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While BM was conventionally believed to be sterile, recent advanced high throughput technologies have unveiled the presence of diverse microbial communities in BM. These insights into the BM microbiota have mainly originated from uncomplicated pregnancies, possibly not reflecting the circumstances of mothers with pregnancy complications like preterm birth (PTB).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>In this article, we investigated the BM microbial communities in mothers with preterm deliveries (before 37\u00a0weeks of gestation). We compared these samples with BM samples from healthy term pregnancies across different lactation stages (colostrum, transitional and mature milk) using 16S rRNA gene sequencing.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Our analysis revealed that the microbial communities became increasingly diverse and compositionally distinct as the BM matured. Specifically, mature BM samples were significantly enriched in <jats:italic>Veillonella<\/jats:italic> and <jats:italic>lactobacillus<\/jats:italic> (Kruskal Wallis; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) compared to colostrum. The comparison of term and preterm BM samples showed that the community structure was significantly different between the two groups (Bray Curtis and unweighted unifrac dissimilarity; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Preterm BM samples exhibited increased species richness with significantly higher abundance of <jats:italic>Staphylococcus<\/jats:italic><jats:italic> haemolyticus, Propionibacterium acnes, unclassified Corynebacterium species<\/jats:italic>. Whereas term samples were enriched in <jats:italic>Staphylococcus epidermidis, unclassified OD1,<\/jats:italic> and <jats:italic>unclassified Veillonella<\/jats:italic> among others.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Our study underscores the significant influence of pregnancy-related complications, such as preterm birth (before 37 weeks of gestation), on the composition and diversity of BM microbiota. Given the established significance of the maternal microbiome in shaping child health outcomes, this investigation paves the way for identifying modifiable factors that could optimize the composition of BM microbiota, thereby promoting maternal and infant health.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12967-023-04656-9","type":"journal-article","created":{"date-parts":[[2023,11,6]],"date-time":"2023-11-06T13:03:03Z","timestamp":1699275783000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Unveiling the dynamics of the breast milk microbiome: impact of lactation stage and gestational age"],"prefix":"10.1186","volume":"21","author":[{"given":"Parul","family":"Singh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noora","family":"Al Mohannadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Selvasankar","family":"Murugesan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fajr","family":"Almarzooqi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Basirudeen Syed Ahamed","family":"Kabeer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandra Katharina","family":"Marr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tomoshige","family":"Kino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Brummaier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Annalisa","family":"Terranegra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rose","family":"McGready","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fran\u00e7ois","family":"Nosten","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Damien","family":"Chaussabel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4858-7130","authenticated-orcid":false,"given":"Souhaila","family":"Al Khodor","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,11,6]]},"reference":[{"issue":"10017","key":"4656_CR1","doi-asserted-by":"publisher","first-page":"475","DOI":"10.1016\/S0140-6736(15)01024-7","volume":"387","author":"CG Victora","year":"2016","unstructured":"Victora CG, et al. 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