Gregory Simmons

Dr Gregory Simmons serves as a Casual Academic and Honorary Lecturer in the School of Veterinary Science at the University of Queensland. He completed his PhD in 2011 from the School of Veterinary Science, University of Queensland, with a thesis entitled "The Epidemiology and Pathogenesis of Koala Retrovirus." His academic interests focus on retrovirology, particularly the koala retrovirus (KoRV), a gammaretrovirus undergoing active endogenous integration in koala (Phascolarctos cinereus) populations. Simmons investigates KoRV prevalence, which approaches 100% in northern Australian koalas but varies in southern populations, alongside viral loads, proviral copy numbers, genetic subtypes, and transcriptional patterns.

His research elucidates KoRV's contributions to koala morbidity, including lymphoid neoplasia such as lymphoma, immunosuppression facilitating secondary infections like Chlamydia pecorum, and other disorders in genetically bottlenecked populations. Notable studies compare northern Queensland and southern South Australian koalas, revealing higher disease burdens and proviral integrations (140-165 copies per cell) in the north. Simmons has authored or co-authored numerous peer-reviewed publications, including "Differential and defective transcription of koala retrovirus indicates the complexity of host and virus evolution" (Journal of General Virology, 2022), "Transcriptomic and genomic variants between koala populations reveals underlying genetic components to disorders in a bottlenecked population" (Conservation Genetics, 2021), "Koala retrovirus viral load and disease burden in distinct northern and southern koala populations" (Scientific Reports, 2020), "Pathological findings in koala retrovirus-positive koalas from northern and southern Australia" (Journal of Comparative Pathology, 2020), "Genetic diversity of Koala retrovirus env gene subtypes: insights into northern and southern koala populations" (Journal of General Virology, 2019), and "Discovery of a novel retrovirus sequence in an Australian native rodent (Melomys burtoni): a putative link between Gibbon Ape Leukemia Virus and Koala Retrovirus" (PLoS One, 2014). These works, cited over 520 times, advance understanding of KoRV evolution, oncogenesis via human cell models, and ecological impacts, supporting koala conservation. Simmons contributes to teaching, including as a tutor in Companion Animal Clinical Studies (VETS4010), and collaborates internationally on wildlife disease research.

Professional Email: g.simmons@uq.edu.au