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OCR A Biology

Mrna Rna Pre Mrna Mature Added Post Transcriptional/Pre Translational Control Processing

Post-transcriptional control involves processing pre-mRNA through splicing and the addition of protective caps and tails, and can include mRNA editing, to regulate translation.

Post-transcriptional control involves RNA processing, where introns are removed, and protective caps and tails are added to pre-mRNA to create mature mRNA. mRNA editing can further diversify the resulting proteins.

Front Post-transcriptional/pre-translational control
Back
RNA processing and editing;
  • pre-mRNA post-transcription needs conversion to mature mRNA before translation
  • RNA splicing removes introns, cap (modified nucleotide) added to front (5') and tail (chain of adenine nucleotides) added to back (3') to stabilise mRNA and prevent degradation
  • can be further modified via mRNA editing (base addition/sub/deletion), so single pre-mRNA can form multitude of different mature mRNA strands

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