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Canonical Transcript

Definition
AI-generated

A canonical transcript is the representative splice isoform a database or tool uses as the default for a gene—often for displaying consequences, longest coding sequence, or community-curated “principal” isoforms. The exact rule varies by resource (e.g. Ensembl, RefSeq, MANE), so “canonical” is not a single universal sequence.

Topics
Molecular biology
Related
Alternative Splicing Ensembl GENCODE

Why it matters in GWAS

Coding annotations (“missense in gene X”) depend on which transcript is chosen; a variant can be intronic in one isoform and splice-altering in another. Harmonizing TWAS, colocalization, and VEP output requires knowing whether results use canonical, MANE, or all transcripts.

Example usage

"The lead SNP was synonymous in the canonical transcript but fell in an alternative exon used in brain isoforms."

Alternative Splicing Ensembl GENCODE Genome Annotation MANE RefSeq Variant Annotation
Related-term network

Click any node to open that term page.

Node order. The current term is first. Next come every page linked from Related terms, in the same top-to-bottom order as that list. Then new terms appear in two-hop layers: for each of those direct neighbors (in that same order), their related terms are appended if not already listed. A third pass does the same for two-hop nodes. The walk stops when a fixed maximum number of nodes is reached.

References

  • Ji HJ, Pertea M, Salzberg SL. (2026). Annotating genomes at increased scale and resolution. Nat Rev Genet. https://doi.org/10.1038/s41576-026-00937-3
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