Modelling phylogeny in 16S rRNA gene sequencing datasets using string-based kernels

Area of Science:

• Microbiology
• Bioinformatics
• Computational Biology

Background:

• The human microbiome plays a crucial role in health.
• 16S rRNA gene sequencing is a common method for studying bacterial communities.
• Phylogenetic relationships within microbial communities are important but often underutilized in analysis.

Purpose of the Study:

• To develop and evaluate novel statistical methods for microbiome data analysis that incorporate phylogenetic information.
• To demonstrate the utility of string kernels from natural language processing for microbiome research.
• To improve host trait prediction by modeling bacterial-host effects across the phylogenetic tree.

Main Methods:

• Proposed a novel family of kernels based on string kernels for microbiome data analysis.
• Applied kernel two-sample tests to assess differences between microbial communities.
• Utilized Gaussian process modeling with string kernels for host trait prediction.

Main Results:

• The proposed kernel two-sample test is sensitive to the phylogenetic scale of differences between bacterial populations.
• Gaussian process modeling effectively infers bacterial-host effects across the phylogenetic tree.
• The methods were successfully applied to a real-world host-trait prediction task.

Conclusions:

• Modeling phylogenetic relationships using string kernels offers a powerful approach for microbiome data analysis.
• These novel methods enhance the ability to detect community differences and predict host traits.
• The findings contribute to a deeper understanding of the microbiome's role in human health.