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Srisai P, Chaiyadet S, Jumnainsong A, Suttiprapa S, Leelayuwat C, Saichua P. T helper cell responses to Opisthorchis viverrini infection associate with host susceptibility. Parasitol Res 2024; 123:135. [PMID: 38363354 DOI: 10.1007/s00436-024-08154-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/02/2024] [Indexed: 02/17/2024]
Abstract
Opisthorchis viverrini infection is endemic in the lower Mekong subregion. The liver is an organ that worms are drawn to and cause damage. However, the immune-related susceptibility in the liver is poorly understood. In this study, we investigated T helper (Th) cell responses in the liver of BALB/c mice and golden Syrian hamsters during 2-28 days post-infection (DPI). We found that Th cell responses were distinct between mice and hamsters in terms of dynamics and polarization. Mice exhibited the early induction of Th1, Th2, Th17, and regulatory T (Treg) cells responses after the presence of O. viverrini worms at 2 DPI. In hamsters, the late induction of Th1/Th17, downregulation of Th2/Treg responses and early elevation of suppressive cytokine interleukin (IL)-10 were found together with swift reduction of Th cell numbers. Interestingly, expressions of IL-4 (Th2 functional cytokine) and Foxp3 (Treg lineage) were completely different between mice and hamsters which elevated in mice but suppressed in hamsters. These results suggest that early induction and well-regulation are related to host resistance. In contrast, late induction of Th cell response might allow immature worms to develop in the host. Our findings provide a greater understanding in Th cell response-related susceptibility in O. viverrini infection which would be targeting immunity for the development of immune-based intervention such as vaccine.
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Affiliation(s)
- Pattaraporn Srisai
- Department of Tropical Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
- Tropical Disease Research Center, WHO Collaborating Centre for Research and Control of Opisthorchiasis, Khon Kaen University, Khon Kaen, Thailand
| | - Sujittra Chaiyadet
- Department of Tropical Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
- Tropical Disease Research Center, WHO Collaborating Centre for Research and Control of Opisthorchiasis, Khon Kaen University, Khon Kaen, Thailand
| | - Amonrat Jumnainsong
- The Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand
| | - Sutas Suttiprapa
- Department of Tropical Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
- Tropical Disease Research Center, WHO Collaborating Centre for Research and Control of Opisthorchiasis, Khon Kaen University, Khon Kaen, Thailand
| | - Chanvit Leelayuwat
- The Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand
| | - Prasert Saichua
- Department of Tropical Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
- Tropical Disease Research Center, WHO Collaborating Centre for Research and Control of Opisthorchiasis, Khon Kaen University, Khon Kaen, Thailand.
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Saijuntha W, Andrews RH, Sithithaworn P, Petney TN. Opisthorchis viverrini Life Cycle, Distribution, Systematics, and Population Genetics. Recent Results Cancer Res 2023; 219:7-25. [PMID: 37660329 DOI: 10.1007/978-3-031-35166-2_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
Opisthorchis viverrini plays a key role as the carcinogenic liver fluke causing bile duct cancer in Southeast Asia. A comprehensive understanding of its life cycle, distribution, systematics, and population genetics is critically important as they underpin the effective development and establishment of future prevention and control programs that center on opisthorchiasis and cholangiocarcinoma. This chapter provides detailed information concerning the basic biology and updated information of O. viverrini related to its host life cycle, transmission route via raw, partially cooked or fermented freshwater cyprinid fish, endemic areas, and the discovery of new foci. Previous sequential studies over the last two decades on the phylogenetic and systematic relationships, genetic variation, and population genetics of O. viverrini as well as its snail intermediate host Bithynia spp. are presented and discussed, which have led to the currently known complex species level systematics and population genetics framework of this host-parasite system. Additionally, further directions for comprehensive research are suggested to provide a more complete understanding of liver fluke, O. viverrini-related cholangiocarcinoma.
