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RNA interference

RNA interference is sequence-directed post-transcriptional gene silencing in which small RNAs guide effector complexes to complementary RNA, causing cleavage, degradation, translational repression, or chromatin-associated suppression.

Version
v1 · 2026-09-28 · History
Domain-specific #
11823
Domain group
Natural Sciences
Origin domain
Biology & Ecology
Subdomains
Molecular Biology, Gene Regulation → Biology & Ecology

Core Idea

RNA interference (RNAi) is sequence-directed gene silencing mediated by small RNAs and Argonaute-family effector complexes. Double-stranded or hairpin RNA is processed into short guide duplexes, one strand is retained in an RNA-induced silencing complex, and base pairing directs the complex to complementary RNA or chromatin-associated targets. Depending on organism, guide type, and complementarity, the outcome can be target cleavage, accelerated decay, translational repression, heterochromatin formation, or transcriptional silencing. Small interfering RNAs commonly arise when Dicer cuts longer double-stranded RNA into roughly 21–23-nucleotide duplexes.

Scope of Application

  • Endogenous siRNA pathways. Double-stranded precursors are processed into guides for defense and regulation.

  • MicroRNA biology. Hairpin-derived guides use seed and broader complementarity to modulate multiple transcripts.

  • Genome defense. Plants, fungi, animals, and protists use pathway variants against transposons and invasive nucleic acids.

  • Developmental regulation. Small RNAs tune expression in cell-type and stage-specific programs.

  • Antiviral responses. Organism-specific pathways process or recognize viral RNA.

Clarity

RNA interference names sequence-directed silencing mediated by small-RNA guides and Argonaute-family effectors. It is not any reduction in RNA abundance, and siRNA, miRNA, and chromatin-directed pathways differ in precursor, complementarity, target, and outcome. The term makes guide production, strand selection, base pairing, cleavage or repression, amplification, and off-target effects distinct steps.

Manages Complexity

RNA interference compresses diverse silencing outcomes into precursor RNA, processing enzyme, guide strand, Argonaute complex, target complementarity, and effector response. The analyst tracks which stage and RNA class are present rather than treating any expression decrease as one mechanism. siRNA, miRNA, cleavage, translational repression, decay, chromatin silencing, and organism-specific amplification form branches. Sequence pairing predicts target range and off-target risk; loss of a component localizes pathway failure.

Abstract Reasoning

Recognition move. From a double-stranded RNA precursor, derive small guide RNAs and pair a guide with complementary RNA targets. Silencing move. Infer cleavage, translational repression, or transcript destabilization from complementarity and the participating Argonaute complex. Amplification move. Where the organism supports it, distinguish primary triggers from secondary small-RNA propagation. Experiment move. Use perturbation and rescue to separate on-target silencing from delivery effects and unintended complementarity. Boundary move.

Knowledge Transfer

Within the home domain. RNA interference transfers across gene regulation, functional genomics, therapeutics, development, and antiviral defense when double-stranded RNA yields small guides that direct sequence-complementary silencing through Argonaute complexes. Guide, target, complementarity, cleavage or repression, amplification, and off-targeting retain biological roles. Beyond the home domain (B — shared abstract mechanism). Computing and regulation use guide-like matching to suppress selected outputs, sharing sequence-directed inhibition. Molecular RNA, cellular machinery, and inheritance do not travel. Any reduced transcript is not RNAi, and knockdown alone does not establish target specificity, endogenous function, or therapeutic safety.

Neighborhood in Abstraction Space

RNA interference sits in a sparse region of the domain-specific corpus (82nd percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Unclustered & Miscellaneous (2551 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08