The R2 RNA element is a non-long terminal repeat (non-LTR) retrotransposable element that inserts at a specific site in the 28S ribosomal RNA (rRNA) genes of most insect genomes. In order to insert itself into the genome, retrotransposon encoded protein (R2) protein makes a specific nick in one of the DNA strands at the insertion site and uses the 3′ hydroxyl group exposed by this nick to prime the reverse transcription process termed target primed reverse transcription (TPRT), where the RNA genome is transcribed into DNA.
Read more about R2 RNA Element: 3' UTR Element, 5' UTR Ribozyme, The 5′ R2 Protein Binding Site
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