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In this cross-sectional study, we analyzed endometrial samples from 244 participants, split into 91 EM patients, 56 AM patients, and 97 healthy controls (HC). We conducted untargeted liquid chromatography-mass spectrometry (LC-MS) and 5R 16S rRNA sequencing to examine endometrial metabolome and microbiome profiles. Additionally, we integrated transcriptomic analysis using nine transcriptomic data sets to investigate the biological basis of these conditions. Metabolomic profiling and 16S rRNA sequencing revealed distinct metabolic and microbial signatures. Specific pathways, including linoleic acid and glycerophospholipid metabolism, show significant alterations in both conditions. Notably, four metabolites, including phosphatidylcholine 40:8 [PC(40:8)], exhibited marked changes in both EM and AM, suggesting shared pathological features. Furthermore, taxonomic analysis identified unique bacterial species associated with each condition, particularly those belonging to the phylum Proteobacteria, which correlated with altered metabolic signatures. Machine learning models demonstrated high predictive accuracy for differentiating between AM, EM, and HC based on metabolic and microbial signatures. Integrative analysis with transcriptomic data highlighted distinct pathways related to immune response and signaling transduction for each condition. Our study provides fresh insights into the pathogenesis of AM and EM through a multi-omic approach, suggesting potential inconsistencies in the underlying pathogenetic mechanisms.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>IMPORTANCE<\/jats:title>\n                    <jats:p>Existing research highlighted a connection between endometriosis (EM) and adenomyosis (AM), underscoring their overlapping symptoms and potential shared pathophysiological mechanisms. Although the role of microbiota in inflammatory conditions has been acknowledged, comprehensive investigations into the endometrial microbiota in cases of EM and AM have been limited. Previous studies identified distinct microbial communities associated with these conditions; however, they were constrained by small sample sizes and a lack of integrated analyses of microbiota and metabolomics. Furthermore, the ongoing debate over whether EM and AM should be classified as separate diseases or related phenotypes emphasizes the necessity for further exploration of their molecular interactions. Our study uncovers distinct microbial and metabolic signatures associated with each condition, revealing both shared and unique pathways that may contribute to their pathogenesis. Furthermore, the integration of transcriptomic data offers valuable insights into the complex interactions underlying these disorders.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/msystems.00202-25","type":"journal-article","created":{"date-parts":[[2025,4,22]],"date-time":"2025-04-22T09:01:10Z","timestamp":1745312470000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":17,"title":["The inconsistent pathogenesis of endometriosis and adenomyosis: insights from endometrial metabolome and microbiome"],"prefix":"10.1128","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9204-4227","authenticated-orcid":true,"given":"Chao","family":"Li","sequence":"first","affiliation":[{"name":"Department of Pathology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University","place":["Shanghai, China"]},{"name":"Shanghai Key Laboratory of Maternal Fetal Medicine, Shanghai Institute of Maternal-Fetal Medicine and Gynecologic Oncology, Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinxin","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Gynecology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaojie","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Pathology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3429-2008","authenticated-orcid":false,"given":"Bin","family":"Du","sequence":"additional","affiliation":[{"name":"Department of Pathology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University","place":["Shanghai, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_6_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41574-019-0245-z"},{"key":"e_1_3_6_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41572-018-0008-5"},{"key":"e_1_3_6_4_2","doi-asserted-by":"publisher","DOI":"10.1038\/nm.2826"},{"key":"e_1_3_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.cell.2021.04.041"},{"key":"e_1_3_6_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(72)90781-8"},{"key":"e_1_3_6_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.fertnstert.2007.11.025"},{"key":"e_1_3_6_8_2","doi-asserted-by":"publisher","DOI":"10.1093\/humupd\/dmab017"},{"key":"e_1_3_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.fertnstert.2017.12.030"},{"key":"e_1_3_6_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2011.03.003"},{"key":"e_1_3_6_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2012.06.027"},{"key":"e_1_3_6_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.rbmo.2019.03.210"},{"key":"e_1_3_6_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.fertnstert.2023.03.006"},{"key":"e_1_3_6_14_2","doi-asserted-by":"publisher","DOI":"10.3390\/biom14010032"},{"key":"e_1_3_6_15_2","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0000000000002112"},{"key":"e_1_3_6_16_2","doi-asserted-by":"publisher","DOI":"10.1093\/femsre\/fuv013"},{"key":"e_1_3_6_17_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10482-020-01474-7"},{"key":"e_1_3_6_18_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-020-69112-w"},{"key":"e_1_3_6_19_2","doi-asserted-by":"publisher","DOI":"10.1080\/19490976.2021.1894070"},{"key":"e_1_3_6_20_2","doi-asserted-by":"publisher","DOI":"10.3390\/ijms25126473"},{"key":"e_1_3_6_21_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0263283"},{"key":"e_1_3_6_22_2","doi-asserted-by":"publisher","DOI":"10.1111\/aogs.14847"},{"key":"e_1_3_6_23_2","doi-asserted-by":"publisher","unstructured":"Chen P Wang K Zhuang M Fu X Liu S Chen M et al.. 2023. 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