasitoid Wasp Nasonia: An Emerging Model System with Haploid Male Genetics

John H. Werren1 and David W. Loehlin

Department of Biology, University of Rochester, Rochester, NY 14627, USA

1Corresponding author (werr{at}mail.rochester.edu).


INTRODUCTION

Nasonia is a complex of four closely related species of wasps that is rapidly emerging as a model for evolutionary and developmental genetics. It has several features that make it an excellent genetic system, including a short generation time, ease of rearing, interfertile species, visible and molecular markers, and a sequenced genome. The form of sex determination, called "haplodiploidy," makes Nasonia particularly suitable as a genetic tool. Females are diploid and develop from fertilized eggs, whereas males are haploid and develop from unfertilized eggs. This allows geneticists to exploit many of the advantages of haploid genetics in an otherwise complex eukaryotic organism. Nasonia readily inbreeds, permitting production of isogenic lines, and the four species in the genus are interfertile (after removal of the endosymbiont Wolbachia), facilitating movement of genes between the species for efficient positional cloning of quantitative trait loci (QTL). Genome sequencing of the genetic model Nasonia vitripennis and two interfertile species, Nasonia giraulti and Nasonia longicornis, is now completed. This genome project provides a wealth of interspecies polymorphisms (e.g., single nucleotide polymorphisms [SNPs], insertion-deletions [indels], microsatellites) to facilitate positional cloning of genes involved in species differences in behavior, morphology, and development. Advances in the genetics of this system also open a path for improvement of parasitoid insects as agents of pest control.


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