Expression of periodontitis susceptibility genes in human gingiva using single‐cell RNA sequencing

Objective Single‐cell transcriptomics was used to determine the possible cell‐type specificity of periodontitis susceptibility genes. Background The last decade has witnessed remarkable advances in the field of human genomics. Despite many advances, the genetic factors associated with or contributing to the periodontitis pathogenesis have only been identified to a limited extent and are often poorly validated. Confirming whether a given single nucleotide polymorphism has an association with periodontitis requires a robust mechanistic explanation on the functional consequences of a given genetic variant. Methods We globally assessed the expression of 26 disease‐associated genes identified by GWAS within the gingival mucosa. A total of 12 411 cells from 4 different donors were analysed. Differentially expressed genes were analysed using Seurat, a non‐parametric Wilcoxon rank sum test. The minimum threshold for significance was defined as p