Circular RNA expression profile in gingival tissues identifies circ_0062491 and circ_0095812 as potential treatment targets.

Circular RNAs (circRNAs) emerging as a novel class of endogenous, conserved noncoding RNAs, which have been reported to be participated in immune-inflammatory response recently, yet their function in periodontal inflammation has remained elusive. This study aimed to analyze the specific circRNAs expressed in periodontal inflammation process through Illumina (San Diego, CA) sequencing technology combining with experimental validation. The inflamed and healthy gingival tissues from patients were selected to explore the expression statues of circRNAs. In brief, 1304 dysregulated circRNAs were identified in inflamed gingival tissues. Besides, Gene Ontology (GO) enrichment analysis was conducted to investigate the functions of abnormally expressed circRNAs in periodontitis as well as their host-linear genes. Furthermore, the interaction network of circRNAs-miRNAs (microRNA) was constructed to reveal the key circRNAs (circ_0095812, circ_0120299, circ_0125699, circ_0062491, and circ_0043115) in the pathobiology of periodontitis. Subsequently, we have investigated the expression pattern of circ_0062491 (downregulated) and circ_0095812 (upregulated) among 30-paired periodontitis patients and healthy individuals by quantitative real-time polymerase chain reaction. Moreover, circ_0062491 was identified as the sponge of miR-584 which play a key role in periodontitis.