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In this research, duodenal mucosal microbiota was analyzed in 30 cirrhotic patients and 28 healthy controls using 16S rRNA gene pyrosequencing methods. The principal coordinate analysis revealed that cirrhotic patients were colonized by remarkable different duodenal mucosal microbiota in comparison with controls. At the genus level, <jats:italic>Veillonella<\/jats:italic>, <jats:italic>Megasphaera<\/jats:italic>, <jats:italic>Dialister<\/jats:italic>, <jats:italic>Atopobium<\/jats:italic>, and <jats:italic>Prevotella<\/jats:italic> were found overrepresented in cirrhotic duodenum. And the duodenal microbiota of healthy controls was enriched with <jats:italic>Neisseria<\/jats:italic>, <jats:italic>Haemophilus<\/jats:italic>, and <jats:italic>SR1 genera incertae sedis<\/jats:italic>. On the other hand, based on predicted metagenomes analyzed, gene pathways related to nutrient absorption (e.g. sugar and amino acid metabolism) were highly abundant in cirrhosis duodenal microbiota, and functional modules involved in bacterial proliferation and colonization (e.g. bacterial motility proteins and secretion system) were overrepresented in controls. When considering the etiology of cirrhosis, two operational taxonomic units (OTUs), OTU-23 (<jats:italic>Neisseria<\/jats:italic>) and OTU-36 (<jats:italic>Gemella<\/jats:italic>), were found discriminative between hepatitis-B-virus related cirrhosis and primary biliary cirrhosis. The results suggest that the structure of duodenal mucosa microbiota in cirrhotic patients is dramatically different from healthy controls. The duodenum dysbiosis might be related to alterations of oral microbiota and changes in duodenal micro-environment.<\/jats:p>","DOI":"10.1038\/srep34055","type":"journal-article","created":{"date-parts":[[2016,9,30]],"date-time":"2016-09-30T08:53:21Z","timestamp":1475225601000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":173,"title":["Dysbiosis of small intestinal microbiota in liver cirrhosis and its association with etiology"],"prefix":"10.1038","volume":"6","author":[{"given":"Yanfei","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Ji","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Guo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ding","family":"Shi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daiqiong","family":"Fang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lanjuan","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,9,30]]},"reference":[{"key":"BFsrep34055_CR1","doi-asserted-by":"publisher","first-page":"422","DOI":"10.1002\/hep.20632","volume":"41","author":"R Wiest","year":"2005","unstructured":"Wiest, R. & Garcia-Tsao, G. 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