Genome-wide maps of mRNAs and ncRNAs in aging and young dental pulp stem cells

Purpose: The goals of this study are to compare differentially expressed genes in young dental pulp stem cells to the aging dental pulp stem cells and to predict key regular factors. Methods: mRNA and ncRNA profiles of young and aging dental pulp stem cells were generated by deep sequencing, using BGISEQ-500 platform (BGI-Shenzhen, China). The sequence reads that passed quality filters were analyzed at the transcript isoform level with two methods: Agilent Technologies 2100 system and real-time quantitative PCR (QPCR) (TaqMan Probe). Results:After filtering out adaptor-related and low-quality sequences, 669 million clean reads in mRNA Library were generated. Clean reads was mapped to genome sequence with the mapping ratio from 88.54% to 97.61%. A total of 230487 mRNAs was obtained including 123724 known mRNAs and 106763 novel mRNAs respectively; In addition, we detected 177880 lncRNAs，139743 and 38137 were known and novel. For correlation analysis, the coefficient we obtained were all greater than 0.90, indicating a high biological correlation Conclusions: Our study represents the first detailed analysis of differentially expressed genes in aging and young dental pulp stem cells, with biologic replicates, generated by RNA-seq technology. The optimized data analysis workflows reported here should provide a framework for comparative investigations of expression profiles. Our results show that hsa-miR-6724-5p may be a key node in the aging process of DPSCs, and its target genes was involved in the dopaminergic synapse mRNA and ncRNA profiles of aging and young dental pulp stem cells