Evolutionary implications of infra- and interspecific molecular variability of pathogenesis-related proteins
Braz. j. biol
;
63(3): 437-448, Aug. 2003. ilus, tab
Article
in English
| LILACS
| ID: lil-353966
RESUMO
We have examined phylogenetic relationships in seven pathogenesis-related (PR) protein families. Within-family comparisons involved 79 species, 166 amino acid sequences, and 1,791 sites. For 37 species, 124 different PR isoforms were identified (an average of 3.3 per species). Thirty-one of the 37 species investigated tended to cluster together (84 percent). Of the 17 clusters distinguished in the seven phylogenetic trees, 10 (59 percent) were in agreement with their taxonomic status, ascertained at the family level. The strong similarities among the intraspecific forms, as compared to interspecific differences, argue for some kind of gene conversion, but the rare occurrence of widely different isoforms also suggests diversifying selection. PRs 1, 6, and 4 seem to be less differentiated than PRs 3, 2, 10, and 5.
Full text:
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Index:
LILACS (Americas)
Main subject:
Phylogeny
/
Evolution, Molecular
Type of study:
Etiology study
Language:
English
Journal:
Braz. j. biol
Journal subject:
Biology
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Pontifícia Universidade Católica do Rio Grande do Sul/BR
/
Universidade Federal do Rio Grande do Sul/BR
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