18S ribosomal RNA (18S rRNA)

18S ribosomal RNA is a highly conserved, non-coding RNA molecule that forms the structural RNA core of the small (40S) subunit of cytoplasmic ribosomes in eukaryotes[1][2][3][5]. It partners with ~33 ribosomal proteins and is essential for accurate decoding of messenger RNA and peptide synthesis; its sequence organization and modifications (such as methylation) play crucial roles in ribosome biogenesis, mRNA positioning, and the regulation of translation fidelity[2][4][5]. The 18S rRNA gene is present in multiple copies per genome, clustered in nucleolar organizer regions, and is a common phylogenetic marker due to its mix of highly conserved and variable sequence regions[1][3][7]. While it is not itself a therapeutic target, experimental disruption of its processing or modification leads to profound cellular consequences, including defective protein synthesis and disease states such as Diamond–Blackfan anemia[6][4]. No drugs are in clinical use that specifically bind or modulate human 18S rRNA, but related strategies are foundational in antibiotic targeting of prokaryotic rRNA and emerging nucleic acid tool development.

Other names

18S rRNAsmall subunit ribosomal RNASSU rRNA

null (not a direct therapeutic target; rRNA-binding small molecules are studied mainly as research tools or in antimicrobial contexts, but human 18S rRNA is not a current drug target)