Cloning and sequencing of the ompA gene of Enterobacter sakazakii and development of an ompA-targeted PCR for rapid detection of Enterobacter sakazakii in infant formula.
Enterobacter sakazakii is an emerging, infant formula-borne pathogen that causes severe meningitis, meningoencephalitis, sepsis, and necrotizing enterocolitis in neonates and infants, with a high fatality rate. Traditional detection methods take up to 7 days to identify E. sakazakii. The outer membrane protein A gene (ompA), along with its flanking sequences from E. sakazakii (ATCC 51329), was cloned in the pGEM-T Easy vector and sequenced. Comparison of the nucleotide and deduced amino acid sequences of the ompA gene with other sequences available in the GenBank database revealed a high degree of homology with ompA genes of other gram-negative bacteria belonging to the Enterobacteriaceae. Based on regions of the ompA gene unique to E. sakazakii, two primers were synthesized to develop and optimize an E. sakazakii-specific PCR. The PCR amplified a 469-bp DNA product from all E. sakazakii strains tested but not from other bacteria. Experiments to determine the sensitivity of the PCR indicated that it could detect as few as 10(3) CFU/ml of E. sakazakii bacteria in infant formula directly and 10(-1) CFU/ml after an 8-h enrichment step. We conclude that this PCR, combined with enrichment culturing, has the potential to be used as a rapid tool for detecting the presence of E. sakazakii in infant formula.
Mohan Nair
Manoj Kumar
MK
Department of Animal Science, Unit 4040, 3636 Horsebarn Hill Road Extension, Storrs, CT 06269, USA.
Venkitanarayanan
Kumar S
KS
D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics*; D015373:Bacterial Typing Techniques; D003001:Cloning, Molecular; D044083:Cronobacter sakazakii / Q000145:classification / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification*; D003470:Culture Media; D005506:Food Contamination / Q000032:analysis*; D006801:Humans; D007223:Infant; D007225:Infant Food / Q000382:microbiology*; D041943:Infant Formula; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013997:Time Factors
D001425:Bacterial Outer Membrane Proteins; D003470:Culture Media; C078167:OMPA outer membrane proteins