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Águeda-Pinto A, Castro LFC, Esteves PJ. The evolution of S100A7: an unusual gene expansion in Myotis bats. BMC Evol Biol 2019; 19:102. [PMID: 31088346 PMCID: PMC6518696 DOI: 10.1186/s12862-019-1433-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 05/07/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The S100A7 gene, also called psoriasin, was first described as an upregulated protein in psoriatic skin. For the past years, the importance of this protein as a key effector of innate immunity has been clearly established, not only due to its importance protecting against bacteria skin insult in humans, but also because of its important role in amplifying inflammatory processes. Given the importance of S100A7 in host defense, S100A7 genes have been mostly studied in humans. Here we provide a detailed analysis of the evolution of the gene family encoding for the S100A7 protein in mammals. RESULTS Examination of several mammalian genomes revealed an unexpected variation in the copy number of S100A7. Among the most representative mammalian groups, we report that multiple events of duplication, gene loss and high mutation rates are shaping the evolution of this gene family. An unexpected result comes from Myotis species (order Chiroptera), where we found an outstanding S100A7 gene radiation, resulting in more than 10 copies in M. lucifugus and 5 copies in M. brandtii. These findings suggest a unique adaptive road in these species and are suggestive of special role of this protein in their immune system. CONCLUSIONS We found different evolutionary histories among different mammalian groups. Overall, our results suggest that this gene family is evolving under the birth-and-death model of evolution. To our knowledge, this work represents the first detailed analysis of phylogenetic relationships of S100A7 within mammals and therefore will pave the way to further clarify their unique function in the immune system.
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Affiliation(s)
- Ana Águeda-Pinto
- CIBIO/InBio, Centro de Investigação em Biodiversidade e Recursos genéticos, Universidade do Porto, Rua Padre Armando Quintas, 4485-661 Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre S/N, 4169-007 Porto, Portugal
| | - L. Filipe C. Castro
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre S/N, 4169-007 Porto, Portugal
- CIIMAR/CIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Av. general Norton de Matos S/N, 4450-208 Matosinhos, Portugal
| | - Pedro J. Esteves
- CIBIO/InBio, Centro de Investigação em Biodiversidade e Recursos genéticos, Universidade do Porto, Rua Padre Armando Quintas, 4485-661 Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre S/N, 4169-007 Porto, Portugal
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra 1317, 4585-116 Gandra, Portugal
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Ng JHJ, Tachedjian M, Wang LF, Baker ML. Insights into the ancestral organisation of the mammalian MHC class II region from the genome of the pteropid bat, Pteropus alecto. BMC Genomics 2017; 18:388. [PMID: 28521747 PMCID: PMC5437515 DOI: 10.1186/s12864-017-3760-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 05/03/2017] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Bats are an extremely successful group of mammals and possess a variety of unique characteristics, including their ability to co-exist with a diverse range of pathogens. The major histocompatibility complex (MHC) is the most gene dense and polymorphic region of the genome and MHC class II (MHC-II) molecules play a vital role in the presentation of antigens derived from extracellular pathogens and activation of the adaptive immune response. Characterisation of the MHC-II region of bats is crucial for understanding the evolution of the MHC and of the role of pathogens in shaping the immune system. RESULTS Here we describe the relatively contracted MHC-II region of the Australian black flying-fox (Pteropus alecto), providing the first detailed insight into the MHC-II region of any species of bat. Twelve MHC-II genes, including one locus (DRB2) located outside the class II region, were identified on a single scaffold in the bat genome. The presence of a class II locus outside the MHC-II region is atypical and provides evidence for an ancient class II duplication block. Two non-classical loci, DO and DM and two classical, DQ and DR loci, were identified in P. alecto. A putative classical, DPB pseudogene was also identified. The bat's antigen processing cluster, though contracted, remains highly conserved, thus supporting its importance in antigen presentation and disease resistance. CONCLUSIONS This detailed characterisation of the bat MHC-II region helps to fill a phylogenetic gap in the evolution of the mammalian class II region and is a stepping stone towards better understanding of the immune responses in bats to viral, bacterial, fungal and parasitic infections.
