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Cloning and comparison of ten gene sequences of a Chilean H. pylori strain with other H. pylori strains revealed higher variability for VacA and CagA virulence factors Biol. Res.
MÜLLER,ILSE; MEDINA-SELBY,ANGELICA; PALACIOS,JOSE LUIS; MARTINEZ,PATRICIO; OPAZO,PATRICIO; BRUCE,ELSA; MANCILLA,MARTA; VALENZUELA,PABLO; YUDELEVICH,ARTURO; VENEGAS,ALEJANDRO.
We have cloned and sequenced ten Helicobacter pylori genes from a Chilean strain (CH-CTX1) including: a cytotoxin VacA fragment, a CagA fragment (A17), a species-specific protein (TsaA), urease subunits (UreA, UreB), a flagellin subunit (FlaB), heat shock proteins (HspA and HspB), adhesin (HpaA) and a lipoprotein (Lpp20). We compared their deduced amino acid sequences with the corresponding sequences from three unrelated H. pylori strains, including fully sequenced strains 26695(UK) and J99(USA), and found that eight of them (UreA, UreB, FlaB, HspA, HspB, Lpp20, TsaA and HpaA) presented more than 97.3% identity. In contrast, VacA partial sequence showed lower identity values (93.2 - 94.9%). Moreover, we found major differences in the A17 region respect to...
Tipo: Journal article Palavras-chave: Chilean H. pylori strain; PCR-cloned genes; HpaA; VacA; CagA sequences.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100010
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