Roles of Helicobacter pylori BabA in gastroduodenal pathogenesis

Table 1 Five major types of H pylori strains that do not produce BabA

babA gene	Status
Negative	Include babA/B chimeras
Present	Regulated by slipped strand repairing and the status is “off” (probably equal to babB/A chimeras)
Present	Lack a translation initiation codon (single case of babA1 in strain CCUG17875)
Present	Have a frameshift mutation(s) causing non-productive translation
Present	Without apparent mutations and without a hypothesis for the lack of expression