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Pre-mRNA Processing: Modification of pre-mRNA Ends

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...

pre-mRNA Processing

pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...

mRNA Stability and Gene Expression

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

mRNA Stability and Gene Expression

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

Nonsense-mediated mRNA Decay

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...

Nonsense-mediated mRNA Decay

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...

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Related Experiment Video

Updated: May 29, 2026

Measurement of Poly A Tail Length from Drosophila Larva Brain and Cell Line

Measurement of Poly A Tail Length from Drosophila Larva Brain and Cell Line

Published on: January 12, 2024

Ending the message: poly(A) signals then and now.

Nick J Proudfoot¹

¹Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom. nicholas.proudfoot@path.ox.ac.uk

Genes & Development

|September 8, 2011

Summary

Polyadenylation signals (PAS) are crucial for eukaryotic gene expression, influencing mRNA processing and transcription termination. Understanding PAS selection is key to deciphering gene regulation and its impact on cellular function.

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Polyadenylation signals (PAS) are essential elements in eukaryotic protein-coding genes, regulating mRNA processing and transcription.
The conserved AAUAAA motif and auxiliary elements are critical for 3'-end cleavage, polyadenylation, and transcriptional termination of pre-mRNA.
Genomic analyses confirm the widespread importance of PAS in eukaryotic mRNA production.

Purpose of the Study:

To review the mechanisms of mRNA 3'-end formation and its communication with RNA polymerase II for transcription termination.
To explore the phenomenon of alternative poly(A) site usage and its interplay with pre-mRNA splicing.
To highlight the necessity of integrating genomic data with specific gene analyses for a comprehensive understanding of PAS function.

Main Methods:

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Last Updated: May 29, 2026

Measurement of Poly A Tail Length from Drosophila Larva Brain and Cell Line

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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

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Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay

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Review of existing literature on polyadenylation signals and mRNA processing.
Analysis of genomic data to establish the generality of PAS.
Discussion of genetic and biochemical approaches for detailed mechanistic studies.

Main Results:

PAS are fundamental for eukaryotic mRNA, impacting both processing and transcription termination.
Alternative poly(A) site usage significantly affects gene expression by influencing mRNA structure and function.
Genomic approaches provide broad insights, but specific gene studies are vital for mechanistic details.

Conclusions:

Polyadenylation signals play a critical role in regulating gene expression through mRNA processing and transcription termination.
Alternative polyadenylation is a key mechanism for modulating gene expression, closely linked with splicing.
A combination of genomic and detailed molecular analyses is required to fully elucidate the complex mechanisms of PAS selection and function.