{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:59:33Z","timestamp":1790657973918,"version":"4.1.0"},"reference-count":76,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T00:00:00Z","timestamp":1790640000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Endocrinol."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Despite significant progress in assisted reproductive technology, in vitro fertilization (IVF) pregnancy rates remain suboptimal. Although the vaginal microbiome has been implicated in IVF outcomes, prior studies often overlooked embryonic aneuploidy, a major confounder. This study aimed to investigate the association between the vaginal microbiome and pregnancy outcomes in euploid embryo transfer cycles.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This prospective study included 109 single euploid blastocyst transfer cycles. Upper vaginal swabs were collected on the transfer day and subjected to 16S rRNA gene sequencing. Microbial \u03b1- and \u03b2-diversity, community state types (CSTs), and differentially abundant taxa were compared between the clinical pregnancy (CP, n = 55) and non-clinical pregnancy (NCP, n = 54) groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The NCP group exhibited significantly higher vaginal microbial richness (Chao1, p = 0.029; ACE, p = 0.029) and distinct \u03b2-diversity compared with the CP group (R\u00b2 = 0.049, p = 0.002), whereas CST distribution did not differ between groups. Within the non-Lactobacillus-dominant CST-IV subgroup, the CP group was relatively enriched in Bifidobacteriaceae (LDA = 5.0) with predicted fermentative pathways, whereas the NCP group showed higher relative abundances of Prevotella (LDA = \u22124.1), Dialister (LDA = \u22123.6), and Peptoniphilus (LDA = \u22122.3), accompanied by predicted tryptophan degradation and oxidative stress pathways.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>These findings, derived mainly from computational prediction, suggest that fine-scale taxonomic and functional composition, rather than broad CST classification, may influence pregnancy outcomes following euploid embryo transfer, offering preliminary insights for microbiome-informed strategies to optimize reproductive outcomes. Future longitudinal studies incorporating shotgun metagenomics and metabolomics in independent cohorts are warranted to validate these preliminary observations and to clarify the dynamic association between vaginal microbiota and IVF pregnancy outcomes.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fendo.2026.1881146","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:46:35Z","timestamp":1790657195000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Beyond community state types: vaginal microbial diversity and CST-IV signatures are associated with pregnancy in euploid embryo transfer cycles"],"prefix":"10.3389","volume":"17","author":[{"given":"Yaoyu","family":"Zou","sequence":"first","affiliation":[{"name":"Reproductive Medical Centre, Department of Obstetrics and Gynecology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine","place":["Shanghai, 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China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Fu","sequence":"additional","affiliation":[{"name":"Shanghai Ji Ai Genetics & IVF Institute, Obstetrics & Gynecology Hospital, Fudan University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yilun","family":"Sui","sequence":"additional","affiliation":[{"name":"Shanghai Ji Ai Genetics & IVF Institute, Obstetrics & Gynecology Hospital, Fudan University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,29]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","DOI":"10.5935\/1518-0557.20210038","article-title":"Comparative analysis of the pregnancy rate via in vitro fertilization vs. previous artificial insemination in patients with unexplained infertility","volume":"26","author":"Mendieta","year":"2022","journal-title":"JBRA Assist 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