Examples of intron in the following topics:
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- Intron sequences in mRNA do not encode functional proteins.
- The genes of higher eukaryotes very often contain one or more introns.
- While these regions may correspond to regulatory sequences, the biological significance of having many introns or having very long introns in a gene is unclear.
- It is possible that introns slow down gene expression because it takes longer to transcribe pre-mRNAs with lots of introns.
- Spliceosomes recognize sequences at the 5' end of the intron because introns always start with the nucleotides GU and they recognize sequences at the 3' end of the intron because they always end with the nucleotides AG.
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- Post-transcriptional modification is simpler than in eukaryotes, since most archaean genes lack introns, although there are many introns in their transfer RNA and ribosomal RNA genes, and introns may occur in a few protein-encoding genes.
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- RNA splicing allows for the production of multiple protein isoforms from a single gene by removing introns and combining different exons.
- These pre-mRNA transcripts often contain regions, called introns, that are intervening sequences which must be removed prior to translation by the process of splicing.
- It can also occur if portions on an exon are excluded/included or if there is an inclusion of introns.
- Interactions between these sub-units and the small nuclear ribonucleoproteins (snRNP) found in the spliceosome create a spliceosome A complex which helps determine which introns to leave out and which exons to keep and bind together.
- Once the introns are cleaved and removed, the exons are joined together by a phosphodiester bond.
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- Post-transcriptional modification is simpler than in eukaryotes, since most archaean genes lack introns, although there are many introns in their transfer RNA and ribosomal RNA genes, and introns may occur in a few protein-encoding genes.
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- Post-transcriptional modification is simpler than in eukaryotes, since most archaean genes lack introns, although there are many introns in their transfer RNA and ribosomal RNA genes, and introns may occur in a few protein-encoding genes.
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- A significant number of eukaryotic and archaeal pre-tRNAs have introns that have to be spliced out.
- Introns are rarer in bacterial pre-tRNAs, but do occur occasionally and are spliced out.
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- More than 98% of the human genome does not encode protein sequences, including most sequences within introns and most intergenic DNA.
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- Exon shuffling results in new genes by altering the current intron-exon structure.
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- Retrogenes usually lack intronic sequence and often contain poly A sequences that are also integrated into the genome.