• Yu Hao, Can Tang, Qilian Du, Xuedong Zhou, Xian Peng, and Lei Cheng.
• State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China. Electronic address: haoyu_dentist@163.com.
• Arch. Oral Biol. 2021 Jan 1; 121: 104986.

ObjectivesThe aim of this study was to obtain greater insight into the environmental and genetic factors affecting the oral microbiome.DesignTo this end, we investigated the oral microbiome composition in Han and Zang populations living at different altitudes. The saliva microbiome in 115 individuals from Zang and Han populations living at different altitudes was analyzed using the 16 s rRNA gene sequencing method on the Illumina MiSeq platform. The dominant species in the oral microbiome were verified by quantitative real-time polymerase chain reaction (qPCR) analysis.ResultsThe Han population, living at an altitude of 500 m, had higher microbiome diversity than the Zang population living at altitudes of 3000-4000 m. People living at 3000 m had a higher relative abundance of Leptothrix genus, but people living at 500 m had a higher relative abundance of Capnocytophaga genus according to Lefse difference analysis (P < 0.05). Compared to the Zang population, the Han population had higher relative abundances of Porphyromonas and Treponema genus organisms, especially Porphyromonas (P < 0.001). qPCR analysis confirmed that people living at high altitudes had the highest relative abundance of Porphyromonas gingivalis (P < 0.01).ConclusionsThis study showed that both genetics and the environment had significant influences on the oral microbiome composition. The study proposed a meaningful research direction to explore the relationship between different ethnic and altitude groups and oral diseases, such as periodontal diseases.Copyright © 2020 Elsevier Ltd. All rights reserved.

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