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Nuclear Export of mRNA

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

Regulated mRNA Transport

Regulated mRNA Transport

In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

Nuclear Localization Signals and Import

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...

Nuclear Export

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...

Nuclear Export of mRNA

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

Regulated mRNA Transport

Regulated mRNA Transport

In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

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Related Experiment Video

Updated: Jul 19, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

The extended packaging sequence of MoMLV contains a constitutive mRNA nuclear export function

J A King¹, J M Bridger, F Gounari

¹Department of Cellular Immunology, German Cancer Research Centre, Heidelberg.

|September 22, 1998

Summary

Moloney murine leukaemia virus (MoMLV) sequences enable Rex-independent gene expression in human T-cell leukaemia virus (HTLV-1) vectors. A 312 nt MoMLV element facilitates constitutive mRNA nuclear export, bypassing Rex dependency.

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Area of Science:

Retroviral vector development
Molecular biology
Gene expression regulation

Background:

Human T-cell leukaemia virus type 1 (HTLV-1) gene expression is typically regulated by the Rex protein, which mediates nuclear export of unspliced and spliced viral transcripts.
Moloney murine leukaemia virus (MoMLV) contains sequences that enhance retroviral vector titers, suggesting roles in RNA processing or export.

Purpose of the Study:

To investigate if MoMLV sequences can confer Rex-independent gene expression on HTLV-1 based vectors.
To identify the specific MoMLV sequence responsible for this function and elucidate its mechanism of action.

Main Methods:

Deletion mutagenesis of MoMLV-derived sequences.
Construction of HTLV-1 based expression vectors incorporating MoMLV sequences.
Fluorescent in situ hybridization (FISH) combined with confocal microscopy to analyze RNA localization and expression.

Main Results:

A 312-nucleotide (nt) sequence from MoMLV, overlapping the gag p15/p12 open reading frame, was identified as sufficient for Rex-independent expression.
This 312 nt MoMLV element effectively replaced Rex-mediated nuclear export of transcripts containing HTLV-1 cis-acting repressive elements.
FISH and microscopy confirmed the 312 nt element's ability to promote constitutive mRNA nuclear export.

Conclusions:

The identified MoMLV 'extended packaging sequence' possesses a constitutive mRNA nuclear export function.
This MoMLV element can overcome Rex dependency in HTLV-1 based retroviral vectors, offering a strategy for enhanced gene expression.
The findings provide insights into RNA export mechanisms and have implications for retroviral vector design.