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Characterization of an atypical antigen from Sarcoptes scabiei containing an MADF domain

Published online by Cambridge University Press:  15 September 2005

E. L. LJUNGGREN ,
K. BERGSTRÖM ,
D. A. MORRISON  and
J. G. MATTSSON
E. L. LJUNGGREN
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
K. BERGSTRÖM
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
D. A. MORRISON
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
J. G. MATTSSON
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
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Abstract

We have cloned a cDNA encoding a novel antigen from a Sarcoptes scabiei (Acari) cDNA library by immunoscreening with sera from S. scabiei-infected dogs. The antigen is encoded by a 2157 bp mRNA with a predicted open reading frame of 719 amino acids (molecular weight 79 kDa). Our sequence analysis identified the presence of a MADF domain in the N-terminus, and downstream of this domain there was a region of low sequence complexity. This latter region contained several blocks of triplets and quadruplets of polar amino acids (Asn, Gln and Ser), and these 3 amino acids represented 39·7% of all amino acids. The antigen was named Atypical Sarcoptes Antigen 1 (ASA1) since the MADF domain normally is found in proteins involved in transcriptional regulation. In addition, 15 out of 62 S. scabiei-infected dogs reacted with a purified recombinant version of ASA1 in Western blot analysis. With immunohistochemistry we could show that ASA1 is expressed throughout the parasite, and that IgG specific for ASA1 binds to the inside wall of the mite's burrow. To our knowledge, this is the first description of an antigen containing an MADF domain.

Keywords

Sarcoptes scabieiscabiesmangegene expressionantigen
Type
Research Article
Information
Parasitology , Volume 132 , Issue 1 , January 2006 , pp. 117 - 126
Copyright
© 2005 Cambridge University Press

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