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Affiliation(s)
- Weerachai Saijuntha
- Faculty of Medicine, Mahasarakham University, Maha Sarakham, 44000, Thailand.
| | - Ross H Andrews
- Cholangiocarcinoma Research Institute, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Department of Surgery and Cancer, Faculty of Medicine, Imperial College, London, UK
| | - Paiboon Sithithaworn
- Cholangiocarcinoma Research Institute, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Trevor N Petney
- Departments of Zoology and Paleontology and Evolution, State Museum of Natural History Karlsruhe, Erbprinzenstrasse 13, 76133, Karlsruhe, Germany
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Sotillo J, Pearson MS, Loukas A. Trematode Genomics and Proteomics. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1154:411-436. [PMID: 31297769 DOI: 10.1007/978-3-030-18616-6_13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Trematode infections are among the most neglected tropical diseases despite their worldwide distribution and extraordinary ability to parasitise many different host species and host tissues. Furthermore, these parasites are of great socioeconomic, medical, veterinary and agricultural importance. During the last 10 years, there have been increasing efforts to overcome the lack of information on different "omic" resources such as proteomics and genomics. Herein, we focus on the recent advances in genomics and proteomics from trematodes of human importance, including liver, blood, intestinal and lung flukes. We also provide information on the latest technologies applied to study the biology of trematodes as well as on the resources available for the study of the molecular aspects of this group of helminths.
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Affiliation(s)
- Javier Sotillo
- Centre for Molecular Therapeutics, Australian Institute for Tropical Health and Medicine, James Cook University, Cairns, QLD, Australia.
| | - Mark S Pearson
- Centre for Molecular Therapeutics, Australian Institute for Tropical Health and Medicine, James Cook University, Cairns, QLD, Australia
| | - Alex Loukas
- Centre for Molecular Therapeutics, Australian Institute for Tropical Health and Medicine, James Cook University, Cairns, QLD, Australia
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Clonorchis sinensis and Clonorchiasis: The Relevance of Exploring Genetic Variation. ADVANCES IN PARASITOLOGY 2018; 100:155-208. [PMID: 29753338 DOI: 10.1016/bs.apar.2018.03.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Parasitic trematodes (flukes) cause substantial mortality and morbidity in humans. The Chinese liver fluke, Clonorchis sinensis, is one of the most destructive parasitic worms in humans in China, Vietnam, Korea and the Russian Far East. Although C. sinensis infection can be controlled relatively well using anthelmintics, the worm is carcinogenic, inducing cholangiocarcinoma and causing major suffering in ~15 million people in Asia. This chapter provides an account of C. sinensis and clonorchiasis research-covering aspects of biology, epidemiology, pathogenesis and immunity, diagnosis, treatment and control, genetics and genomics. It also describes progress in the area of molecular biology (genetics, genomics, transcriptomics and proteomics) and highlights challenges associated with comparative genomics and population genetics. It then reviews recent advances in the sequencing and characterisation of the mitochondrial and nuclear genomes for a Korean isolate of C. sinensis and summarises salient comparative genomic work and the implications thereof. The chapter concludes by considering how advances in genomic and informatics will enable research on the genetics of C. sinensis and related parasites, as well as the discovery of new fluke-specific intervention targets.
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Petney TN, Andrews RH, Saijuntha W, Tesana S, Prasopdee S, Kiatsopit N, Sithithaworn P. Taxonomy, Ecology and Population Genetics of Opisthorchis viverrini and Its Intermediate Hosts. ADVANCES IN PARASITOLOGY 2018; 101:1-39. [PMID: 29907251 DOI: 10.1016/bs.apar.2018.05.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
There have been considerable advances in our understanding of the systematics and ecology of Opisthorchis viverrini; however, this new knowledge has not only clarified but also complicated the situation. We now know that what was once considered to be a single species is, in fact, a species complex, with the individual species being confined to specific wetland areas. There is also a strong genetic association between the members of the O. viverrini species complex and their Bithynia snail intermediate hosts. Although this does not negate data collected before the recognition of this situation, it does lead to the caveat that regional and temporal variations in data collected may be related to the species examined. The advances in ecology have generally been spatially limited and have led, in part, to contradictory results that may well be related to nonrecognition of the species studied. It may also be related to natural temporal and spatial variation related, for example, to habitat characteristics. To understand the variation present, it will be necessary to conduct long-term (several years at least) sampling projects after defining the genetic characteristics of O. viverrini sensu lato and its Bithynia snail intermediate hosts.
