Single-Base tRNA Modification Sequencing
– Mapping and Quantification of tRNA Modifications at Single-Nucleotide Resolution
Transfer RNAs (tRNAs) contain numerous post-transcriptional modifications that regulate tRNA structure, stability, decoding, and translation. Because modified nucleotides can interfere with reverse transcription and conventional RNA sequencing, specialized modification-specific sequencing strategies are required to accurately identify modification sites.
Arraystar tRNA Single-Base Modification Sequencing Services provide specialized sequencing approaches for mapping and, where supported, quantifying tRNA modifications at single-nucleotide resolution.
Our portfolio covers major tRNA modifications including m7G, pseudouridine (Ψ), m5C, m1A, m3C, 2′-O-methylation (2′-O-Me), dihydrouridine (D), and ac4C.
By converting modification-specific chemical or enzymatic properties into sequencing-compatible signals, these methods enable researchers to investigate the site, distribution, and modification level of tRNA modifications across biological conditions.
Why Single-Base tRNA Modification Sequencing?
Single-Nucleotide Resolution
Determine modification sites at individual nucleotide positions within mature tRNAs, rather than relying solely on transcript-level or enrichment-level measurements.
Modification-Specific Detection
Different modifications have distinct chemical and biochemical properties. Modification-specific sequencing strategies convert these properties into detectable sequencing signatures for site-level analysis.
Quantitative Modification Profiling
Several methods provide quantitative modification measurements based on modification-dependent cleavage, conversion, or sequencing signatures, enabling comparison of modification levels between biological conditions.
tRNA-Aware Analysis
tRNAs are highly structured and heavily modified, and closely related tRNA isodecoders can share substantial sequence similarity. Specialized tRNA workflows and annotation strategies help accurately assign modification signals to individual tRNA species.
Featured Single-Nucleotide tRNA Modification Sequencing Services
- m7G Modification
TRAC-Seq is a chemically based method for unbiased, single-nucleotide-resolution profiling of N7-methylguanosine (m7G) throughout the tRNA transcriptome. TRAC-Seq uses reduction and chemical cleavage at m7G residues to generate cleavage fragments that mark the modification position. Arraystar’s workflow incorporates a tRNA demethylation step to overcome reverse-transcription barriers caused by other tRNA modifications, supporting efficient sequencing of heavily modified tRNAs.
m7G-Quant-Seq provides an alternative quantitative strategy for site-specific m7G profiling. The method uses a targeted chemical conversion strategy to generate a sequencing signature that distinguishes internal m7G from other guanosine positions.
- Pseudouridine (Ψ)
BID-Seq enables site-specific pseudouridine (Ψ) profiling by generating a characteristic sequencing signature following chemical treatment. The resulting signature can be used to identify Ψ-containing positions and assess changes in pseudouridylation between biological conditions.
BACS-Seq provides an alternative chemical strategy for single-base pseudouridine detection.
Using a distinct chemical readout from BID-Seq, BACS-Seq can be used for site-specific Ψ profiling and quantitative analysis.
- m5C Modification
BS-Seq uses bisulfite conversion to distinguish methylated from unmethylated cytidines. Unmodified cytidines undergo conversion, whereas m5C is protected, generating a sequence-level signature that can be used to identify m5C sites.
- m1A Modification
m1A-Quant-Seq is designed for site-specific and quantitative profiling of N1-methyladenosine (m1A) in tRNAs.
m1A can interfere with reverse transcription and produce characteristic sequencing signatures. A modification-aware workflow can exploit these signatures to identify m1A-containing positions and evaluate changes in modification levels.
- m3C Modification
HAC-Seq is a chemical, antibody-free method for transcriptome-wide mapping of tRNA N3-methylcytidine (m3C) at single-nucleotide resolution.
The method uses hydrazine-aniline cleavage to selectively generate cleavage signatures associated with m3C. Arraystar’s workflow incorporates m3C-demethylated controls to distinguish modification-dependent cleavage from background cleavage, enabling reliable site identification and quantitative analysis.
m3C-IP-Seq provides an enrichment-based approach for profiling tRNA m3C modifications at single-nucleotide resolution.
- 2′-O-Methylation (2′-O-Me)
2′-O-methylation differs from base modifications because the methyl group is attached to the 2′-hydroxyl group of the ribose. Consequently, 2′-O-Me requires specialized sequencing strategies based on the chemical or structural properties of the modified ribose.
NM-Seq uses periodate oxidation, β-elimination, and dephosphorylation to generate a sequencing signature associated with 2′-O-methylated nucleotides.
The method can identify 2′-O-Me positions at single-nucleotide resolution and is particularly useful for site-specific mapping of ribose methylation.
RiboMeth-Seq uses the resistance of 2′-O-methylated nucleotides to alkaline fragmentation. Sequencing the resulting RNA fragments produces a protection pattern that can be used to identify and quantify ribose methylation sites.
NM-Seq and RiboMeth-Seq therefore provide complementary approaches to 2′-O-Me profiling, based on different biochemical principles.
- Dihydrouridine (D)
CRACI-Seq is designed for site-specific profiling of dihydrouridine (D) in tRNAs. Dihydrouridine can alter RNA structure and tRNA conformational properties. Modification-specific chemical treatment converts the presence of D into a sequencing-compatible signature for site-level analysis.
- ac4C Modification
ac4C RedaC:T-Seq uses reductive chemistry to convert N4-acetylcytidine (ac4C) into a sequencing-distinguishable signature, enabling ac4C detection at single-nucleotide resolution.
Integrated tRNA Modification Analysis
Single-base modification sequencing can be combined with other tRNA analyses to provide a more comprehensive view of tRNA regulation.
tRNA Sequencing
→ tRNA abundance and expression
Single-Base Modification Sequencing
→ Modification sites and modification levels
tRNA Charging Sequencing
→ tRNA charging status
tRF & tiRNA Sequencing
→ tRNA-derived small RNA production
LC-MS-Based Modification Analysis
→ Global or targeted RNA modification composition
Combining these complementary approaches can help connect tRNA expression → modification → charging → tRNA-derived RNA production → biological function.
Need Help Selecting a tRNA Modification Sequencing Method?
The optimal method depends on the target modification, desired resolution, quantitative requirements, sample type, and available RNA input.
Tell us your target modification, sample type, and research objective. Arraystar scientists can recommend an appropriate tRNA modification sequencing strategy for your study. Discuss Your Project →