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- Angell, IL, et al.
(författare)
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De novo species identification using 16S rRNA gene nanopore sequencing
- 2020
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Ingår i: PeerJ. - : PeerJ. - 2167-8359. ; 8, s. e10029-
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Tidskriftsartikel (refereegranskat)abstract
- Nanopore sequencing is rapidly becoming more popular for use in various microbiota-based applications. Major limitations of current approaches are that they do not enable de novo species identification and that they cannot be used to verify species assignments. This severely limits applicability of the nanopore sequencing technology in taxonomic applications. Here, we demonstrate the possibility of de novo species identification and verification using hexamer frequencies in combination with k-means clustering for nanopore sequencing data. The approach was tested on the human infant gut microbiota of 3-month-old infants. Using the hexamer k-means approach we identified two new low abundant species associated with vaginal delivery. In addition, we confirmed both the vaginal delivery association for two previously identified species and the overall high levels of bifidobacteria. Taxonomic assignments were further verified by mock community analyses. Therefore, we believe our de novo species identification approach will have widespread application in analyzing microbial communities in the future.
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| 6. |
- Kreyberg, I, et al.
(författare)
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Erratum: "Stopping when knowing: use of snus and nicotine during pregnancy in Scandinavia". Ina Kreyberg, Karen E.S. Bains, Kai-H. Carlsen, Berit Granum, Hrefna K. Gudmundsdóttir, Guttorm Haugen, Gunilla Hedlin, Katarina Hilde, Christine M. Jonassen, Live S. Nordhagen, Björn Nordlund, Katrine D. Sjøborg, Håvard O. Skjerven, Anne C. Staff, Cilla Söderhäll, Riyas M. Vettukattil and Karin C. Lødrup Carlsen on behalf of the PreventADALL study group. ERJ Open Res 2019; 5: 00197-2018
- 2020
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Ingår i: ERJ open research. - : European Respiratory Society (ERS). - 2312-0541. ; 6:1
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Kreyberg, I, et al.
(författare)
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Snus in pregnancy and infant birth size: a mother-child birth cohort study
- 2019
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Ingår i: ERJ open research. - : European Respiratory Society (ERS). - 2312-0541. ; 5:4
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Tidskriftsartikel (refereegranskat)abstract
- While recent studies show that maternal use of snus during pregnancy is increasing, the potential effects on infant birth size is less investigated, with conflicting results.ObjectivesWe aimed to determine if maternal use of snus during pregnancy influences the infant anthropometric and proportional size measures at birth.MethodsIn 2313 mother–child pairs from the population-based, mother–child birth cohort PreventADALL (Preventing Atopic Dermatitis and ALLergies) in Norway and Sweden, we assessed nicotine exposure by electronic questionnaire(s) at 18 and 34 weeks of pregnancy, and anthropometric measurements at birth. Associations between snus exposure and birth size outcomes were analysed by general linear regression.ResultsBirthweight was not significantly different in infants exposed to snus in general, and up to 18 weeks of pregnancy in particular, when adjusting for relevant confounders including maternal age, gestational age at birth, pre-pregnancy body mass index, parity, fetal sex and maternal gestational weight gain up to 18 weeks. We found no significant effect of snus use on the other anthropometric or proportional size measures in multivariable linear regression models. Most women stopped snus use in early pregnancy.ConclusionExposure to snus use in early pregnancy, with most women stopping when knowing about their pregnancy, was not associated with birth size. We were unable to conclude on effects of continued snus use during pregnancy because of lack of exposure in our cohort.
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| 9. |
- Kreyberg, I, et al.
(författare)
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Stopping when knowing: use of snus and nicotine during pregnancy in Scandinavia
- 2019
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Ingår i: ERJ open research. - : European Respiratory Society (ERS). - 2312-0541. ; 5:2
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Tidskriftsartikel (refereegranskat)abstract
- In young women, the use of snus increases in parallel with decreasing smoking rates but the use in pregnancy is unclear. Our aims were to determine the prevalence of snus use, smoking and other nicotine-containing product use during pregnancy, and to identify predictors for snus use in pregnancy.Prevalence was determined for 2528 women in Norway and Sweden based on the Preventing Atopic Dermatitis and ALLergies (PreventADALL) study, a population-based, mother–child birth cohort. Electronic questionnaires were completed in pregnancy week 18 and/or week 34, and potential predictors of snus use were analysed using logistic regression models.Ever use of any snus, tobacco or nicotine-containing products was reported by 35.7% of women, with similar rates of snus use (22.5%) and smoking (22.6%). Overall, 11.3% of women reported any use of nicotine-containing products in pregnancy up to 34 weeks, most often snus alone (6.5%). Most women (87.2%) stopped using snus by week 6 of pregnancy.Snus use in pregnancy was inversely associated with age and positively associated with urban living and personal or maternal history of smoking. While 11.3% of women used snus or other nicotine-containing products at some time, most stopped when recognising their pregnancy. Younger, urban living, previously smoking women were more likely to use snus in pregnancy.
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