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Affiliation(s)
- Trevor N Petney
- Cholangiocarcinoma Screening and Care Program (CASCAP), Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Institute of Zoology 1: Ecology and Parasitology, Karlsruhe Institute of Technology, Karlsruhe, Germany; State Museum of Natural History Karlsruhe, Karlsruhe, Germany
| | - Ross H Andrews
- Cholangiocarcinoma Screening and Care Program (CASCAP), Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Weerachai Saijuntha
- Walai Rukhavej Botanical Research Institute, Mahasarakham University, Maha Sarakham, Thailand
| | - Smarn Tesana
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Sattrachai Prasopdee
- Chulabhorn International College of Medicine, Thammasat University, Bangkok, Thailand
| | - Nadda Kiatsopit
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Paiboon Sithithaworn
- Cholangiocarcinoma Screening and Care Program (CASCAP), Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
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Gasser RB, Tan P, Teh BT, Wongkham S, Young ND. Genomics of worms, with an emphasis on Opisthorchis viverrini - opportunities for fundamental discovery and biomedical outcomes. Parasitol Int 2016; 66:341-345. [PMID: 26792076 DOI: 10.1016/j.parint.2016.01.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 01/07/2016] [Accepted: 01/10/2016] [Indexed: 12/24/2022]
Abstract
Neglected tropical diseases cause substantial morbidity and mortality in animals and people globally. Opisthorchiasis is one such disease, caused by the carcinogenic, Asian liver fluke, Opisthorchis viverrini. This hepatobiliary disease is known to be associated with malignant cancer (cholangiocarcinoma, CCA) and affects millions of people in Asia, including Thailand, Lao People's Democratic Republic (PDR) and Cambodia. No vaccine is available, and only one drug (praziquantel) is routinely employed against the parasite. Relatively little is known about the molecular biology of the fluke itself and the disease complex that it causes in humans. With the advent of high-throughput nucleic acid sequencing and bioinformatic technologies, it has now become possible to gain global insights into the molecular biology of parasites. The purpose of this minireview is (i) to discuss recent progress on the genomics of parasitic worms, with an emphasis on the draft genome and transcriptome of O. viverrini; (ii) to use results from an integrated, global analysis of the genomic and transcriptomic data, to explain how we believe that this carcinogenic fluke establishes in the biliary system, how it feeds, survives and protects itself in such a hostile, microaerobic environment within the liver, and to propose how this parasite evades or modulates host attack; and (iii) to indicate some of the challenges, and, more importantly, the exciting opportunities that the 'omic resources for O. viverrini now provide for a plethora of fundamental and applied research areas. Looking ahead, we hope that this genomic resource stimulates vibrant and productive collaborations within a consortium context, focused on the effective control of opisthorchiasis.
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Affiliation(s)
- Robin B Gasser
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Patrick Tan
- Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore; Division of Cancer and Stem Cell Biology, Duke-NUS Graduate Medical School, Singapore 138672, Republic of Singapore
| | - Bin Tean Teh
- Division of Cancer and Stem Cell Biology, Duke-NUS Graduate Medical School, Singapore 138672, Republic of Singapore
| | - Sopit Wongkham
- Faculty of Medicine, Department of Biochemistry, Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Neil D Young
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia.
