A team of Chinese researchers has developed an innovative method for tracking dynamic changes in cellular mRNA expression using nucleoside analogs. The study, published in the KeAi journal Fundamental Research, introduces the incorporation of an adenosine analog, N6-allyladenosine (a6A), into newly transcribed RNAs. By leveraging nucleoside salvage pathways, the researchers were able to label mRNA molecules and subsequently identify base mutation sites through high-throughput sequencing technology.
RNA-sequencing (RNA-seq) is a widely used approach for studying global cellular gene expression and understanding biological processes within cells. However, effectively monitoring the dynamic changes in mRNA expression over time has remained a challenge for researchers. The ability to track these changes would provide valuable insights into transcript behavior and cellular responses.
Led by Jianzhao Liu, a professor at the Institute of Biological Macromolecules, Department of Polymer Science and Engineering of Zhejiang University, the research team explored the potential of nucleoside analogs as chemical sequencing tags. Their focus was on achieving specific labeling of various types of RNA, particularly mRNA.
The researchers discovered that a6A, an adenosine analog, could be recognized and incorporated into newly synthesized cellular mRNA by RNA polymerase. To enable accurate identification of the modified structure, the team employed a chemical iodination treatment that converted a6A within the transcripts into a distinct variant structure. This modification induced base mismatch during RNA reverse transcription, leading to the generation of A-to-C/T mutation reads in subsequent RNA-seq analysis.
"We believe that an increasing number of nucleoside analogs will be explored for uses as chemical sequencing tags with the hope of achieving specific labeling on different kinds of RNA, especially mRNA," explains Liu, the corresponding author of the study.
To validate their findings, the researchers utilized commercially available antibodies suitable for immunoprecipitation of a6A-containing RNA. This enabled them to investigate alterations in cellular gene expression profiles under methionine-free conditions. The team also employed a6A-immunoprecipitation (a6A-IP) as a validation tool to confirm the sequencing results. The integrated approach allowed for a comprehensive and reliable analysis of gene expression dynamics.
"Our technique will enable researchers to track the newly formed a6A-containing transcripts and investigate the dynamics of these transcripts, including RNA synthesis and decay," notes Liu. " a6A provides not only a chemical tag for sequencing but also a tag for antibody enrichment."
By harnessing nucleoside analogs and leveraging the power of high-throughput sequencing, this novel method developed by the Chinese research team offers a promising avenue for researchers to precisely track mRNA dynamics and gain a deeper understanding of cellular processes and gene expression regulation.
RNA-sequencing (RNA-seq) is a widely used approach for studying global cellular gene expression and understanding biological processes within cells. However, effectively monitoring the dynamic changes in mRNA expression over time has remained a challenge for researchers. The ability to track these changes would provide valuable insights into transcript behavior and cellular responses.
Led by Jianzhao Liu, a professor at the Institute of Biological Macromolecules, Department of Polymer Science and Engineering of Zhejiang University, the research team explored the potential of nucleoside analogs as chemical sequencing tags. Their focus was on achieving specific labeling of various types of RNA, particularly mRNA.
The researchers discovered that a6A, an adenosine analog, could be recognized and incorporated into newly synthesized cellular mRNA by RNA polymerase. To enable accurate identification of the modified structure, the team employed a chemical iodination treatment that converted a6A within the transcripts into a distinct variant structure. This modification induced base mismatch during RNA reverse transcription, leading to the generation of A-to-C/T mutation reads in subsequent RNA-seq analysis.
"We believe that an increasing number of nucleoside analogs will be explored for uses as chemical sequencing tags with the hope of achieving specific labeling on different kinds of RNA, especially mRNA," explains Liu, the corresponding author of the study.
To validate their findings, the researchers utilized commercially available antibodies suitable for immunoprecipitation of a6A-containing RNA. This enabled them to investigate alterations in cellular gene expression profiles under methionine-free conditions. The team also employed a6A-immunoprecipitation (a6A-IP) as a validation tool to confirm the sequencing results. The integrated approach allowed for a comprehensive and reliable analysis of gene expression dynamics.
"Our technique will enable researchers to track the newly formed a6A-containing transcripts and investigate the dynamics of these transcripts, including RNA synthesis and decay," notes Liu. " a6A provides not only a chemical tag for sequencing but also a tag for antibody enrichment."
By harnessing nucleoside analogs and leveraging the power of high-throughput sequencing, this novel method developed by the Chinese research team offers a promising avenue for researchers to precisely track mRNA dynamics and gain a deeper understanding of cellular processes and gene expression regulation.