Transcriptome-Wide -Methyladenosine (mA) Methylome Profiling of Heat Stress in Pak-choi ( Ssp. )
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In higher eukaryotes, -methyladenosine (mA) is the most common internal form of messenger RNA modification. By mapping the mA methyl genome in multiple species, the potential regulatory function of reversible mA methylation on mRNA is revealed. Recent studies have shown that RNA mA modification influences mRNA transcription, location, translation, stability, splicing, and nuclear export. However, there are not enough data on the mA transcriptome-wide map and its potential biological role in the heat stress of Pak-choi ( ssp. ). In this work, MeRIP-seq was used to obtain the first transcriptome-wide profiling of RNA mA modification in Pak-choi. Meanwhile, the transcriptome data were obtained by analyzing the input samples' sequencing data. Our research indicated that with three replicates, there were 11,252 common mA peaks and 9729 common mA-containing genes identified in the normal (CK) and heat stress (T43) groups. It was found that mA peaks were highly enriched in the 3' untranslated region in both CK and T43 groups. About 80% of the genes have one mA site. The consensus sequence of mA peaks was also enriched, which showed as AAACCV (V: U/A/G). In addition, association analysis found that there is a certain relationship between the degree of mA methylation and the transcription level, indicating that mA plays a certain regulatory role in gene expression. This comprehensive map in the study may provide a solid basis for determining the potential function of RNA mA modification in Pak-choi under normal (CK) and heat stress (T43) conditions.
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