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Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements
Most current models of mRNA nuclear export in vertebrate cells assume that an mRNA must have specialized signals in order to be exported from the nucleus. Under such a scenario, mRNAs that lack these specialized signals would be shunted into a default pathway where they are retained in the nucleus a...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Cold Spring Harbor Laboratory Press
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4604431/ https://www.ncbi.nlm.nih.gov/pubmed/26362019 http://dx.doi.org/10.1261/rna.051987.115 |
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author | Akef, Abdalla Lee, Eliza S. Palazzo, Alexander F. |
author_facet | Akef, Abdalla Lee, Eliza S. Palazzo, Alexander F. |
author_sort | Akef, Abdalla |
collection | PubMed |
description | Most current models of mRNA nuclear export in vertebrate cells assume that an mRNA must have specialized signals in order to be exported from the nucleus. Under such a scenario, mRNAs that lack these specialized signals would be shunted into a default pathway where they are retained in the nucleus and eventually degraded. These ideas were based on the selective use of model mRNA reporters. For example, it has been shown that splicing promotes the nuclear export of certain model mRNAs, such as human β-globin, and that in the absence of splicing, the cDNA-derived mRNA is retained in the nucleus and degraded. Here we provide evidence that β-globin mRNA contains an element that actively retains it in the nucleus and degrades it. Interestingly, this nuclear retention activity can be overcome by increasing the length of the mRNA or by splicing. Our results suggest that contrary to many current models, the default pathway for most intronless RNAs is to be exported from the nucleus, unless the RNA contains elements that actively promote its nuclear retention. |
format | Online Article Text |
id | pubmed-4604431 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Cold Spring Harbor Laboratory Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-46044312015-11-01 Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements Akef, Abdalla Lee, Eliza S. Palazzo, Alexander F. RNA Article Most current models of mRNA nuclear export in vertebrate cells assume that an mRNA must have specialized signals in order to be exported from the nucleus. Under such a scenario, mRNAs that lack these specialized signals would be shunted into a default pathway where they are retained in the nucleus and eventually degraded. These ideas were based on the selective use of model mRNA reporters. For example, it has been shown that splicing promotes the nuclear export of certain model mRNAs, such as human β-globin, and that in the absence of splicing, the cDNA-derived mRNA is retained in the nucleus and degraded. Here we provide evidence that β-globin mRNA contains an element that actively retains it in the nucleus and degrades it. Interestingly, this nuclear retention activity can be overcome by increasing the length of the mRNA or by splicing. Our results suggest that contrary to many current models, the default pathway for most intronless RNAs is to be exported from the nucleus, unless the RNA contains elements that actively promote its nuclear retention. Cold Spring Harbor Laboratory Press 2015-11 /pmc/articles/PMC4604431/ /pubmed/26362019 http://dx.doi.org/10.1261/rna.051987.115 Text en © 2015 Akef et al.; Published by Cold Spring Harbor Laboratory Press for the RNA Society http://creativecommons.org/licenses/by/4.0/ This article, published in RNA, is available under a Creative Commons License (Attribution 4.0 International), as described at http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Akef, Abdalla Lee, Eliza S. Palazzo, Alexander F. Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title | Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title_full | Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title_fullStr | Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title_full_unstemmed | Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title_short | Splicing promotes the nuclear export of β-globin mRNA by overcoming nuclear retention elements |
title_sort | splicing promotes the nuclear export of β-globin mrna by overcoming nuclear retention elements |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4604431/ https://www.ncbi.nlm.nih.gov/pubmed/26362019 http://dx.doi.org/10.1261/rna.051987.115 |
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