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| Regression Analysis of Microbial Substructure Based on Tree-Based LASSO |
| Xu Xiaomin, Lin Yong* |
| (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China) |
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Abstract Human microbial composition and function changes have an important impact on their phenotype or disease. When studying the association of microorganisms with human phenotypes or diseases, not only the individual microbial dynamics, but also the overall impact of the community at the taxonomic level should be considered. In this work, a method of regression analysis of microbial substructure based on tree-based LASSO was proposed to analyze the correlation between microbial community and human phenotype. First, a new penalty function was constructed based on phylogenetic tree structure, and the tree structure is analyzed node by node. Second, 148 samples were tested for complex and sparse substructure regression and coefficient evaluation. The regression results of strains in different substructures were analyzed and compared with the traditional LASSO method. The results showed that this method could highlight the tree structure of microbial communities. The regression coefficients of this method on test nodes were 0.122 and 0.127, which were better than those of the traditional LASSO method (0.106 and 0.118). The advantage of this method in identifying microbial structure was verified. In conclusion, the method could better analyze the association between microbial communities and human phenotypes or diseases.
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Received: 15 November 2018
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