1. Genetic variability of the 18 kDa/HP6 protective antigen in Taenia saginata and Taenia asiatica: implications for vaccine development.
- Author
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González LM, Ramiro R, García L, Parkhouse RM, McManus DP, and Gárate T
- Subjects
- Africa, Northern, Amino Acid Sequence, Amino Acid Substitution, Animals, Antigens, Helminth immunology, Antigens, Helminth metabolism, Asia, Cattle, DNA Primers chemistry, DNA, Helminth genetics, DNA, Helminth immunology, Europe, Exons, Fibronectins chemistry, Fibronectins genetics, Genetic Variation immunology, Humans, Latin America, Molecular Sequence Data, Phylogeography, Polymerase Chain Reaction, Protein Structure, Tertiary, Sequence Homology, Nucleic Acid, Swine, Taenia saginata immunology, Taenia saginata isolation & purification, Taenia solium immunology, Taenia solium isolation & purification, Taeniasis genetics, Taeniasis immunology, Taeniasis prevention & control, Vaccines, Synthetic biosynthesis, Antigens, Helminth genetics, Taenia saginata genetics, Taenia solium genetics
- Abstract
Genomic characterization of the genes encoding the Taenia 18 kDa/HP6 protective antigens was carried out for Taenia saginata and T. asiatica using 42 taeniid isolates comprising 23 samples of T. saginata, 13 samples of T. asiatica and 6 samples of T. solium. The corresponding sequences from all taeniid isolates were PCR-amplified with specific primers and then sequenced. All the genes, and other described taeniid gene homologues, had the same genomic structure. Surprisingly, the T. saginata TSA18 gene showed nucleotide variability within the 23 samples analyzed. This resulted in two distinct genotypes with 96% DNA sequence similarity and deduced amino acid sequences with 21 substitutions, mainly located in the second exon which contains the fibronectin type III domain. In regards to T. asiatica, the 18 kDa gene (TASI18) was very similar to the T. saginata antigen homologues, both at the DNA and deduced amino acid sequence levels, and the TSOL18 gene was conserved among T. solium isolates as previously described. The implications of these findings on the future development of taeniid vaccines are discussed., (Copyright © 2011 Elsevier B.V. All rights reserved.)
- Published
- 2011
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