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Young ND, Nagarajan N, Lin SJ, Korhonen PK, Jex AR, Hall RS, Safavi-Hemami H, Kaewkong W, Bertrand D, Gao S, Seet Q, Wongkham S, Teh BT, Wongkham C, Intapan PM, Maleewong W, Yang X, Hu M, Wang Z, Hofmann A, Sternberg PW, Tan P, Wang J, Gasser RB. The Opisthorchis viverrini genome provides insights into life in the bile duct. Nat Commun 2014; 5:4378. [PMID: 25007141 PMCID: PMC4104445 DOI: 10.1038/ncomms5378] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 06/11/2014] [Indexed: 12/15/2022] Open
Abstract
Opisthorchiasis is a neglected, tropical disease caused by the carcinogenic Asian liver fluke, Opisthorchis viverrini. This hepatobiliary disease is linked to malignant cancer (cholangiocarcinoma, CCA) and affects millions of people in Asia. No vaccine is available, and only one drug (praziquantel) is used against the parasite. Little is known about O. viverrini biology and the diseases that it causes. Here we characterize the draft genome (634.5 Mb) and transcriptomes of O. viverrini, elucidate how this fluke survives in the hostile environment within the bile duct and show that metabolic pathways in the parasite are highly adapted to a lipid-rich diet from bile and/or cholangiocytes. We also provide additional evidence that O. viverrini and other flukes secrete proteins that directly modulate host cell proliferation. Our molecular resources now underpin profound explorations of opisthorchiasis/CCA and the design of new interventions. The Asian liver fluke is a parasitic worm that is linked to an increased risk of malignant cancer. Here, the authors sequence the draft genome and transcriptome of this fluke and provide insight into how the species has adapted to be able to survive in the bile duct.
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Affiliation(s)
- Neil D Young
- 1] Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia [2]
| | - Niranjan Nagarajan
- 1] Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore [2]
| | - Suling Joyce Lin
- Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore
| | - Pasi K Korhonen
- Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Aaron R Jex
- Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Ross S Hall
- Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | | | - Worasak Kaewkong
- Liver Fluke and Cholangiocarcinoma Research Center, Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Denis Bertrand
- Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore
| | - Song Gao
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 138672, Republic of Singapore
| | - Qihui Seet
- Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore
| | - Sopit Wongkham
- Liver Fluke and Cholangiocarcinoma Research Center, Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Bin Tean Teh
- Cancer and Stem Cell Biology, Duke-NUS Graduate Medical School, Singapore 138672, Republic of Singapore
| | - Chaisiri Wongkham
- Liver Fluke and Cholangiocarcinoma Research Center, Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pewpan Maleewong Intapan
- Research and Diagnostic Center for Emerging Infectious Diseases, Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Wanchai Maleewong
- Research and Diagnostic Center for Emerging Infectious Diseases, Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | | | | | | | - Andreas Hofmann
- 1] Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia [2] Structural Chemistry Program, Eskitis Institute, Griffith University, Brisbane, Queensland 4111, Australia
| | - Paul W Sternberg
- Division of Biology, HHMI, California Institute of Technology, Pasadena, California 91125, USA
| | - Patrick Tan
- 1] Genome Institute of Singapore, 60 Biopolis Street, Singapore 138672, Republic of Singapore [2] Cancer and Stem Cell Biology, Duke-NUS Graduate Medical School, Singapore 138672, Republic of Singapore
| | - Jun Wang
- 1] [2] Department of Biology, University of Copenhagen, Copenhagen 2200, Denmark [3] Princess Al Jawhara Center of Excellence in the Research of Hereditary Disorders, King Abdulaziz University, Jeddah 21589, Saudi Arabia [4] Macau University of Science and Technology, Avenida Wai long, Taipa, Macau 999078, China
| | - Robin B Gasser
- Faculty of Veterinary Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
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Sripa B, Brindley PJ, Mulvenna J, Laha T, Smout MJ, Mairiang E, Bethony JM, Loukas A. The tumorigenic liver fluke Opisthorchis viverrini--multiple pathways to cancer. Trends Parasitol 2012; 28:395-407. [PMID: 22947297 DOI: 10.1016/j.pt.2012.07.006] [Citation(s) in RCA: 307] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 07/24/2012] [Accepted: 07/24/2012] [Indexed: 12/12/2022]
Abstract
Liver fluke infection caused by Opisthorchis viverrini is a major public health problem in Thailand and adjacent countries. In addition to infection-associated morbidity, infection with O. viverrini and the related Clonorchis sinensis are unarguable risk factors for cholangiocarcinoma (CAA, bile-duct cancer). Here we review the pathogenesis of opisthorchiasis and the association between O. viverrini infection and bile-duct cancer, focusing on the molecular parallels between wound healing, chronic inflammation, and cancer development. We review a schema for human disease progression from fluke infection, chronic opisthorchiasis, advanced periductal fibrosis, and cholangiocarcinogenesis, and present a rationale for biomarker discovery to facilitate early intervention. We conclude by addressing post-genomic advances with a view to developing new control strategies to combat this infectious cancer.
