High Abundance of Escherichia During the Establishment of Fecal Microbiota in Brazilian Children

Autor(es)

Taddei, Carla R. ^{[1, 2]} ; Oliveira, Fernanda F. ^[2] ; Duarte, Rubens T. D. ^[3] ; Talarico, Silvia T. ^[2] ; Takagi, Elizabeth H. ^[2] ; Ramos Carvalho, Isabel I. ^[2] ; Gomes, Filumena M. S. ^[4] ; Brandt, Katia ^[5] ; Martinez, Marina B. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Clin & Toxicol Anal, Sch Pharmaceut Sci, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Microbial Ecol Lab, Oceanog Inst, Sao Paulo - Brazil

^[4] Univ Sao Paulo, Dept Pediat, Sch Med, Sao Paulo - Brazil

^[5] Med Inst Prof Fernando Figueira, Recife, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MICROBIAL ECOLOGY; v. 67, n. 3, p. 624-634, APR 2014.
• Citações Web of Science: 11

Resumo

The sequence of bacterial events that occurs during the colonization of the gastrointestinal tract may affect the future health of the host. A clear understanding of the colonization process of the human neonatal gut in developing countries is lacking because the few available studies were mostly performed using culture techniques. Using molecular approaches, this study analyzed the fecal microbiota of children of low socioeconomic status in So Paulo, Brazil, during their first year of life. We collected fecal samples of healthy children at 3, 6, and 12 months of life. Total DNA was extracted directly from feces, and the bacteria-specific primers 27F-1492R were used to construct 16S rRNA libraries. Clones were randomly selected and partially sequenced. The main phylogenetic groups identified at 3 months were Streptococcus, unidentified bacteria, and Escherichia. At 6 months, Escherichia remained predominant, while the unidentified bacterial population increased significantly. At 12 months, a more complex composition of fecal microbiota was observed, represented by unidentified bacteria and microorganisms found at low rates at earlier ages. The genus Escherichia remained the most abundant microorganism (34 % relative abundance and 75 % prevalence). Principal component analysis (PCA) revealed changes in the composition of the microbiota at 6 months and an increase of diversity at 12 months of life. Bifidobacterium was identified by quantitative PCR (qPCR) and showed a high incidence in the microbiota at 3 months. The present results corroborate the global observation of inter-individual variability with an early establishment of microbial complexity at the end of the first year of life and highlight the presence of the Escherichia as abundant in microbiota composition of this group of children. (AU)

• Processo FAPESP: 11/51196-7 - Uso de pcr em tempo real para a deteccao e quantificacao da microbiota fecal anaerobica ao longo do primeiro ano de vida.
• Beneficiário: Carla Romano Taddei
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/53959-5 - Analise molecular da microbiota fecal de criancas de um a doze meses usando biblioteca de 16s rrna.
• Beneficiário: Carla Romano Taddei
• Modalidade de apoio: Auxílio à Pesquisa - Regular