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Effect of human milk on type 1 and P-fimbrial mRNA expression in intestinal Escherichia coli strains.

Journal article
Authors Forough Nowrouzian
H-J Monstein
Agnes E Wold
Ingegerd Adlerberth
Published in Letters in applied microbiology
Volume 40
Issue 1
Pages 74-80
ISSN 0266-8254
Publication year 2005
Published at Institute of Laboratory Medicine, Dept of Clinical Bacteriology
Pages 74-80
Language en
Keywords Child, Preschool, DNA-Binding Proteins, metabolism, Escherichia coli, genetics, metabolism, Escherichia coli Proteins, metabolism, Fimbriae, Bacterial, genetics, metabolism, Gene Expression Regulation, Bacterial, Genes, Bacterial, Genes, Switch, Humans, Infant, Infant, Newborn, Integrases, metabolism, Intestines, microbiology, Milk, Human, physiology, RNA, Messenger, metabolism, Reverse Transcriptase Polymerase Chain Reaction
Subject categories Medical and Health Sciences


AIMS: Escherichia coli from breastfed infants express more type 1 fimbriae and less P fimbriae than E. coli from bottle-fed infants. In this study we investigated the effect of human milk on production of mRNA for fimA (type 1 fimbriae) and papC (P fimbriae) in E. coli. METHODS AND RESULTS: Production of adhesin gene mRNA was estimated using a reverse transcriptase polymerase chain reaction in E. coli strains under different culture conditions. More type 1 fimbrial mRNA was produced after culture in human milk (P=0.001) or Luria broth (P=0.014) than after culture on agar, whereas P-fimbrial mRNA production was similar under all tested growth conditions. When cultured on agar, E. coli strains carrying both the fim and pap operons produced less type 1 and P-fimbrial mRNA than strains that had only the fim or pap operons, respectively (P=0.03 and 0.056). SIGNIFICANCE AND IMPACT OF THE STUDY: Environmental regulation of adhesin expression may be influenced by cross-talk between fimbrial operons.

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