The impact of emerging infectious diseases is increasingly recognised as a major threat to wildlife. Wild populations of the endangered Tasmanian devil, , are experiencing devastating losses from a novel transmissible cancer, devil facial tumour disease (DFTD); however, despite the rapid decline of this species, there is currently no information on the presence of haemoprotozoan parasites. In the present study, 95 Tasmanian devil blood samples were collected from four populations in Tasmania, Australia, which underwent molecular screening to detect four major groups of haemoprotozoa: (i) trypanosomes, (ii) piroplasms, (iii) , and (iv) haemosporidia. Sequence results revealed infections in 32/95 individuals. was identified in 10 Tasmanian devils from three sites and a second sp. was identified in 22 individuals that were grouped within the poorly described clade. A single blood sample was positive for sp., which most closely matched . No other blood protozoan parasite DNA was detected. This study provides the first insight into haemoprotozoa from the Tasmanian devil and the first identification of and in this carnivorous marsupial.
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http://dx.doi.org/10.3390/pathogens9110873 | DOI Listing |
Folia Morphol (Warsz)
November 2024
Department of Anatomy, Tokyo Medical University, Tokyo, Japan.
Background: Marsupials have a narrower range of forelimb morphological features than placental mammals. It is hypothesized that this is due to a constraint in the reproductive biology of marsupials. The constraint is that newborn marsupials must crawl into their mother's pouch.
View Article and Find Full Text PDFG3 (Bethesda)
January 2025
Research Group Bioinformatics, Max-Planck-Institute for Evolutionary Biology, August-Thienemann-Str. 2, Plön, Schleswig-Holstein 24306, Germany.
Evolution
December 2024
School of Biological Sciences, Washington State University, Pullman, WA, United States.
Emerging infectious diseases threaten natural populations, and data-driven modeling is critical for predicting population dynamics. Despite the importance of integrating ecology and evolution in models of host-pathogen dynamics, there are few wild populations for which long-term ecological datasets have been coupled with genome-scale data. Tasmanian devil (Sarcophilus harrisii) populations have declined range wide due to devil facial tumor disease (DFTD), a fatal transmissible cancer.
View Article and Find Full Text PDFMol Ecol
November 2024
School of Biological Sciences, Institute of Ecology and Evolution, University of Edinburgh, Edinburgh, UK.
Emerging infectious diseases (EIDs) not only cause catastrophic declines in wildlife populations but also generate selective pressures that may result in rapid evolutionary responses. One such EID is devil facial tumour disease (DFTD) in the Tasmanian devil. DFTD is almost always fatal and has reduced the average lifespan of individuals by around 2 years, likely causing strong selection for traits that reduce susceptibility to the disease, but population decline has also left Tasmanian devils vulnerable to inbreeding depression.
View Article and Find Full Text PDFParasite Immunol
September 2024
Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia.
The major histocompatibility complex (MHC) molecules play an integral role in the adaptive immune response to transmissible cancers through tumour antigen presentation and recognition of allogeneic MHC molecules. The transmissible devil facial tumours 1 and 2 (DFT1 and DFT2) modulate MHC-I antigen presentation to evade host immune responses and facilitate transmission of tumours cells to new Tasmanian devil (Sarcophilus harrisii) hosts. To enhance T-cell-driven tumour immunogenicity for vaccination and immunotherapy, DFT1 and DFT2 cells were co-transfected with (i) NLRC5 for MHC-I expression or CIITA for MHC-I and MHC-II expression, and (ii) a co-stimulatory molecule, either CD80, CD86 or 41BBL.
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