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Analyses of an expressed sequence tag library from Taenia solium, Cysticerca
Jonas Lundström1, Fernando Salazar-Anton, Ellen Sherwood
1Parasitology, Mycology and Water/Environment, Swedish Institute for Infectious Disease Control, Solna, Sweden.
Background:
Neurocysticercosis is a disease caused by the oral ingestion of eggs from the human parasitic worm Taenia solium. Although drugs are available they are controversial because of the side effects and poor efficiency. An expressed sequence tag (EST) library is a method used to describe the gene expression profile and sequence of mRNA from a specific organism and stage. Such information can be used in order to find new targets for the development of drugs and to get a better understanding of the parasite biology.
Methods And Findings:
Here an EST library consisting of 5760 sequences from the pig cysticerca stage has been constructed. In the library 1650 unique sequences were found and of these, 845 sequences (52%) were novel to T. solium and not identified within other EST libraries. Furthermore, 918 sequences (55%) were of unknown function. Amongst the 25 most frequently expressed sequences 6 had no relevant similarity to other sequences found in the Genbank NR DNA database. A prediction of putative signal peptides was also performed and 4 among the 25 were found to be predicted with a signal peptide. Proposed vaccine and diagnostic targets T24, Tsol18/HP6 and Tso31d could also be identified among the 25 most frequently expressed.
Conclusions:
An EST library has been produced from pig cysticerca and analyzed. More than half of the different ESTs sequenced contained a sequence with no suggested function and 845 novel EST sequences have been identified. The library increases the knowledge about what genes are expressed and to what level. It can also be used to study different areas of research such as drug and diagnostic development together with parasite fitness via e.g. immune modulation.
Insights
A new expressed sequence tag (EST) library from the parasite Taenia solium provides novel insights into its gene expression. This resource aids in developing new drugs and diagnostics for neurocysticercosis.
Area of Science:
- Parasitology
- Molecular Biology
- Genomics
Background:
- Neurocysticercosis is a significant human disease caused by the parasitic worm Taenia solium.
- Current treatments for neurocysticercosis face challenges due to side effects and limited efficacy.
- Expressed sequence tag (EST) libraries offer a method to explore gene expression profiles for identifying new therapeutic targets.
Purpose of the Study:
- To construct and analyze an EST library from the pig cysticerca stage of Taenia solium.
- To identify novel genes and understand gene expression patterns within the parasite.
- To provide a resource for the development of new drugs and diagnostic tools for neurocysticercosis.
Main Methods:
- Construction of an EST library comprising 5760 sequences from pig cysticerca.
- Bioinformatic analysis to identify unique, novel, and unknown function sequences.
- Prediction of putative signal peptides within expressed sequences.
- Identification of known vaccine and diagnostic targets within the library.
Main Results:
- The EST library contained 1650 unique sequences, with 845 (52%) being novel to Taenia solium.
- Over half (55%) of the identified sequences had unknown functions.
- Six of the top 25 most expressed sequences showed no significant similarity to existing GenBank entries.
- Four of the top 25 sequences were predicted to have signal peptides, and known targets like Tsol18/HP6 were identified.
Conclusions:
- The developed EST library significantly expands the knowledge of Taenia solium gene expression.
- The identification of numerous novel and uncharacterized sequences offers new avenues for research.
- This resource is valuable for advancing drug discovery, diagnostic development, and understanding parasite biology, including immune modulation strategies.
