Exon: Difference between revisions
Jump to navigation
Jump to search
exon - new page created |
No edit summary |
||
| Line 1: | Line 1: | ||
When [[MRNA|mRNA]] is produced from [[Eukaryotic|eukaryotic]] [[DNA|DNA]] by [[ | When [[MRNA|mRNA]] is produced from [[Eukaryotic|eukaryotic]] [[DNA|DNA]] by [[RNA polymerase|RNA polymerase]], primarily the [[DNA|DNA]] transcribed creates [[pre-mRNA|pre-mRNA]] which includes both [[Introns|introns]] and exons. | ||
[[Introns|Introns]] are non-coding elements of DNA (however, often have a regulatory function). Exons are the [[Protein|protein]] coding regions of [[DNA|DNA]]. | [[Introns|Introns]] are non-coding elements of DNA (however, often have a regulatory function). Exons are the [[Protein|protein]] coding regions of [[DNA|DNA]]. | ||
Pre-mRNA is processed into mature [[MRNA|mRNA]] - the [[Introns|introns]] are removed, the exons are spliced together and a [[ | Pre-mRNA is processed into mature [[MRNA|mRNA]] - the [[Introns|introns]] are removed, the exons are spliced together and a [[Poly-A tail|poly-A tail]] is added.<br>The mature [[MRNA|mRNA]] is then suitable for [[Translation|translation]]. | ||
[[Prokaryotes|Prokaryotic]] [[DNA|DNA]] only have exons. [[Eukaryotic|Eukaryotic]] [[DNA|DNA]] include [[Introns|introns]] and exons. | [[Prokaryotes|Prokaryotic]] [[DNA|DNA]] only have exons. [[Eukaryotic|Eukaryotic]] [[DNA|DNA]] include [[Introns|introns]] and exons. | ||
Revision as of 08:21, 18 November 2011
When mRNA is produced from eukaryotic DNA by RNA polymerase, primarily the DNA transcribed creates pre-mRNA which includes both introns and exons.
Introns are non-coding elements of DNA (however, often have a regulatory function). Exons are the protein coding regions of DNA.
Pre-mRNA is processed into mature mRNA - the introns are removed, the exons are spliced together and a poly-A tail is added.
The mature mRNA is then suitable for translation.
Prokaryotic DNA only have exons. Eukaryotic DNA include introns and exons.