1
|
Van Brussel K, Mahar JE, Ortiz-Baez AS, Carrai M, Spielman D, Boardman WSJ, Baker ML, Beatty JA, Geoghegan JL, Barrs VR, Holmes EC. Faecal virome of the Australian grey-headed flying fox from urban/suburban environments contains novel coronaviruses, retroviruses and sapoviruses. Virology 2022; 576:42-51. [PMID: 36150229 DOI: 10.1016/j.virol.2022.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/02/2022] [Accepted: 09/04/2022] [Indexed: 01/04/2023]
Abstract
Bats are important reservoirs for viruses of public health and veterinary concern. Virus studies in Australian bats usually target the families Paramyxoviridae, Coronaviridae and Rhabdoviridae, with little known about their overall virome composition. We used metatranscriptomic sequencing to characterise the faecal virome of grey-headed flying foxes from three colonies in urban/suburban locations from two Australian states. We identified viruses from three mammalian-infecting (Coronaviridae, Caliciviridae, Retroviridae) and one possible mammalian-infecting (Birnaviridae) family. Of particular interest were a novel bat betacoronavirus (subgenus Nobecovirus) and a novel bat sapovirus (Caliciviridae), the first identified in Australian bats, as well as a potentially exogenous retrovirus. The novel betacoronavirus was detected in two sampling locations 1375 km apart and falls in a viral lineage likely with a long association with bats. This study highlights the utility of unbiased sequencing of faecal samples for identifying novel viruses and revealing broad-scale patterns of virus ecology and evolution.
Collapse
Affiliation(s)
- Kate Van Brussel
- Sydney Institute for Infectious Diseases, School of Life & Environmental Sciences and School of Medical Sciences, The University of Sydney, NSW, 2006, Australia
| | - Jackie E Mahar
- Sydney Institute for Infectious Diseases, School of Life & Environmental Sciences and School of Medical Sciences, The University of Sydney, NSW, 2006, Australia
| | - Ayda Susana Ortiz-Baez
- Sydney Institute for Infectious Diseases, School of Life & Environmental Sciences and School of Medical Sciences, The University of Sydney, NSW, 2006, Australia
| | - Maura Carrai
- Jockey Club College of Veterinary Medicine & Life Sciences, City University of Hong Kong, Kowloon Tong, People's Republic of China
| | - Derek Spielman
- School of Veterinary Science, Faculty of Science, University of Sydney, Sydney, NSW, 2006, Australia
| | - Wayne S J Boardman
- School of Animal and Veterinary Sciences, Faculty of Science, Engineering and Technology, University of Adelaide, Adelaide, SA, 5371, Australia
| | - Michelle L Baker
- CSIRO Australian Centre for Disease Preparedness, Health and Biosecurity Business Unit, Geelong, VIC, 3220, Australia
| | - Julia A Beatty
- Jockey Club College of Veterinary Medicine & Life Sciences, City University of Hong Kong, Kowloon Tong, People's Republic of China
| | - Jemma L Geoghegan
- Department of Microbiology and Immunology, University of Otago, Dunedin 9010, New Zealand; Institute of Environmental Science and Research, Wellington, 5022, New Zealand
| | - Vanessa R Barrs
- Jockey Club College of Veterinary Medicine & Life Sciences, City University of Hong Kong, Kowloon Tong, People's Republic of China; Centre for Animal Health and Welfare, City University of Hong Kong, Kowloon Tong, People's Republic of China.
| | - Edward C Holmes
- Sydney Institute for Infectious Diseases, School of Life & Environmental Sciences and School of Medical Sciences, The University of Sydney, NSW, 2006, Australia.
| |
Collapse
|
2
|
Detection and Characterisation of an Endogenous Betaretrovirus in Australian Wild Deer. Viruses 2022; 14:v14020252. [PMID: 35215845 PMCID: PMC8877266 DOI: 10.3390/v14020252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/21/2022] [Accepted: 01/26/2022] [Indexed: 02/01/2023] Open
Abstract
Endogenous retroviruses (ERVs) are the remnants of past retroviral infections that once invaded the host’s germline and were vertically transmitted. ERV sequences have been reported in mammals, but their distribution and diversity in cervids are unclear. Using next-generation sequencing, we identified a nearly complete genome of an endogenous betaretrovirus in fallow deer (Dama dama). Further genomic analysis showed that this provirus, tentatively named cervid endogenous betaretrovirus 1 (CERV β1), has typical betaretroviral genome features (gag-pro-pol-env) and the betaretrovirus-specific dUTPase domain. In addition, CERV β1 pol sequences were detected by PCR in the six non-native deer species with wild populations in Australia. Phylogenetic analyses demonstrated that CERV β1 sequences from subfamily Cervinae clustered as sister taxa to ERV-like sequences in species of subfamily Muntiacinae. These findings, therefore, suggest that CERV β1 endogenisation occurred after the split of these two subfamilies (between 3.3 and 5 million years ago). Our results provide important insights into the evolution of betaretroviruses in cervids.
Collapse
|
3
|
Pro-Inflammatory Signaling Upregulates a Neurotoxic Conotoxin-Like Protein Encrypted Within Human Endogenous Retrovirus-K. Cells 2020; 9:cells9071584. [PMID: 32629888 PMCID: PMC7407490 DOI: 10.3390/cells9071584] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 06/20/2020] [Accepted: 06/25/2020] [Indexed: 02/06/2023] Open
Abstract
Motor neuron degeneration and spinal cord demyelination are hallmark pathological events in Amyotrophic Lateral Sclerosis (ALS). Endogenous retrovirus-K (ERVK) expression has an established association with ALS neuropathology, with murine modeling pointing to a role for the ERVK envelope (env) gene in disease processes. Here, we describe a novel viral protein cryptically encoded within the ERVK env transcript, which resembles two distinct cysteine-rich neurotoxic proteins: conotoxin proteins found in marine snails and the Human Immunodeficiency Virus (HIV) Tat protein. Consistent with Nuclear factor-kappa B (NF-κB)-induced retrotransposon expression, the ERVK conotoxin-like protein (CTXLP) is induced by inflammatory signaling. CTXLP is found in the nucleus, impacting innate immune gene expression and NF-κB p65 activity. Using human autopsy specimens from patients with ALS, we further showcase CTXLP expression in degenerating motor cortex and spinal cord tissues, concomitant with inflammation linked pathways, including enhancement of necroptosis marker mixed lineage kinase domain-like (MLKL) protein and oligodendrocyte maturation/myelination inhibitor Nogo-A. These findings identify CTXLP as a novel ERVK protein product, which may act as an effector in ALS neuropathology.
Collapse
|
4
|
Adachi A. Grand Challenge in Human/Animal Virology: Unseen, Smallest Replicative Entities Shape the Whole Globe. Front Microbiol 2020; 11:431. [PMID: 32256480 PMCID: PMC7093566 DOI: 10.3389/fmicb.2020.00431] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 03/02/2020] [Indexed: 12/20/2022] Open
Affiliation(s)
- Akio Adachi
- Department of Microbiology, Kansai Medical University, Osaka, Japan.,Tokushima University, Tokushima, Japan
| |
Collapse
|