Genome-wide screening of altered m6A-tagged transcript profiles in the hippocampus after traumatic brain injury in mice.

Aim: To systematically profile RNA m6A modification landscape after traumatic brain injury (TBI) in mice. Materials & methods: Expression of m6A-related genes was detected by quantitative real-time PCR (qPCR). Expression and location of METTL3, a key component of m6A methyltransferase complex, were determined by immunostaining. Genome-wide profiling of m6A-tagged transcripts was conducted by m6A-modified RNA immunoprecipitation sequencing (m6A-RIP-seq) and RNA sequencing (RNA-seq). Results: METTL3 was downregulated after TBI. In total, 922 m6A peaks were differentially expressed as determined by m6A-RIP-seq, with 370 upregulated and 552 downregulated. In addition, we identified differentially expressed hypomethylated and hypermethylated mRNA transcripts. Conclusion: Our data provided novel information regarding m6A modification changes in the early period of TBI, which might be promising therapy targets.