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So far, investigation of MOMP variability has been focused mainly on molecular epidemiological surveys. In contrast, we aimed to evaluate the impact of the host pressure on this key antigen by analyzing its evolutionary dynamics in 795 isolates from urogenital infections, taking into account the MOMP secondary structure and the sizes\/positions of antigenic regions. One-third of the specimens showed a mutational drift from the corresponding genotype, where \u223c42% of the mutations had never been described. Amino acid alterations were sixfold more frequent within B-cell epitopes than in the remaining protein (<jats:italic>P<\/jats:italic>= 0.027), and some mutations were also found within or close to T-cell antigenic clusters. Interestingly, the two most ecologically successful genotypes, E and F, showed a mutation rate 60.3-fold lower than that of the other genotypes (<jats:italic>P<\/jats:italic>&lt; 10<jats:sup>\u22128<\/jats:sup>), suggesting that their efficacy may be the result of a better fitness in dealing with the host immune system rather than of specific virulence factors. Furthermore, the variability exhibited by some genetic variants involved residues that are known to play a critical role during the membrane mechanical movements, contributing to a more stable and flexible porin conformation, which suggests some plasticity to deal with environmental pressure. Globally, these MOMP mutational trends yielded no mosaic structures or important phylogenetic changes, but instead yielded point mutations on specific protein domains, which may enhance pathogen's infectivity, persistence, and transmission.<\/jats:p>","DOI":"10.1128\/jb.00895-09","type":"journal-article","created":{"date-parts":[[2009,9,26]],"date-time":"2009-09-26T01:10:52Z","timestamp":1253927452000},"page":"7182-7192","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":48,"title":["Evolutionary Dynamics of<i>ompA<\/i>, the Gene Encoding the<i>Chlamydia trachomatis<\/i>Key Antigen"],"prefix":"10.1128","volume":"191","author":[{"given":"Alexandra","family":"Nunes","sequence":"first","affiliation":[{"name":"Department of Infectious Diseases, National Institute of Health, Av. Padre Cruz, Lisbon, Portugal"}]},{"given":"Maria J.","family":"Borrego","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, National Institute of Health, Av. Padre Cruz, Lisbon, Portugal"}]},{"given":"Baltazar","family":"Nunes","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, National Institute of Health, Av. Padre Cruz, Lisbon, Portugal"}]},{"given":"Carlos","family":"Florindo","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, National Institute of Health, Av. Padre Cruz, Lisbon, Portugal"}]},{"given":"Joa\u0303o P.","family":"Gomes","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, National Institute of Health, Av. Padre Cruz, Lisbon, Portugal"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"crossref","first-page":"1713","DOI":"10.1086\/314478","volume":"178","year":"1998","unstructured":"Arno, J. N., C. Xie, R. B. Jones, and B. 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