Fragmentation of CagA reduces hummingbird phenotype induction by helicobactor pylori

Chih Chi Chang, Wein Shung Kuo, Ying Chieh Chen, Chin Lin Perng, Hwai Jeng Lin, Yueh Hsing Ou

研究成果: 雜誌貢獻文章同行評審

13 引文 斯高帕斯(Scopus)


Infection with Helicobacter pylori (H. pylori) has been linked to various gastro-intestinal diseases; nevertheless it remains to be clarified why only a minority of infected individuals develop illness. Studies from the West have indicated that the cagA gene and the associated EPIYA genotype of H. pylori is closely linked to the development of severe gastritis and gastric carcinoma; however, as yet no consistent correlation has been found among the bacteria from East Asia. In addition to genotype variation, the CagA protein undergoes fragmentation; however, the functional significance of fragmentation with respect to H. pylori infection remains unknown. In this study, we isolated 594 H. pylori colonies from 99 patients and examined the fragmentation patterns of CagA protein using immunoblotting. By analyzing the ability of the isolates to induce the host cell morphological transition to the highly invasive hummingbird phenotype, we demonstrated that H. pylori colonies with substantial CagA fragmentation are less potent in terms of causing this morphological transition. Our results uncovered a functional role for CagA fragmentation with respect to H. pylori-induced hummingbird phenotype formation and these findings suggest the possibility that the posttranslational processing of CagA may be involved in H. pylori infection pathogenesis.

期刊PLoS One
出版狀態已發佈 - 3月 1 2016

ASJC Scopus subject areas

  • 農業與生物科學 (全部)
  • 生物化學、遺傳與分子生物學 (全部)
  • 醫藥 (全部)


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