*2x PhD studentships in animal immune system origins and evolution* Applications are welcomed for two fully funded, four-year, full-time PhD positions at University College Dublin, Ireland. *PhD Project area*: Reconstructing animal immune system evolution. *PhD supervisor*: Dr Anthony Redmond *Proposed Start Date*: Early 2025 *Location*: School of Medicine, University College Dublin, Ireland *Positions*: 2x 4-year, Full-time PhD studentships (One University College Dublin Ad Astra PhD Studentship and one Royal Society-Research Ireland PhD studentship). *Stipend: * euro 22,000 per annum plus tuition fee waiver. *Summary of Project(s)*: The immune system is a complex evolutionary marvel. Although the system is very well studied in humans, and in some key model organisms, the early formation of the animal immune system is poorly understood. This has been complicated by a combination of issues, including: i) poor availability of high-quality genomes for some of our most distantly related animal relatives, ii) the fast-evolving nature of immune genes rendering homology difficult to identify across large periods of time, and iii) uncertainty in the relationships of the major animal lineages. Fortunately, high-quality genome sequences are now available for representatives of the major animal lineages, while combining wet lab and 'omics' approaches means that genes responding to immune challenges can be more readily identified, providing an unprecedented opportunity to counteract the key issues outlined above. Both studentships will involve collection and maintenance of phylogenetically important marine invertebrates in the lab for use in genome sequencing (where required) and analysis, and immune challenge trials and transcriptomics, to identify the array of immune-associated genes in key lineages. This will reveal both candidate novel immune genes, as well as homologs of known immune genes found in traditional model species. This approach will be paired with phylogenetic investigation of immune genes from across animal diversity to guide reconstruction of the key steps in immune system evolution. The proposed projects are intertwined in approach and share the overarching aim of understanding the origins and evolution of the animal immune system, but diverge in that one studentship will focus on the early evolution of the bilaterian immune system and the other on immune evolution in non-bilaterian animals. These interdisciplinary projects intersect evolutionary genetics, invertebrate zoology, immunology, and bioinformatics. Appropriate training and/or opportunities to gain experience will be provided in skills spanning these areas, including in fieldwork and husbandry of marine invertebrates, wet-lab immune challenges trials, as well as in phylogenetics, bioinformatics and 'omics' techniques. The student will have the opportunity to publish in leading scientific journals and to attend international conferences. *Research Team and Environment*: The successful candidates will join the newly established Redmond lab in University College Dublin's School of Medicine. The group focuses primarily on understanding the evolutionary history of animals, with particular interests in genome evolution, immune systems, and resolving the tree of life, as well as the development of new methodological approaches that this research agenda calls for. Both studentships will benefit from opportunities to contribute to other projects as well as from planned local and international collaborations to ensure the success of this project. *Requirements Qualifications/Expertise*: Applications are sought from inquisitive and dedicated candidates with interest in scientific methodology and discovery. Candidates should have, or expect to soon be awarded, a BSc (grade 2.1 or above), or an MSc in the area of biology (especially: genetics, immunology, zoology or related fields) and/or computer science. *To apply for these positions*: Please send your CV, a cover letter, and the contact details of at least two referees to anthony.redmond@ucd.ie by 30th November 2024. Informal enquiries in relation to the position are welcome and encouraged and should also be sent to this address. Applicants will be considered for both studentships unless otherwise stated in the cover letter. *Relevant publications*: Redmond, A.K., 2024. Acoelomorph flatworm monophyly is a long-branch attraction artefact obscuring a clade of Acoela and Xenoturbellida. *Proceedings of the Royal Society B: Biological **Sciences*, 291 (2031). Matz, H., Taylor, R.S., Redmond, A.K., Hill, T.M., Daniels, R.R., Beltran, M., Henderson, N.C., Macqueen, D.J. and Dooley, H., 2023. Organized B cell sites in cartilaginous fishes reveal the evolutionary foundation of germinal centers. *Cell reports*, 42(7). Redmond, A.K., Pettinello, R., Bakke, F.K. and Dooley, H., 2022. Sharks provide evidence for a highly complex TNFSF repertoire in the jawed vertebrate ancestor. *The Journal of Immunology*, 209(9), pp.1713-1723. Tan, M., Redmond, A.K., Dooley, H., Nozu, R., Sato, K., Kuraku, S., Koren, S., Phillippy, A.M., Dove, A.D. and Read, T., 2021. The whale shark genome reveals patterns of vertebrate gene family evolution. *Elife*, 10, p.e65394. Redmond, A.K. and McLysaght, A., 2021. Evidence for sponges as sister to all other animals from partitioned phylogenomics with mixture models and recoding. *Nature communications*, 12(1), p.1783. Redmond, A.K., Zou, J., Secombes, C.J., Macqueen, D.J. and Dooley, H., 2019. Discovery of all three types in cartilaginous fishes enables phylogenetic resolution of the origins and evolution of interferons. *Frontiers in immunology*, 10, p.467824. Redmond, A.K., Macqueen, D.J. and Dooley, H., 2018. Phylotranscriptomics suggests the jawed vertebrate ancestor could generate diverse helper and regulatory T cell subsets. *BMC **Evolutionary Biology*, 18, pp.1-19. Anthony Redmond (to subscribe/unsubscribe the EvolDir send mail to golding@mcmaster.ca)