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Cheema AS, Lai CT, Dymock M, Rae A, Geddes DT, Payne MS, Stinson LF. Impact of expression mode and timing of sample collection, relative to milk ejection, on human milk bacterial DNA profiles. J Appl Microbiol 2021; 131:988-995. [PMID: 33421237 DOI: 10.1111/jam.14998] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/21/2020] [Accepted: 01/02/2021] [Indexed: 01/16/2023]
Abstract
AIM To investigate the impact of expression mode: electric breast pump or hand expression, and timing of sample collection: pre- and post-milk ejection on human milk (HM) bacterial DNA profiles. METHODS AND RESULTS Three HM samples from the same breast were collected from 30 breastfeeding mothers: a pre-milk ejection pump-expressed sample (pre-pump), a post-milk ejection pump-expressed sample (post-pump) and a post-milk ejection hand-expressed sample (post-hand). Full-length 16S rRNA gene sequencing was used to assess milk bacterial DNA profiles. Bacterial profiles did not differ significantly based on mode of expression nor timing of sample collection. No significant differences were detected in the relative abundance of any OTUs based on expression condition (pre-pump/ post-pump and post-pump/post-hand) with univariate linear mixed-effects regression analyses (all P-values > 0·01; α = 0·01). Similarly, no difference in richness was observed between sample types (number of observed OTUs: post-pump/post-hand P = 0·13; pre-pump/post-pump P = 0. 45). CONCLUSION Bacterial DNA profiles of HM did not differ according to either expression method or timing of sample collection. SIGNIFICANCE AND IMPACT OF THE STUDY Hand or pump expression can be utilized to collect samples for microbiome studies. This has implications for the design of future HM microbiome studies.
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Affiliation(s)
- A S Cheema
- School of Molecular Sciences, Faculty of Science, The University of Western Australia, Perth, WA, Australia
| | - C T Lai
- School of Molecular Sciences, Faculty of Science, The University of Western Australia, Perth, WA, Australia
| | - M Dymock
- Centre for Applied Statistics, Department of Mathematics and Statistics, Faculty of Engineering and Mathematical Sciences, The University of Western Australia, Perth, WA, Australia
| | - A Rae
- Mathematics and Statistics, School of Engineering and Information Technology, Murdoch University, Perth, WA, Australia
| | - D T Geddes
- School of Molecular Sciences, Faculty of Science, The University of Western Australia, Perth, WA, Australia
| | - M S Payne
- Division of Obstetrics and Gynaecology, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, WA, Australia
| | - L F Stinson
- School of Molecular Sciences, Faculty of Science, The University of Western Australia, Perth, WA, Australia
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Cheema AS, Stinson LF, Lai CT, Geddes DT, Payne MS. DNA extraction method influences human milk bacterial profiles. J Appl Microbiol 2020; 130:142-156. [PMID: 32654260 DOI: 10.1111/jam.14780] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/01/2020] [Accepted: 07/06/2020] [Indexed: 12/19/2022]
Abstract
AIMS To evaluate four DNA extraction methods to elucidate the most effective method for bacterial DNA recovery from human milk (HM). METHODS AND RESULTS Human milk DNA was extracted using the following methods: (i) Qiagen MagAttract Microbial DNA Isolation Kit (kit QM), (ii) Norgen Milk Bacterial DNA Isolation Kit (kit NM), (iii) Qiagen MagAttract Microbiome DNA/RNA Isolation Kit (kit MM) and (iv) TRIzol LS Reagent (method LS). The full-length 16S rRNA gene was sequenced. Kits MM and method LS were unable to extract detectable levels of DNA in 9/11 samples. Detectable levels of DNA were recovered from all samples using kits NM (mean = 0·68 ng μl-1 ) and QM (mean = 0·55 ng μl-1 ). For kits NM and QM, the greatest number of reads were associated with Staphylococcus epidermidis, Streptococcus vestibularis, Propionibacterium acnes, Veillonella dispar and Rothia mucilaginosa. Contamination profiles varied substantially between kits, with one bacterial species detected in negative extraction controls generated with kit QM and six with kit NM. CONCLUSIONS Kit QM is the most suitable of the kits tested for the extraction of bacterial DNA from human milk. SIGNIFICANCE AND IMPACT OF THE STUDY Choice of extraction method impacts the efficiency of bacterial DNA extraction from human milk and the resultant bacterial community profiles generated from these samples.
