SpatialCorr identifies gene sets with spatially varying correlation structure

Recent advances in spatially resolved transcriptomics technologies enable both the measurement of genome-wide gene expression profiles and their mapping to spatial locations within a tissue. A first step in spatial transcriptomics data analysis is identifying genes with expression that varies spatially, and robust statistical methods exist to address this challenge. While useful, these methods do not detect spatial changes in the coordinated expression within a group of genes. To this end, we present SpatialCorr, a method for identifying sets of genes with spatially varying correlation structure. Given a collection of gene sets pre-defined by a user, SpatialCorr tests for spatially induced differences in the correlation of each gene set within tissue regions, as well as between and among regions. An application to cutaneous squamous cell carcinoma demonstrates the power of the approach for revealing biological insights not identified using existing methods.

Automated summary

Recent advances in spatially resolved transcriptomics technologies have enabled the measurement of genome-wide gene expression profiles and their spatial mapping within tissues. This paper introduces SpatialCorr, a method for identifying sets of genes with spatially varying correlation structure. By testing the correlation of each gene set within tissue regions, as well as between and among regions, this method reveals differences in correlation induced by spatial factors.