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Yes. Direct RNA sequencing reads the RNA molecule itself rather than first converting it into a DNA copy for sequencing. The phrase “genetic code read directly from RNA” can also mean translating RNA codons into a protein; that is a separate process. Here, “direct” means measuring native RNA to determine its nucleotide sequence.
How nanopore sequencing reads RNA
In nanopore sequencing, an RNA molecule passes through a tiny pore in a membrane. The pore is connected to an electrode and sensor channel. As the molecule moves through, it changes the ionic current; basecalling software interprets that changing signal, often called a “squiggle,” to infer the sequence. Oxford Nanopore explains the sensing process.
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RNA uses the bases A, U, G, and C; DNA uses T instead of U. Although RNA translocates through the pore in the 3′ to 5′ direction, the platform reports reads in the 5′ to 3′ orientation. A read is a sequence call from the signal, not a direct observation of a protein or of what the RNA does in a cell.
What “direct” means—and what it does not mean
In direct RNA sequencing, the native RNA strand is the strand sensed by the pore. That distinguishes it from a common alternative in which RNA is reverse-transcribed into complementary DNA (cDNA) and the cDNA is sequenced instead.
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“Direct” does not mean that the laboratory workflow skips preparation or enzymes. Oxford Nanopore’s SQK-RNA004 workflow makes a complementary cDNA strand to stabilize the RNA and improve sequencing output, but the protocol states that this cDNA strand is not sequenced: “The complementary cDNA strand is not sequenced, but improves the RNA sequencing output.”
Sequencing RNA is not the same as translating it
Sequencing identifies the order of nucleotides in an RNA molecule. Translation is the separate biological process of using codons in a protein-coding RNA to assemble amino acids into a protein. A sequence read can provide the RNA sequence; it does not, by itself, show that the RNA is translated or establish the resulting protein’s abundance or function.
What direct RNA can reveal
Because the measured molecule is native RNA, features of its original chemical modifications can affect the nanopore signal. This is different from sequencing a reverse-transcribed cDNA copy, which does not directly measure the original RNA molecule’s signal. Oxford Nanopore describes direct RNA sequencing as useful for studying RNA modifications and notes potential advantages where amplification bias or difficulty reverse-transcribing a transcript is a concern. Its RNA library-preparation overview discusses these method characteristics.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallModification analysis is not automatic proof that a particular modification is present. It depends on signal-analysis methods, and the vendor’s general capability statements do not establish sensitivity, specificity, or accuracy for every modification, sample, or analysis method.
Direct RNA sequencing versus cDNA-based RNA sequencing
| Consideration | Direct RNA sequencing | cDNA-based RNA sequencing |
|---|---|---|
| Molecule sensed during sequencing | Native RNA | A DNA copy made from RNA |
| Original RNA modifications | Can affect the measured RNA signal | Does not directly measure the original RNA molecule’s signal |
| Amplification and bias | Can be relevant when avoiding PCR-related bias matters | Amplification may be part of a workflow and can introduce bias |
| Difficult-to-reverse-transcribe transcripts | May be useful when reverse transcription is a challenge | Depends on successful reverse transcription |
| Output and workflow trade-off | Requires native RNA preparation and a compatible direct RNA workflow | Oxford Nanopore says its cDNA kits may offer higher output per run when direct RNA’s modification and reduced-PCR-bias advantages are not needed |
The output comparison is Oxford Nanopore’s product characterization, not an independent head-to-head performance result. Neither approach is universally better: the choice depends on whether reading native RNA and its signal matters more than the workflow and output trade-offs. The Direct RNA Sequencing Kit product page describes the kit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the SQK-RNA004 workflow involves
Oxford Nanopore’s protocol describes a laboratory workflow that starts with poly(A)-tailed RNA or total RNA, checks RNA quantity, length, and purity, prepares a stabilizing cDNA strand, ligates sequencing adapters, performs cleanup, and then primes and loads a compatible RNA flow cell. Data acquisition and basecalling use MinKNOW. The protocol estimates about 85 minutes for reverse transcription, 45 minutes for adapter ligation and cleanup, and 10 minutes for priming and loading; these are protocol estimates, not guaranteed hands-on times. See the SQK-RNA004 protocol for its workflow and requirements.
Equipment and compatibility
The protocol lists the Direct RNA Sequencing Kit SQK-RNA004 and compatible RNA flow cells: FLO-MIN004RA for MinION/GridION and FLO-PRO004RA for PromethION. It also calls for RNA quality-control supplies, a thermal cycler, pipettes, and other laboratory equipment. The kit alone is not a complete sequencing system; a compatible device, flow cell, prepared sample, and supporting materials are needed.
Research use
The cited protocol is marked “For Research Use Only.” Direct RNA sequencing should not be presented as a clinical test, and a sequence read alone does not diagnose a condition.
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