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Differentially expressed parasite genes involved in host recognition and invasion of the triactinomyxon stage of Myxobolus cerebralis (Myxozoa)

Published online by Cambridge University Press:  06 February 2009

E. ESZTERBAUER ,
D. M. KALLERT ,
D. GRABNER  and
M. EL-MATBOULI
E. ESZTERBAUER
Affiliation:
Clinic of Fish and Reptiles, Faculty of Veterinary Medicine, University of Munich, Kaulbachstraße 37, D-80539 Munich, Germany Veterinary Medical Research Institute, Hungarian Academy of Sciences, Hungaria krt. 21, H-1143 Budapest, Hungary
D. M. KALLERT
Affiliation:
Clinic of Fish and Reptiles, Faculty of Veterinary Medicine, University of Munich, Kaulbachstraße 37, D-80539 Munich, Germany
D. GRABNER
Affiliation:
Clinic of Fish and Reptiles, Faculty of Veterinary Medicine, University of Munich, Kaulbachstraße 37, D-80539 Munich, Germany
M. EL-MATBOULI*
Affiliation:
Clinic of Fish and Reptiles, Faculty of Veterinary Medicine, University of Munich, Kaulbachstraße 37, D-80539 Munich, Germany
*
*Corresponding author: Clinic of Fish and Reptiles, Faculty of Veterinary Medicine, University of Munich, Kaulbachstraße 37, D-80539 Munich, Germany. Tel: +49 89 2180 3273. Fax: +49 89 280 5175. E-mail address: el-matbouli@lmu.de
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Summary

The host recognition and invasion process of Myxobolus cerebralis actinospores (triactinomyxon, TAM) was studied on a genetic level. A small-scale in vitro assay was developed to activate a large number of TAMs simultaneously, and to monitor the host invasion in the absence of live fish. The transcriptomes of non-activated and in vitro-activated TAMs were compared by suppressive subtractive hybridization (SSH) to identify parasite genes involved in the host invasion process. Differential screening and a subsequent BLAST search revealed 15 of 452 SSH-library clones expressed differently in activated TAMs. None of the 15 transcripts obtained has previously been identified from M. cerebralis. Quantitative real-time PCR was used to examine the relative expression profile of 8 selected transcripts upon TAM activation and after penetration of the host. Four of these were found to be up-regulated in activated TAMs, while expression was relatively low in non-activated TAMs and in infected fish tissue, indicating that they are relevant genes during host recognition or subsequent host invasion of M. cerebralis TAMs.

Keywords

Myxobolus cerebralis TAMOncorhynchus mykisswhirling diseasesporoplasm releasesuppressive subtractive hybridizationquantitative real-time PCRgene expression
Type
Research Article
Information
Parasitology , Volume 136 , Issue 4 , April 2009 , pp. 367 - 377
Copyright
Copyright © 2009 Cambridge University Press

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