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Affiliation(s)
- Banchob Sripa
- Department of Pathology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002 Thailand.
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Cantacessi C, Hofmann A, Young ND, Broder U, Hall RS, Loukas A, Gasser RB. Insights into SCP/TAPS proteins of liver flukes based on large-scale bioinformatic analyses of sequence datasets. PLoS One 2012; 7:e31164. [PMID: 22384000 PMCID: PMC3284463 DOI: 10.1371/journal.pone.0031164] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Accepted: 01/03/2012] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND SCP/TAPS proteins of parasitic helminths have been proposed to play key roles in fundamental biological processes linked to the invasion of and establishment in their mammalian host animals, such as the transition from free-living to parasitic stages and the modulation of host immune responses. Despite the evidence that SCP/TAPS proteins of parasitic nematodes are involved in host-parasite interactions, there is a paucity of information on this protein family for parasitic trematodes of socio-economic importance. METHODOLOGY/PRINCIPAL FINDINGS We conducted the first large-scale study of SCP/TAPS proteins of a range of parasitic trematodes of both human and veterinary importance (including the liver flukes Clonorchis sinensis, Opisthorchis viverrini, Fasciola hepatica and F. gigantica as well as the blood flukes Schistosoma mansoni, S. japonicum and S. haematobium). We mined all current transcriptomic and/or genomic sequence datasets from public databases, predicted secondary structures of full-length protein sequences, undertook systematic phylogenetic analyses and investigated the differential transcription of SCP/TAPS genes in O. viverrini and F. hepatica, with an emphasis on those that are up-regulated in the developmental stages infecting the mammalian host. CONCLUSIONS This work, which sheds new light on SCP/TAPS proteins, guides future structural and functional explorations of key SCP/TAPS molecules associated with diseases caused by flatworms. Future fundamental investigations of these molecules in parasites and the integration of structural and functional data could lead to new approaches for the control of parasitic diseases.
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Affiliation(s)
- Cinzia Cantacessi
- Department of Veterinary Science, The University of Melbourne, Parkville, Victoria, Australia
| | - Andreas Hofmann
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Brisbane, Queensland, Australia
| | - Neil D. Young
- Department of Veterinary Science, The University of Melbourne, Parkville, Victoria, Australia
| | - Ursula Broder
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Brisbane, Queensland, Australia
| | - Ross S. Hall
- Department of Veterinary Science, The University of Melbourne, Parkville, Victoria, Australia
| | - Alex Loukas
- Queensland Tropical Health Alliance, James Cook University, Smithfield, Queensland, Australia
| | - Robin B. Gasser
- Department of Veterinary Science, The University of Melbourne, Parkville, Victoria, Australia
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Boonmars T, Boonjaraspinyo S, Kaewsamut B. Animal models for Opisthorchis viverrini infection. Parasitol Res 2008; 104:701-3. [DOI: 10.1007/s00436-008-1268-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Accepted: 11/05/2008] [Indexed: 10/21/2022]
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