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The gut microbiome has recently emerged as an pathogenic factor of OA, and prebiotics supplementation could alleviate OA symptoms in animal models. However, the relationship between the gut microbiome and OA in the older female adults is hitherto not clear.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Here we studied the gut microbiome of 57 OA patients and their healthy controls by metagenome-wide association study based on previously published data. A significant reduction in the richness and diversity of gut microbiome were observed in OA patients. <jats:italic>Bifidobacterium longum<\/jats:italic> and <jats:italic>Faecalibacterium prausnitzii<\/jats:italic> were decreased while <jats:italic>Clostridium<\/jats:italic> spp. was increased in the OA group. The functional modules, particularly the energetic metabolism and acetate production were also decreased in the OA patients. To evaluate the diagnostic value of identified species for elderly patients with OA, we constructed a set of random forest disease classifiers based on species differences between the two groups. Among them, 9 species reached the lowest classification error in the random forest cross validation, and the area under ROC of the model was 0.81.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Significant alterations in the gut microbial composition and function were observed between the older patients with OA and their controls, and a random forest classifier model for OA were constructed based on the differences in our study. Our study have identified several potential gut microbial targets in the elderly females with OA, which will facilitate the treatment of OA based on gut microbiota, is of great value in alleviating pain and improving the quality of life for them.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12859-021-04199-0","type":"journal-article","created":{"date-parts":[[2021,6,3]],"date-time":"2021-06-03T11:09:23Z","timestamp":1622718563000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Dysbiosis of the gut microbiome is a risk factor for osteoarthritis in older female adults: a case control study"],"prefix":"10.1186","volume":"22","author":[{"given":"Juanjuan","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anqi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,6,3]]},"reference":[{"issue":"1","key":"4199_CR1","doi-asserted-by":"publisher","first-page":"16","DOI":"10.1016\/j.joca.2012.11.012","volume":"21","author":"F Berenbaum","year":"2013","unstructured":"Berenbaum F. 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