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• W2915027462 abstract "Numerous studies have reported bacterial DNA in first‐pass meconium samples, suggesting that the human gut microbiome is seeded prior to birth. However, these studies have not been able to discriminate between DNA from living bacterial cells, DNA from dead bacterial cells or cell‐free DNA. Here we have used propidium monoazide (PMA) together with 16S rRNA gene sequencing to determine whether there are intact bacterial cells in the fetal gut. DNA was extracted from first‐pass meconium (n = 5) and subjected to 16S rRNA gene sequencing with/without PMA treatment. All meconium samples, regardless of PMA treatment, contained detectable levels of bacterial DNA; however, treatment with PMA prior to DNA extraction decreased the DNA yield by approximately 20%. PMA‐treated meconium samples did not differ significantly from untreated samples in terms of observed number of OTUs (P = 0·945); although they did differ taxonomically, with around one quarter of OTUs identified in untreated samples only, suggesting that they have originated from cell‐free/nonviable DNA. The mean Sørensen coefficient for treated vs untreated samples was 0·527. Our findings suggest that the fetal gut is seeded with intact bacterial cells prior to birth. This is an important finding, as exposure to live bacteria during gestation might have a significant impact on the developing fetus. DNA‐based microbiome studies performed using 16S rRNA gene sequencing are limited by their inability to discriminate between live bacterial cells, dead bacterial cells and cell‐free DNA. Here we use propidium monoazide (PMA) to exclude nonviable bacteria from microbiome analysis of first‐pass meconium samples and thereby reveal that the majority of the purported fetal gut microbiome is from intact bacterial cells. This work demonstrates the importance of excluding nonviable bacteria when analysing the microbial community in low‐biomass samples such as meconium." @default.
• W2915027462 created "2019-02-21" @default.
• W2915027462 creator A5047746141 @default.
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• W2915027462 date "2019-02-15" @default.
• W2915027462 modified "2023-09-27" @default.
• W2915027462 title "Characterization of the bacterial microbiome in first‐pass meconium using propidium monoazide ( <scp>PMA</scp> ) to exclude nonviable bacterial <scp>DNA</scp>" @default.
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• W2915027462 doi "https://doi.org/10.1111/lam.13119" @default.
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