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Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines
The extent of sequence diversity among the genes encoding 10 antigens (Tp1–10) known to be recognized by CD8(+) T lymphocytes from cattle immune to Theileria parva was analysed. The sequences were derived from parasites in 23 buffalo-derived cell lines, three cattle-derived isolates and one cloned c...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Cambridge University Press
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6126638/ https://www.ncbi.nlm.nih.gov/pubmed/29729680 http://dx.doi.org/10.1017/S0031182018000264 |
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author | Sitt, Tatjana Pelle, Roger Chepkwony, Maurine Morrison, W. Ivan Toye, Philip |
author_facet | Sitt, Tatjana Pelle, Roger Chepkwony, Maurine Morrison, W. Ivan Toye, Philip |
author_sort | Sitt, Tatjana |
collection | PubMed |
description | The extent of sequence diversity among the genes encoding 10 antigens (Tp1–10) known to be recognized by CD8(+) T lymphocytes from cattle immune to Theileria parva was analysed. The sequences were derived from parasites in 23 buffalo-derived cell lines, three cattle-derived isolates and one cloned cell line obtained from a buffalo-derived stabilate. The results revealed substantial variation among the antigens through sequence diversity. The greatest nucleotide and amino acid diversity were observed in Tp1, Tp2 and Tp9. Tp5 and Tp7 showed the least amount of allelic diversity, and Tp5, Tp6 and Tp7 had the lowest levels of protein diversity. Tp6 was the most conserved protein; only a single non-synonymous substitution was found in all obtained sequences. The ratio of non-synonymous: synonymous substitutions varied from 0.84 (Tp1) to 0.04 (Tp6). Apart from Tp2 and Tp9, we observed no variation in the other defined CD8+ T cell epitopes (Tp4, 5, 7 and 8), indicating that epitope variation is not a universal feature of T. parva antigens. In addition to providing markers that can be used to examine the diversity in T. parva populations, the results highlight the potential for using conserved antigens to develop vaccines that provide broad protection against T. parva. |
format | Online Article Text |
id | pubmed-6126638 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Cambridge University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-61266382018-09-17 Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines Sitt, Tatjana Pelle, Roger Chepkwony, Maurine Morrison, W. Ivan Toye, Philip Parasitology Research Article The extent of sequence diversity among the genes encoding 10 antigens (Tp1–10) known to be recognized by CD8(+) T lymphocytes from cattle immune to Theileria parva was analysed. The sequences were derived from parasites in 23 buffalo-derived cell lines, three cattle-derived isolates and one cloned cell line obtained from a buffalo-derived stabilate. The results revealed substantial variation among the antigens through sequence diversity. The greatest nucleotide and amino acid diversity were observed in Tp1, Tp2 and Tp9. Tp5 and Tp7 showed the least amount of allelic diversity, and Tp5, Tp6 and Tp7 had the lowest levels of protein diversity. Tp6 was the most conserved protein; only a single non-synonymous substitution was found in all obtained sequences. The ratio of non-synonymous: synonymous substitutions varied from 0.84 (Tp1) to 0.04 (Tp6). Apart from Tp2 and Tp9, we observed no variation in the other defined CD8+ T cell epitopes (Tp4, 5, 7 and 8), indicating that epitope variation is not a universal feature of T. parva antigens. In addition to providing markers that can be used to examine the diversity in T. parva populations, the results highlight the potential for using conserved antigens to develop vaccines that provide broad protection against T. parva. Cambridge University Press 2018-09 2018-05-06 /pmc/articles/PMC6126638/ /pubmed/29729680 http://dx.doi.org/10.1017/S0031182018000264 Text en © Cambridge University Press 2018 http://creativecommons.org/licenses/by/4.0/ This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Sitt, Tatjana Pelle, Roger Chepkwony, Maurine Morrison, W. Ivan Toye, Philip Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title | Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title_full | Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title_fullStr | Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title_full_unstemmed | Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title_short | Theileria parva antigens recognized by CD8+ T cells show varying degrees of diversity in buffalo-derived infected cell lines |
title_sort | theileria parva antigens recognized by cd8+ t cells show varying degrees of diversity in buffalo-derived infected cell lines |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6126638/ https://www.ncbi.nlm.nih.gov/pubmed/29729680 http://dx.doi.org/10.1017/S0031182018000264 |
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