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Gavin, Lucy (2025) Establishment of Genome Editing in Symbiodinium. MRes thesis, University of Nottingham.

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Abstract

Symbiodinium microadriaticum is a symbiotic algae that is crucial to coral reef ecosystems. It plays a vital role in coral health through its symbiosis with corals, supplying them with nutrients via photosynthesis. However, environmental stressors such as increasing sea temperatures and overexposure to sunlight have led to widespread coral bleaching, threatening reef ecosystems. This project explored the potential of applying CRISPR-Cas9 gene-editing technology to S. microadriaticum. This technique could be a tool for enhancing its resilience to such stressors. The project focused on several key objectives: determining whether D-amino acids, specifically D-alanine, could serve as practical selectable markers, optimising transformation conditions using Lonza electroporation, and inserting foreign genes into the Symbiodinium genome.

CRISPR-Cas9 gene editing targeted the D-amino acid oxidase (DAAO) gene in S. microadriaticum, conferring resistance to D-alanine in transformed cells. D-alanine was confirmed as a practical selectable marker at specific concentrations. Additionally, this study highlighted the challenges of working with Symbiodinium, particularly in achieving consistent transformation efficiency, long-term viability, and overcoming contamination. The work established a proof of concept for the genetic manipulation of S. microadriaticum, opening new avenues for further genetic research in symbiotic dinoflagellates.

This research marks an essential step toward developing genetic engineering techniques that could help mitigate coral bleaching by enhancing Symbiodinium's stress tolerance.

Item Type:	Thesis (University of Nottingham only) (MRes)
Supervisors:	Nisbet, Ellen
Keywords:	Symbiodinium microadriaticum, coral reef, gene editing
Subjects:	Q Science > QH Natural history. Biology > QH 84 Geophysical distribution. Biogeography Q Science > QH Natural history. Biology > QH540 Ecology
Faculties/Schools:	UK Campuses > Faculty of Science > School of Biosciences
Item ID:	80935
Depositing User:	Gavin, Lucy
Date Deposited:	31 Jul 2025 04:40
Last Modified:	31 Jul 2025 04:40
URI:	https://eprints.nottingham.ac.uk/id/eprint/80935

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