Precursor mRNA

Precursor mRNA (pre-mRNA) is an immature single strand of messenger ribonucleic acid (mRNA). pre-mRNA is synthesized from a DNA template in the cell nucleus by transcription. pre-mRNA comprises the bulk of heterogeneous nuclear RNA (hnRNA). The term hnRNA is often used as a synonym for pre-mRNA, although strictly speaking hnRNA may include nuclear RNA transcripts that do not end up as cytoplasmic mRNA.

Once pre-mRNA has been completely processed, it is termed "mature messenger RNA", "mature mRNA", or simply "mRNA".

Processing

Eukaryotic pre-mRNA exists only briefly before it is fully processed into mRNA. Pre-mRNAs include two different types of segments, exons and introns. Exons are segments that are retained in the final mRNA, while introns are removed in a process called splicing, which is performed by the spliceosome (except for self-splicing introns).

In prokaryotes, the splicing is done either autocatalytically or through endolytic cleavage. Autocatalytic cleavages, in which no proteins are involved, are usually reserved for sections that code for rRNA while endolytic cleavage corresponds to tRNA precursors.

Additional processing steps attach modifications to the 5' and 3' ends of the prokaryotic pre-mRNA. These include a 5' cap of 7-methylguanosine and a poly-A tail. Additionally, Eukaryotic pre-mRNAs have their introns spliced out by spliceosomes made up of Small Nuclear Ribo-Nucleo Proteins.

When a pre-mRNA strand has been properly processed to an mRNA sequence, it is exported out of the nucleus and eventually translated into a protein – a process accomplished in conjunction with ribosomes.

External links

• Scienceden.com RNA Article