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        Construction of Yeast Artificial Chromosome Libraries From Pathogens and Nonmodel Organisms

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        Many infectious diseases of global impact are caused by parasites. This includes diseases with protozoan etiology, such as malaria, African sleeping sickness, Chagas disease, toxoplasmosis, and amoebiasis, as well as diseases caused by metazoa, such as river blindness, schistosomiasis, ecchinococcosis, and ascariasis. Combined, parasitic diseases affect more than half the world’s human population and are responsible for decreased gross national products and billions of dollars in lost earnings. Although the magnitude of the problem precludes quick solutions, there is reasonable hope that a better understanding of these organisms, especially the host-parasite interactions that underpin virulence and pathogenicity mechanisms, will provide new opportunities for rational intervention strategies. Yeast artificial chromosomes (YAC) have substantially aided in this endeavor by providing an unlimited access to defined parts of a parasite’s genome, which, in turn, has facilitated a broad range of molecular studies. For example, YACs have facilitated positional cloning strategies to identify genes involved in antigenic variation and drug resistance mechanisms. Moreover, YACs have been invaluable tools for the many genome sequencing projects examining parasites. In this chapter, we provide a detailed protocol of how to generate representative YAC libraries from parasite genomes. This protocol can be applied to both protozoa and metazoa, and can even be used for YAC library construction of parasite material isolated from a single infected host.
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