Balances: a New Perspective for Microbiome Analysis

• Published in: mSystems 2018-07, Vol.3 (4)
• Main Authors: Rivera-Pinto, J, Egozcue, J J, Pawlowsky-Glahn, V, Paredes, R, Noguera-Julian, M, Calle, M L
• Format: Article
• Language: English
• Subjects: Accuracy; Algorithms; balances; Ciències de la salut; compositional data; Data analysis; Data processing; HIV; Host-Microbe Biology; Human immunodeficiency virus; Matemàtica aplicada a les ciències; Matemàtiques i estadística; Medicina; Methods and Protocols; microbiome; Microbiomes; Microbiota; Microorganismes; Next-generation sequencing; Phenotypes; Regression analysis; rRNA 16S; Variables; Àrees temàtiques de la UPC
• ISSN: 2379-5077; 2379-5077
• DOI: 10.1128/mSystems.00053-18

High-throughput sequencing technologies have revolutionized microbiome research by allowing the relative quantification of microbiome composition and function in different environments. In this work we focus on the identification of microbial signatures, groups of microbial taxa that are predictive of a phenotype of interest. We do this by acknowledging the compositional nature of the microbiome and the fact that it carries relative information. Thus, instead of defining a microbial signature as a linear combination in real space corresponding to the abundances of a group of taxa, we consider microbial signatures given by the geometric means of data from two groups of taxa whose relative abundances, or balance, are associated with the response variable of interest. In this work we present , a greedy stepwise algorithm for selection of balances or microbial signatures that preserves the principles of compositional data analysis. We illustrate the algorithm with 16S rRNA abundance data from a Crohn's microbiome study and an HIV microbiome study. We propose a new algorithm for the identification of microbial signatures. These microbial signatures can be used for diagnosis, prognosis, or prediction of therapeutic response based on an individual's specific microbiota.