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Single-Base tRNA Modification Sequencing
Single-Nucleotide tRNA m7G Modification Seq(m7G-Quant-seq)
m7G-Quant-Seq is an antibody-free, base-resolution approach that quantifies internal m7G on tRNA. Targeted chemical conversion separates internal N7-methylguanosine from the cap, then detects and quantifies internal m7G at base resolution.
Arraystar Single-Nucleotide tRNA m7G Modification Seq(m7G-Quant-Seq) is an end-to-end sample-to-data service for tRNA, from RNA sample QC and tRNA treatment through library construction, sequencing, and bioinformatics. Sites are localized within mature tRNA transcripts with relative coordinates, tRNA gene attribution, anticodon and isotype, and structural-domain localization.
Benefits
In tRNA, internal m7G contributes to structure and function, so site-level mapping is valuable. Targeted conversion isolates internal m7G from the cap, detecting and quantifying internal m7G at base resolution.
Single-base resolution: pinpoints m7G sites in tRNA.
Quantitative measurement: the conversion read-out yields reliable modification fractions.
No antibody dependence: eliminates enrichment bias and cross-reactivity concerns.
Functional annotation: Sites are localized within mature tRNA transcripts with relative coordinates, tRNA gene attribution, anticodon and isotype, and structural-domain localization.
Application-ready: supports decoding fidelity, codon use, aminoacylation, and tRNA structural biology across tRNA isotypes.
| Service Name | Price |
|---|---|
| Single-Nucleotide tRNA m7G Modification Seq(m7G-Quant-Seq) |
Background
In tRNA, the modification stabilizes the folded L-shaped structure and fine-tunes anticodon–codon decoding, so base-resolution mapping within maturation loops and the anticodon is what distinguishes it. A targeted chemical conversion distinguishes internal N7-methylguanosine from the 5' cap, recording each internal m7G site as a distinct reverse-transcription signature for base-resolution quantification. This antibody-free readout maps each m7G site at single-base resolution.
The method was validated for tRNA, sites are localized within mature tRNA transcripts with relative coordinates, tRNA gene attribution, anticodon and isotype, and structural-domain localization. (m7G-quant-seq. ACS Chemical Biology 2022;17(12). PMID: 36398936., DOI: 10.1021/acschembio.2c00792).
Key concept: Single-Nucleotide tRNA m7G Modification Seq(m7G-Quant-Seq) is a base-resolution method in which a targeted chemical conversion distinguishes internal n7-methylguanosine from the 5' cap, detecting and quantifying internal m7G at base resolution.
Figure 1. m7G-Quant-Seq detection scheme. Targeted chemical conversion separates internal N7-methylguanosine from the cap, then detects and quantifies internal m7G at base resolution.
Workflow
A streamlined workflow carries the sample to base-resolution N7-methylguanosine (m⁷G) datasets:
Figure 2. Single-Nucleotide tRNA m7G Modification Seq workflow.
Bioinformatics
Downstream analysis maps reads to a curated reference, calls conversion signatures, and reports internal m7G stoichiometry per position with motif, distribution, differential, enrichment, and genome-browser results.
Deliverables
- Raw m⁷G tRNA sequencing FASTQ data files, formatted for GEO/SRA public database submission.
- QC report with BAM alignment files and key mapping metrics.
- High-confidence single-base m⁷G tRNA site tables (XLSX) with coordinates, anticodon, isotype, and stoichiometry.
- Single-base m⁷G distribution plots across tRNA domains and consensus m⁷G motif logos (PDF/PNG).
- Single-base resolution differential m⁷G tRNA site tables (XLSX) with fold change and significance.
- Genome browser-compatible m⁷G signal track files (bigWig/bedGraph) and a structured tRNA report.
Research Applications
- tRNA decoding fidelity: maps the modification within anticodon and wobble regions.
- Codon use & aminoacylation: relates base-resolution modification to charging and translation.
- tRNA structural biology: localizes sites within D-loop, anticodon, TΨC, and acceptor stem.
- Isotype-resolved analysis: compares modification across tRNA isotypes and isoacceptors.
- Disease-oriented studies: finds differentially modified tRNA sites as biomarkers.
References
[1] m7G-quant-seq: Quantitative Detection of RNA Internal N7-Methylguanosine. ACS Chemical Biology 2022;17(12). DOI: 10.1021/acschembio.2c00792. PMID: 36398936.
Sample Requirements
Sample Storage
For cells/tissue: use TRIzol or an RNA-stabilizing reagent, quick-freeze in liquid nitrogen, and keep at –80 °C.
For RNA: dissolve in ethanol or RNase-free water, store at –80 °C, and limit freeze–thaw cycles.
Dispatch Guidelines
Transfer each sample into a 1.5 mL nuclease-free tube.
Close the tube securely with parafilm or a cap lock to preserve integrity.
Send on dry ice with sufficient insulation to sustain the required temperature.
| Sample Type | Notes |
|---|---|
| Whole blood | Use EDTA tubes only, as heparin is not compatible with subsequent analytical procedures. |
| Cultured cells | Submission of cell pellets is preferred to ensure high-quality material for processing. |
| Tissue | Provide fresh or frozen specimens, ensuring that necrotic material is strictly avoided. |
| Total RNA | Maintain an OD 260/280 ratio ≥ 1.8 and RIN ≥ 7 with no visible degradation. Submit at least 10 µg total RNA. |
FAQ
Which tRNA features are annotated?
Sites are localized within mature tRNA transcripts with relative coordinates, tRNA gene attribution, anticodon and isotype, and structural-domain localization. This lets you interpret each site in the context of its host tRNA isotype and structural domain. The method supports both mRNA and tRNA workflows, so you can choose the readout that matches your study.
Does this method measure the modification at single-base resolution?
Yes. A targeted chemical conversion distinguishes internal N7-methylguanosine from the 5' cap, recording each internal m7G site as a distinct reverse-transcription signature for base-resolution quantification. This provides single-base resolution and absolute stoichiometry for each site in tRNA. The reaction is antibody-free and reproducible, so the calling is specific and the stoichiometry is reliable for downstream functional analyses.
How does this method differ from antibody-based tRNA profiling?
Antibody-based methods rely on enrichment and offer limited resolution with intrinsic motif bias. This method is antibody-free and delivers base-resolution, quantitative calling in tRNA, avoiding cross-reactivity and enrichment bias. This suits projects needing quantitative site-level mapping rather than region-level enrichment, and it pairs well with orthogonal validation.
How does this service support research on m7G modification?
By profiling m7G at base resolution, the service helps researchers explore its roles in RNA function and regulation, providing a valuable evidence base.
Why is high-resolution m7G detection valuable?
Accurate m7G profileping strengthens the evidence behind findings, making it a trusted asset for advancing RNA biology.
!This assay is provided for research applications only and is not intended for clinical diagnosis, treatment, or personal health evaluation.