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Affiliation(s)
- Justin H J Ng
- CSIRO Australian Animal Health Laboratory, Health and Biosecurity Business Unit, Geelong, VIC, 3220, Australia
- Faculty of Veterinary Science, University of Sydney, Sydney, NSW, 2006, Australia
- Programme in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore, 169857, Singapore
| | - Mary Tachedjian
- CSIRO Australian Animal Health Laboratory, Health and Biosecurity Business Unit, Geelong, VIC, 3220, Australia
| | - Lin-Fa Wang
- CSIRO Australian Animal Health Laboratory, Health and Biosecurity Business Unit, Geelong, VIC, 3220, Australia
- Programme in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore, 169857, Singapore
| | - Michelle L Baker
- CSIRO Australian Animal Health Laboratory, Health and Biosecurity Business Unit, Geelong, VIC, 3220, Australia.
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Ng JHJ, Tachedjian M, Deakin J, Wynne JW, Cui J, Haring V, Broz I, Chen H, Belov K, Wang LF, Baker ML. Evolution and comparative analysis of the bat MHC-I region. Sci Rep 2016; 6:21256. [PMID: 26876644 PMCID: PMC4753418 DOI: 10.1038/srep21256] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 01/20/2016] [Indexed: 12/22/2022] Open
Abstract
Bats are natural hosts to numerous viruses and have ancient origins, having diverged from other eutherian mammals early in evolution. These characteristics place them in an important position to provide insights into the evolution of the mammalian immune system and antiviral immunity. We describe the first detailed partial map of a bat (Pteropus alecto) MHC-I region with comparative analysis of the MHC-I region and genes. The bat MHC-I region is highly condensed, yet relatively conserved in organisation, and is unusual in that MHC-I genes are present within only one of the three highly conserved class I duplication blocks. We hypothesise that MHC-I genes first originated in the β duplication block, and subsequently duplicated in a step-wise manner across the MHC-I region during mammalian evolution. Furthermore, bat MHC-I genes contain unique insertions within their peptide-binding grooves potentially affecting the peptide repertoire presented to T cells, which may have implications for the ability of bats to control infection without overt disease.
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Affiliation(s)
- Justin H. J. Ng
- CSIRO Health and Biosecurity Business Unit, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
- Faculty of Veterinary Science, University of Sydney, NSW 2006, Australia
- Program in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore 169857
| | - Mary Tachedjian
- CSIRO Health and Biosecurity Business Unit, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
| | - Janine Deakin
- Institute for Applied Ecology, The University of Canberra, ACT 2617, Australia
| | - James W. Wynne
- CSIRO Health and Biosecurity Business Unit, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
| | - Jie Cui
- Program in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore 169857
| | - Volker Haring
- CSIRO, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
| | - Ivano Broz
- CSIRO, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
| | - Honglei Chen
- CSIRO, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
| | - Katherine Belov
- Faculty of Veterinary Science, University of Sydney, NSW 2006, Australia
| | - Lin-Fa Wang
- Program in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore 169857
| | - Michelle L. Baker
- CSIRO Health and Biosecurity Business Unit, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia
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Anthony SJ, Ojeda-Flores R, Rico-Chávez O, Navarrete-Macias I, Zambrana-Torrelio CM, Rostal MK, Epstein JH, Tipps T, Liang E, Sanchez-Leon M, Sotomayor-Bonilla J, Aguirre AA, Ávila-Flores R, Medellín RA, Goldstein T, Suzán G, Daszak P, Lipkin WI. Coronaviruses in bats from Mexico. J Gen Virol 2013; 94:1028-1038. [PMID: 23364191 PMCID: PMC3709589 DOI: 10.1099/vir.0.049759-0] [Citation(s) in RCA: 127] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Bats are reservoirs for a wide range of human pathogens including Nipah, Hendra, rabies, Ebola, Marburg and severe acute respiratory syndrome coronavirus (CoV). The recent implication of a novel beta (β)-CoV as the cause of fatal respiratory disease in the Middle East emphasizes