Gene discovery for the carcinogenic human liver fluke, Opisthorchis viverrini

Laha, Thewarach, Pinlaor, Porntip, Mulvenna, Jason, Sripa, Banchob, Sripa, Manop, Smout, Michael J., Gasser, Robin B., Brindley, Paul J., and Loukas, Alex (2007) Gene discovery for the carcinogenic human liver fluke, Opisthorchis viverrini. BMC Genomics, 8. 189. pp. 1-15.

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Abstract

Background: Cholangiocarcinoma (CCA) - cancer of the bile ducts - is associated with chronic infection with the liver fluke, Opisthorchis viverrini. Despite being the only eukaryote that is designated as a 'class I carcinogen' by the International Agency for Research on Cancer, little is known about its genome.

Results: Approximately 5,000 randomly selected cDNAs from the adult stage of O. viverrini were characterized and accounted for 1,932 contigs, representing ~14% of the entire transcriptome, and, presently, the largest sequence dataset for any species of liver fluke. Twenty percent of contigs were assigned GO classifications. Abundantly represented protein families included those involved in physiological functions that are essential to parasitism, such as anaerobic respiration, reproduction, detoxification, surface maintenance and feeding. GO assignments were well conserved in relation to other parasitic flukes, however, some categories were over-represented in O. viverrini, such as structural and motor proteins. An assessment of evolutionary relationships showed that O. viverrini was more similar to other parasitic (Clonorchis sinensis and Schistosoma japonicum) than to free-living (Schmidtea mediterranea) flatworms, and 105 sequences had close homologues in both parasitic species but not in S. mediterranea. A total of 164 O. viverrini contigs contained ORFs with signal sequences, many of which were platyhelminth-specific. Examples of convergent evolution between host and parasite secreted/membrane proteins were identified as were homologues of vaccine antigens from other helminths. Finally, ORFs representing secreted proteins with known roles in tumorigenesis were identified, and these might play roles in the pathogenesis of O. viverrini-induced CCA.

Conclusion: This gene discovery effort for O. viverrini should expedite molecular studies of cholangiocarcinogenesis and accelerate research focused on developing new interventions, drugs and vaccines, to control O. viverrini and related flukes.

Item ID: 28480
Item Type: Article (Research - C1)
ISSN: 1471-2164
Additional Information:

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Date Deposited: 10 Sep 2013 02:57
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1108 Medical Microbiology > 110803 Medical Parasitology @ 60%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110311 Medical Genetics (excl Cancer Genetics) @ 20%
06 BIOLOGICAL SCIENCES > 0605 Microbiology > 060503 Microbial Genetics @ 20%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920109 Infectious Diseases @ 100%
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