: MeSH: RNA Precursors

Nucleic Acids, Nucleotides, and Nucleosides > Nucleic Acids > RNA > RNA Precursors

Nucleic Acids, Nucleotides, and Nucleosides > Nucleic Acid Precursors > RNA Precursors

RNA Precursors

RNA transcripts of the DNA that are in some unfinished stage of post-transcriptional processing (RNA PROCESSING, POST-TRANSCRIPTIONAL) required for function. RNA precursors may undergo several steps of RNA SPLICING during which the phosphodiester bonds at exon-intron boundaries are cleaved and the introns are excised. Consequently a new bond is formed between the ends of the exons. Resulting mature RNAs can then be used; for example, mature mRNA (RNA, MESSENGER) is used as a template for protein production. The product of RNA polymerase prior to any post-transcriptional modifications (RNA PROCESSING, POST-TRANSCRIPTIONAL), i.e. RNA copies from DNA that exactly represent the genome sequence.

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