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Analysis of transcripts expressed by Eimeria tenella oocysts using subtractive hybridization methods
K B Miska1, R H Fetterer, R C Barfield
1USDA-ARS, Animal Parasitic Diseases Laboratory, 10300 Baltimore Avenue, Building 1042 BARC-East, Beltsville, Maryland 20705, USA. kmiska@anri.barc.usda.gov
The Journal of Parasitology
|February 18, 2005
Summary
This study identified novel genes in Eimeria tenella oocysts using expressed sequence tags (ESTs). Many identified genes were unique, with differential expression observed between sporulated and unsporulated oocyst stages.
Area of Science:
- Parasitology
- Molecular Biology
- Genomics
Background:
- Eimeria tenella is a significant poultry pathogen.
- Understanding gene expression in oocyst stages is crucial for parasite control.
Purpose of the Study:
- To characterize gene expression profiles of Eimeria tenella oocysts.
- To identify novel genes and stage-specific transcripts.
Main Methods:
- Expressed sequence tag (EST) sequencing from complementary DNA (cDNA) of unsporulated and sporulated oocysts.
- Bioinformatic analysis to identify unique sequences and homology.
- Quantitative reverse transcriptase-polymerase chain reaction (RT-qPCR) for validation.
Main Results:
- 499 ESTs were sequenced, yielding 163 unique sequences.
- 64% of unique sequences represent novel genes with no known homology.
- Differential gene expression was confirmed between sporulated and unsporulated oocysts, with distinct transcript profiles.
Conclusions:
- Eimeria tenella oocysts express a significant number of novel genes.
- Distinct transcriptomes exist between sporulated and unsporulated oocyst stages.
- These findings provide insights into parasite development and potential control targets.