Project description:DNA methylation plays important roles in foreign DNA defense, mismatch repair, and gene regulation in prokaryotic genomes. Existing methods for DNA methylation detection using next-generation sequencing (NGS) are incapable of simultaneously detecting multiple types of DNA methylation. Here, we present nitrite treatment followed by sequencing (NT-seq), a sequencing method to simultaneously detect adenine and cytosine methylation. We demonstrated that NT-seq reliably detects three types of methylation motifs in E. coli and H. pylori genomes. We further applied NT-seq to a microbial community standard for de novo methylation motif discovery. Finally, by coupling methyl DNA immunoprecipitation and NT-seq (DIP-NT-seq), we showed that 6mA could be accurately mapped at single-base resolution in the bacterial and eukaryotic genomes. NT-seq thus provides a simple and reliable solution for detecting multiple types of DNA methylations.
Project description:DNA methylation plays important roles in foreign DNA defense, mismatch repair, and gene regulation in prokaryotic genomes. Existing methods for DNA methylation detection using next-generation sequencing (NGS) are incapable of simultaneously detecting multiple types of DNA methylation. Here, we present nitrite treatment followed by sequencing (NT-seq), a sequencing method to simultaneously detect adenine and cytosine methylation. We demonstrated that NT-seq reliably detects three types of methylation motifs in E. coli and H. pylori genomes. We further applied NT-seq to a microbial community standard for de novo methylation motif discovery. Finally, by coupling methyl DNA immunoprecipitation and NT-seq (DIP-NT-seq), we showed that 6mA could be accurately mapped at single-base resolution in the bacterial and eukaryotic genomes. NT-seq thus provides a simple and reliable solution for detecting multiple types of DNA methylations.
Project description:Adenine and cytosine base editors (ABEs and CBEs) represent a new genome editing technology that allows the programmable installation of A-to-G or C-to-T alterations on DNA. We engineered Streptococcus pyogenes Cas9-based adenine and cytosine base editor (SpACE) that enables efficient simultaneous introduction of A-to-G and C-to-T substitutions in the same base editing window on DNA.
Project description:We used RNA-sequencing data to explore the transcriptome-wide effects of cytosine and adenine deaminases on gene expression induced by base editors.