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Affiliation(s)
- A S Cheema
- School of Molecular Sciences, The University of Western Australia, Perth, WA, Australia
| | - L F Stinson
- School of Molecular Sciences, The University of Western Australia, Perth, WA, Australia
| | - C T Lai
- School of Molecular Sciences, The University of Western Australia, Perth, WA, Australia
| | - D T Geddes
- School of Molecular Sciences, The University of Western Australia, Perth, WA, Australia
| | - M S Payne
- Division of Obstetrics and Gynaecology, The University of Western Australia, Perth, WA, Australia
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Metcalfe JR, Marsh JA, D'Vaz N, Geddes DT, Lai CT, Prescott SL, Palmer DJ. Effects of maternal dietary egg intake during early lactation on human milk ovalbumin concentration: a randomized controlled trial. Clin Exp Allergy 2016; 46:1605-1613. [PMID: 27562481 DOI: 10.1111/cea.12806] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 07/25/2016] [Accepted: 08/16/2016] [Indexed: 01/18/2023]
Abstract
BACKGROUND There is limited understanding of how maternal diet affects breastmilk food allergen concentrations, and whether exposure to allergens through this route influences the development of infant oral tolerance or sensitization. OBJECTIVE To investigate how maternal dietary egg ingestion during early lactation influences egg protein (ovalbumin) levels detected in human breastmilk. METHODS In a randomized controlled trial, women were allocated to a dietary group for the first six weeks of lactation: high-egg diet (> 4 eggs per week), low-egg diet (one-three eggs per week) or an egg-free diet. Breastmilk samples were collected at 2, 4 and 6 weeks of lactation for the measurement of ovalbumin. The permeability of the mammary epithelium was assessed by measuring the breastmilk sodium : potassium ratio. Egg-specific IgE and IgG4 were measured in infant plasma at 6 weeks, and prior to the introduction of egg in solids at 16 weeks. RESULTS Average maternal egg ingestion was associated with breastmilk ovalbumin concentration. Specifically, for each additional egg ingested per week, there was an average 25% increase in ovalbumin concentration (95% CI: 5-48%, P = 0.01). Breastmilk ovalbumin concentrations were significantly higher in the 'high-egg' group (> 4 eggs per week) compared with the 'egg-free' group (P = 0.04). However, one-third of women had no breastmilk ovalbumin detected. No detectable associations were found between mammary epithelium permeability and breastmilk ovalbumin concentrations. Infant plasma egg-specific IgG4 levels were also positively associated with maternal egg ingestion, with an average 22% (95% CI: 3-45%) increase in infant egg-specific IgG4 levels per additional egg consumed per week (P = 0.02). CONCLUSIONS AND CLINICAL RELEVANCE Increased maternal egg ingestion is associated with increased breastmilk ovalbumin, and markers of immune tolerance in infants. These results highlight the potential for maternal diet to benefit infant oral tolerance development during lactation.
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Affiliation(s)
- J R Metcalfe
- School of Paediatrics and Child Health, The University of Western Australia, Perth, WA, Australia
| | - J A Marsh
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia.,School of Mathematics & Statistics, The University of Western Australia, Perth, WA, Australia
| | - N D'Vaz
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia
| | - D T Geddes
- School of Chemistry and Biochemistry, The University of Western Australia, Perth, WA, Australia
| | - C T Lai
- School of Chemistry and Biochemistry, The University of Western Australia, Perth, WA, Australia
| | - S L Prescott
- School of Paediatrics and Child Health, The University of Western Australia, Perth, WA, Australia.,Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia
| | - D J Palmer
- School of Paediatrics and Child Health, The University of Western Australia, Perth, WA, Australia
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Simmer K, Kok C, Nancarrow K, Hepworth AR, Geddes DT. Novel feeding system to promote establishment of breastfeeds after preterm birth: a randomized controlled trial. J Perinatol 2016; 36:210-5. [PMID: 26658121 PMCID: PMC4770056 DOI: 10.1038/jp.2015.184] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 08/31/2015] [Accepted: 10/02/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE We aimed to determine if a novel feeding system where milk only flowed when the preterm infant created a vacuum would influence time to full oral feeds, the length of stay (LOS) in hospital and breastfeeding at discharge. STUDY DESIGN This was a randomized controlled trial in the tertiary neonatal intensive care unit at King Edward Memorial Hospital, Perth, Australia. Eligibility criteria were: preterm infants of gestational age 25 to 34 weeks receiving >75% human milk by gastric tube. Infants were randomly assigned to being fed with a novel teat (NT) or conventional teat (CT). Intention to treat analysis was performed. RESULT Time to full suck feeds was not different between groups. LOS was shorter (mean: 2.5 days; P=0.026) and less formula was fed at discharge in the NT group (P=0.036). CONCLUSION Use of a NT that releases milk when the infant applies vacuum while establishing breastfeeding reduces duration of hospitalization of preterm infants.
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Affiliation(s)
- K Simmer
- Centre for Neonatal Research and Education, School of Pediatrics and Child Health, King Edward Memorial Hospital, Perth, WA, Australia
- School of Paediatrics and Child Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Western Australia, Perth, WA, Australia
| | - C Kok
- Centre for Neonatal Research and Education, School of Pediatrics and Child Health, King Edward Memorial Hospital, Perth, WA, Australia
- School of Paediatrics and Child Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Western Australia, Perth, WA, Australia
| | - K Nancarrow
- Centre for Neonatal Research and Education, School of Pediatrics and Child Health, King Edward Memorial Hospital, Perth, WA, Australia
- School of Paediatrics and Child Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Western Australia, Perth, WA, Australia
| | - A R Hepworth
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Perth, WA, Australia
| | - D T Geddes
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Perth, WA, Australia
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Geddes DT, Kent JC, McClellan HL, Garbin CP, Chadwick LM, Hartmann PE. Sucking characteristics of successfully breastfeeding infants with ankyloglossia: a case series. Acta Paediatr 2010; 99:301-3. [PMID: 19889103 DOI: 10.1111/j.1651-2227.2009.01577.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D T Geddes
- School of Biomolecular, Biomedical and Chemical Sciences, Faculty of Life and Physical Sciences, The University of Western Australia, Crawley, WA, Australia.
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