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• W2618322744 abstract "Background Previous studies have demonstrated the importance of DNA extraction methods for molecular detection of Staphylococcus, an important bacterial group in cystic fibrosis (CF). We sought to evaluate the effect of enzymatic digestion (EnzD) prior to DNA extraction on bacterial communities identified in sputum and oropharyngeal swab (OP) samples from patients with CF. Methods DNA from 81 samples (39 sputum and 42 OP) collected from 63 patients with CF was extracted in duplicate with and without EnzD. Bacterial communities were determined by rRNA gene sequencing, and measures of alpha and beta diversity were calculated. Principal Coordinate Analysis (PCoA) was used to assess differences at the community level and Wilcoxon Signed Rank tests were used to compare relative abundance (RA) of individual genera for paired samples with and without EnzD. Results Shannon Diversity Index (alpha-diversity) decreased in sputum and OP samples with the use of EnzD. Larger shifts in community composition were observed for OP samples (beta-diversity, measured by Morisita-Horn), whereas less change in communities was observed for sputum samples. The use of EnzD with OP swabs resulted in significant increase in RA for the genera Gemella ( p < 0.01), Streptococcus ( p < 0.01), and Rothia ( p < 0.01). Staphylococcus ( p < 0.01) was the only genus with a significant increase in RA from sputum, whereas the following genera decreased in RA with EnzD: Veillonella ( p < 0.01), Granulicatella ( p < 0.01), Prevotella ( p < 0.01), and Gemella ( p = 0.02). In OP samples, higher RA of Gram-positive taxa was associated with larger changes in microbial community composition. Discussion We show that the application of EnzD to CF airway samples, particularly OP swabs, results in differences in microbial communities detected by sequencing. Use of EnzD can result in large changes in bacterial community composition, and is particularly useful for detection of Staphylococcus in CF OP samples. The enhanced identification of Staphylococcus aureus is a strong indication to utilize EnzD in studies that use OP swabs to monitor CF airway communities." @default.
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• W2618322744 date "2017-05-30" @default.
• W2618322744 modified "2023-09-27" @default.
• W2618322744 title "Impact of enzymatic digestion on bacterial community composition in CF airway samples" @default.
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• W2618322744 doi "https://doi.org/10.7717/peerj.3362" @default.
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