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Rhesus macaques (RMs) serve as valuable nonhuman primate models due to their similarities to humans in development, placental structure, and immune response. In this study, metagenomic analysis was applied to the placenta, umbilical cord, spleen, gastrointestinal tissues of an unborn RM fetus, and the maternal intestine, revealing the diversity and functionality of microbes in these tissues. Additionally, gut metagenomic data of adult Rhesus macaques from our previous study, along with data from a human fetus obtained from public databases, were included for comparison. We observed substantial microbial sharing between the mother and fetus, with the microbial composition of the placenta and umbilical cord more closely resembling that of the fetal organs than the maternal intestine. Notably, compared with other adult RMs, there was a clear convergence between maternal and fetal microbiota, alongside distinct differences between the microbiota of adults and the fetus, which underscores the unique microbial profiles in fetal environments. Furthermore, the fetal microbiota displayed a less developed carbohydrate metabolism capacity than adult RMs. It also shared antibiotic resistance genes with both maternal and adult RM microbiomes, indicating potential vertical transmission. Comparative analysis of the metagenomes between the RM fetus and a human fetus revealed significant differences in microbial composition and genes, yet also showed similarities in certain abundant microbiota. Collectively, our results contribute to a more comprehensive understanding of the intrauterine microbial environment in macaques.<\/jats:p>","DOI":"10.1002\/ajp.23718","type":"journal-article","created":{"date-parts":[[2024,12,23]],"date-time":"2024-12-23T23:40:04Z","timestamp":1734997204000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Placental and Fetal Microbiota in Rhesus Macaque: A Case Study Using Metagenomic Sequencing"],"prefix":"10.1002","volume":"87","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-8216-7987","authenticated-orcid":false,"given":"Qiao","family":"Du","sequence":"first","affiliation":[{"name":"Key Laboratory of Bio\u2010Resources and Eco\u2010Environment (Ministry of Education), College of Life Sciences Sichuan University Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xu","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Resources and Eco\u2010Environment (Ministry of Education), College of Life Sciences Sichuan University Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rusong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Resources and Eco\u2010Environment (Ministry of Education), College of Life Sciences Sichuan University Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gang","family":"Hu","sequence":"additional","affiliation":[{"name":"SCU\u2010SGHB Joint Laboratory on Nonhuman Primates Research Sichuan Green\u2010house Biotech Co. 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