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Updated: Jul 15, 2025
A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues
Published on: December 5, 2016
PCIF1, the only methyltransferase of N6,2-O-dimethyladenosine
1Department of Gastroenterology, Affiliated Hospital of Jiangsu University, Jiangsu University, Zhenjiang, 212001, Jiangsu, China.
Abstract:
N6-methyladenosine(m6A), is the most abundant post-transcriptional modification of mRNA in biology. When the first nucleotide after the m7G cap is adenosine, it is methylated at the N6 position to form N6,2-O-dimethyladenosine (m6Am). m6Am is a reversible modification located at the first transcribed nucleotide, which is present in about 30% of cellular mRNAs, thus m6Am can have a significant impact on gene expression in the transcriptome. Phosphorylated CTD interaction factor 1(PCIF1), the unique and specific methyltransferase of m6Am, has been shown to affect mRNA stability, transcription, and translation. Several studies have shown that PCIF1 is clearly associated with tumor, viral, and endocrine diseases. Moreover, PCIF1 may be related to the tumor microenvironment, immune cell typing, and programmed cell death protein 1(PD-1) drug resistance. Here, we summarize the mechanism of PCIF1 involvement in mRNA modifications, and outline m6Am modifications and diseases in which PCIF1 is involved. We also summarized the role of PCIF1 in immune and immune checkpoint blockade(ICB) treatment, and predicted the possibility of PCIF1 as a biomarker and therapeutic target.
Insights
N6,2-O-dimethyladenosine (m6Am) is a key mRNA modification impacting gene expression. Phosphorylated CTD interaction factor 1 (PCIF1) methylates m6Am and is linked to various diseases and immune responses.
Area of Science:
- Molecular Biology
- Epigenetics
- Biochemistry
Background:
- N6-methyladenosine (m6A) is the most prevalent mRNA modification.
- N6,2-O-dimethyladenosine (m6Am) is a specific m6A variant found at the first transcribed nucleotide of approximately 30% of mRNAs.
- m6Am modification significantly influences gene expression across the transcriptome.
Purpose of the Study:
- To elucidate the mechanism of Phosphorylated CTD interaction factor 1 (PCIF1) in mRNA modifications.
- To outline the role of m6Am modifications and associated diseases involving PCIF1.
- To summarize PCIF1's function in immune responses and immune checkpoint blockade (ICB) treatment.
Main Methods:
- Literature review and synthesis of existing research on PCIF1 and m6Am.
- Analysis of PCIF1's impact on mRNA stability, transcription, and translation.
- Exploration of PCIF1's association with tumor microenvironment, immune cell typing, and PD-1 drug resistance.
Main Results:
- PCIF1 is the specific methyltransferase for m6Am.
- PCIF1 is implicated in tumor, viral, and endocrine diseases.
- PCIF1 plays a role in immune cell function and resistance to PD-1 therapy.
Conclusions:
- PCIF1 is crucial for m6Am modification and impacts various biological processes.
- PCIF1's involvement in disease pathogenesis and immune response suggests its potential as a therapeutic target.
- Further research into PCIF1 could lead to novel biomarkers and treatment strategies for cancer and other diseases.
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