{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,28]],"date-time":"2026-06-28T04:45:27Z","timestamp":1782621927695,"version":"3.54.5"},"reference-count":111,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T00:00:00Z","timestamp":1782432000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Life"],"abstract":"<jats:p>Gestational diabetes mellitus (GDM) is an increasingly prevalent metabolic disorder of pregnancy, driven by rising maternal age, obesity, and complex metabolic\u2013inflammatory interactions. Emerging evidence implicates the maternal microbiome as a key modulator of metabolic adaptation during gestation; however, its precise role in GDM pathogenesis remains incompletely defined. This narrative review synthesizes current knowledge on microbiome alterations across gut, vaginal, and oral niches, focusing on their contribution to insulin resistance, metabolic endotoxemia, and immune dysregulation. GDM is consistently associated with reduced microbial diversity, depletion of beneficial taxa (e.g., Akkermansia, Bifidobacterium, Faecalibacterium), and expansion of pro-inflammatory pathobionts, which collectively may impair intestinal barrier integrity and promote low-grade systemic inflammation. These mechanisms are linked to altered insulin signaling and adverse maternal\u2013fetal outcomes. In parallel, microbiome-derived metabolites and early taxonomic signatures have been proposed as potential biomarkers for first-trimester risk stratification, offering an opportunity to overcome the limitations of late diagnostic approaches such as the oral glucose tolerance test. Despite these advances, most available evidence remains associative, with substantial heterogeneity across studies and limited mechanistic validation. The clinical utility of microbiome-based interventions\u2014including dietary modulation, prebiotics, and probiotics\u2014remains promising but inconclusive, with outcomes highly dependent on individual, microbial, and methodological factors. Overall, the maternal microbiome represents a compelling but still evolving target in GDM research. Future progress will depend on standardized methodologies, longitudinal multi-omics studies, and the development of precision medicine approaches capable of integrating microbial, metabolic, and host data. Such advances may enable earlier diagnosis, targeted prevention, and ultimately the disruption of intergenerational metabolic risk.<\/jats:p>","DOI":"10.3390\/life16071065","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T08:43:57Z","timestamp":1782463437000},"page":"1065","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Maternal Microbiome in Gestational Diabetes Mellitus: Mechanisms, Biomarkers, and Therapeutic Perspectives"],"prefix":"10.3390","volume":"16","author":[{"given":"Diana-Maria","family":"Deaconu","sequence":"first","affiliation":[{"name":"Faculty of Biology, Splaiul Independenti 91-95010041, University of Bucharest, 050095 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6384-1822","authenticated-orcid":false,"given":"Gratiela","family":"Gradisteanu Pircalabioru","sequence":"additional","affiliation":[{"name":"Faculty of Biology, Splaiul Independenti 91-95010041, University of Bucharest, 050095 Bucharest, Romania"},{"name":"eBio-Hub Centre of Excellence in Bioengineering, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania"},{"name":"Academy of Romanian Scientists, Ilfov Street, No. 3, 050044 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Octavian","family":"Savu","sequence":"additional","affiliation":[{"name":"\u201cN.C. Paulescu\u201d National Institute of Diabetes, Nutrition and Metabolic Diseases, 020042 Bucharest, Romania"},{"name":"Department of Doctoral School, \u201cCarol Davila\u201d University of Medicine and Pharmacy, 5th District, 050474 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"American Diabetes Association Professional Practice Committee for Diabetes (2026). 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes\u20142026. Diabetes Care, 49, S27\u2013S49.","DOI":"10.2337\/dc26-S002"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1038\/s41572-019-0098-8","article-title":"Gestational diabetes mellitus","volume":"5","author":"McIntyre","year":"2019","journal-title":"Nat. Rev. Dis. 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