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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Developing a Gene Editing System to Study Haplodiploidy in the Jewel Wasp, Nasonia Vitripennis

Muller, Emily A. 01 January 2015 (has links)
Hymenopteran insects, which include all ants, bees and wasps, reproduce through a poorly understood form of reproduction known as haplodiploidy. A promising experimental system for understanding this developmental process is the jewel wasp, Nasonia vitripennis. A critical aspect of using Nasonia as a model is establishing an effective means for editing specific genes of interest so that their functions can be studied through genetic means. For my thesis research, I performed a pilot study of the gene editing method known as CRISPR in Nasonia. I targeted the single heterochromatin protein 1 (HP1) gene present in the Nasonia genome in order to assess the feasibility of this gene editing approach. Targeting HP1 would provide a clear phenotype when this gene is mutated due to its essential functions in early development known from studies in other eukaryotes. Additionally, creating a mutant of this gene will provide a means for studying the role of HP1 in wasp spermatogenesis, an aim that interlinks with the broader chromatin-based goals of our laboratory. Through this study I worked out a streamlined procedure for injecting CRISPR molecules into young wasp embryos, conducting genetic crosses with injected wasps, and screening through their progeny for potential mutants. I observed no mutant phenotypes in injected wasps, but instead, I isolated four potential mutants in F1 progeny. My work has helped to create a solid framework for improving this procedure in Nasonia, and they allow for a better overall understanding of the limitations of producing mutants through CRISPR gene editing in non-model organisms such as Nasonia.

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