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Pseudoalignment

Definition
AI-generated

Pseudoalignment determines which transcripts are compatible with each sequencing read (or k-mer sets derived from it) without full base-level alignment to the genome, enabling fast transcript quantification while accounting for multimapping among similar isoforms.

Topics
Sequencing Data Analysis Bioinformatics
Related
Read mapping RNA Sequencing (RNA-seq) Transcript quantification

Why it matters in GWAS

Large-scale eQTL and expression atlases often rely on efficient, reproducible quantification pipelines; understanding pseudoalignment clarifies trade-offs versus genomic alignment for splice junction-level or variant-aware analyses.

Example usage

"We quantified with kallisto using pseudoalignment-derived transcript compatibility counts for speed in the multi-tissue panel."

Read mapping RNA Sequencing (RNA-seq) Transcript quantification
Related-term network

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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

  • Bray NL, Pimentel H, Melsted P, Pachter L. (2016). Near-optimal probabilistic RNA-seq quantification. Nat Biotechnol.
← Pseudo-random number Pseudoautosomal Region (PAR) →

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