the importance of surveillance for CoVs that have potential to move from bats into the human population. In a screen of 606 bats from 42 different species in Campeche, Chiapas and Mexico City we identified 13 distinct CoVs. Nine were alpha (α)-CoVs; four were β-CoVs. Twelve were novel. Analyses of these viruses in the context of their hosts and ecological habitat indicated that host species is a strong selective driver in CoV evolution, even in allopatric populations separated by significant geographical distance; and that a single species/genus of bat can contain multiple CoVs. A β-CoV with 96.5 % amino acid identity to the β-CoV associated with human disease in the Middle East was found in a Nyctinomops laticaudatus bat, suggesting that efforts to identify the viral reservoir should include surveillance of the bat families Molossidae/Vespertilionidae, or the closely related Nycteridae/Emballonuridae. While it is important to investigate unknown viral diversity in bats, it is also important to remember that the majority of viruses they carry will not pose any clinical risk, and bats should not be stigmatized ubiquitously as significant threats to public health.
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Affiliation(s)
- S J Anthony
- EcoHealth Alliance, 460 West 34th Street, NY, USA
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, 722 West 168th Street, NY, USA
| | - R Ojeda-Flores
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México D.F. Mexico
| | - O Rico-Chávez
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México D.F. Mexico
| | - I Navarrete-Macias
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, 722 West 168th Street, NY, USA
| | | | - M K Rostal
- EcoHealth Alliance, 460 West 34th Street, NY, USA
| | - J H Epstein
- EcoHealth Alliance, 460 West 34th Street, NY, USA
| | - T Tipps
- EcoHealth Alliance, 460 West 34th Street, NY, USA
| | - E Liang
- EcoHealth Alliance, 460 West 34th Street, NY, USA
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, 722 West 168th Street, NY, USA
| | - M Sanchez-Leon
- EcoHealth Alliance, 460 West 34th Street, NY, USA
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, 722 West 168th Street, NY, USA
| | - J Sotomayor-Bonilla
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México D.F. Mexico
| | - A A Aguirre
- George Mason University, 1500 Remount Road, Front Royal, Virginia, USA
| | - R Ávila-Flores
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México D.F. Mexico
| | - R A Medellín
- Instituto de Ecología, Universidad Nacional Autónoma de México, Ap. Postal 70-275, 04510, México, D.F. Mexico
| | - T Goldstein
- One Health Institute, School of Veterinary Medicine, One Shields Ave, University of California Davis, California USA
| | - G Suzán
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México D.F. Mexico
| | - P Daszak
- EcoHealth Alliance, 460 West 34th Street, NY, USA
| | - W I Lipkin
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, 722 West 168th Street, NY, USA
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Abstract
Bats are the second most species rich and abundant group of mammals and display an array of unique characteristics but are also among the most poorly studied mammals. They fill an important ecological niche and have diversified into a wide range of habitats. In recent years, bats have been implicated as reservoirs for some of the most highly pathogenic emerging and re-emerging infectious diseases reported to date, including SARS-like coronavirus, Ebola, Hendra and Nipah viruses. The ability of bats to harbour these viruses in the absence of clinical signs of disease has resulted in a resurgence of interest in bat biology and virus–host interactions. Interest in bats, in Australia in particular, has intensified following the identification of several novel bat-borne viruses from flying-foxes, including Hendra virus, which is capable of spillover from bats to horses and subsequently to humans with potentially fatal consequences. As we continue to encroach on the natural habitats of bats, a better understanding of bat biology, ecology and virus–host interactions has never before been so critical. In this review, we focus on the biology of Australian pteropid bats and the pathogens they harbour, summarising current knowledge of bat-borne diseases, bat ecology, ethology and immunology.
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