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Neuron-specific ELAV/Hu proteins suppress HuR mRNA during neuronal differentiation by alternative polyadenylation

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Mansfield, Kyle D., Keene, Jack D.·2012·Nucleic Acids Research

Abstract

The ubiquitously expressed RNA-binding protein HuR increases the stability and translation of mRNAs encoding growth regulatory proteins that promote proliferation in a variety of cell types. However, the three neuron-specific ELAV/Hu proteins, HuB, HuC and HuD, while binding to the same types of mRNAs, are required instead for neuronal differentiation, and it becomes difficult to reconcile these contrary functions when all four Hu proteins are expressed in the same neuron. HuR mRNA exists as three alternatively polyadenylated variants, a 1.5-kb testes-specific mRNA isoform, a ubiquitous 2.4-kb isoform and a 6.0-kb isoform that we now show is induced during neuronal differentiation and appears to be neuron-specific. This 6.0-kb neuron-specific mRNA isoform is inherently less stable and produces less HuR protein than the ubiquitous 2.4-kb mRNA. Furthermore, we show that neuronal HuB, HuC and HuD, as well as HuR itself, can bind at the 2.4-kb mRNA polyadenylation site, and when overexpressed can affect alternative polyadenylation to generate an extended HuR 3'-UTR that is translationally suppressed. We propose that the regulation of HuR protein expression by alternative polyadenylation allows neurons to post-transcriptionally regulate mRNAs-encoding factors required for proliferation versus differentiation to facilitate neuronal differentiation.

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  • All four Hu members bind and block U-rich sequences near the 2.4-kb polyadenylation site and thereby promote expression of the 6.0-kb HuR transcript.

    “All four Hu members were found to bind and block U-rich sequences near the 2.4-kb polyadenylation site and thereby promote expression of the 6.0-kb transcript.”

    From Emerging complexity of the HuD/ELAVl4 gene; implications for neuronal development, function, and dysfunction (2013) · cites this paper as Mansfield and Keene 2011

    The Results report that all four Hu proteins bind near the 2.4-kb polyadenylation site and that Hu-protein overexpression increases the 6.0-kb HuR transcript. But the Results describe interference with polyadenylation as potential and say they could not definitively prove a direct effect. The claim overstates the evidence by saying all four were found to block the site and thereby promote the longer transcript. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • All four Hu proteins differentially regulate alternative polyadenylation of HuR in neurons.

    “Moreover, all four Hu proteins were recently demonstrated to differentially regulate alternative polyadenylation of HuR in neurons (Mansfield and Keene 2011; also see Dai et al. 2012).”

    From Emerging complexity of the HuD/ELAVl4 gene; implications for neuronal development, function, and dysfunction (2013) · cites this paper as Mansfield and Keene 2011

    The Introduction (page unavailable) says all four Hu proteins can drive alternative polyadenylation of HuR mRNA to produce a neuron-specific isoform. However, the regulation experiments were conducted in HEK293T cells, not neurons, and the Discussion describes the proteins’ differing efficiencies as an observation that remains to be rigorously tested. The source therefore does not establish that all four differentially regulate HuR polyadenylation in neurons. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • HuR mRNA has three polyadenylation variants (1.5, 2.4, and 6.0 kb) that differ in 3′ UTR length.

    “Mansfield and Keene showed that there are three different HuR mRNA polyadenylation variants (1.5, 2.4, and 6.0 kb), which differ in 3′ UTR length.”
  • The 6.0-kb HuR variant is less stable and not as efficiently translated as the 2.4-kb transcript.

    “Since the 6.0-kb variant is less stable and not as efficiently translated as the 2.4-kb transcript, the authors postulated that the reduction of HuR expression prevents HuR’s ability to promote proliferation and thereby permits neurons to terminally differentiate (Mansfield and Keene 2011).”

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Authors
Mansfield, K. D., & Keene, J. D.
Affiliations
Duke University (US)
Corresponding author
Mansfield, Kyle D.
Venue
Nucleic Acids Research
Published
2011-12-01
Volume
40
Issue
6
Pages
2734-2746
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2091095457
Cited by
112
References
66
Citations by year
2026: 5 · 2025: 4 · 2024: 6 · 2023: 8 · 2022: 8 · 2021: 8 · 2020: 6 · 2019: 8 · 2018: 4 · 2017: 10 · 2016: 7 · 2015: 5 · 2014: 13 · 2013: 15 · 2012: 5
FWCI
4.29
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (0842621)
  • National Institutes of Health (5f32ns059100-02)
  • National Cancer Institute (R01CA157268)
  • National Institute of Neurological Disorders and Stroke (5F32NS059100-02)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
HuR, hubs, HuC, HUD, alternative polyadenylation, neuronal differentiation, mRNA stability, 3' untranslated region, post-transcriptional regulation, RNA-binding proteins, mRNA isoforms, translation suppression
MeSH terms
Cell Line, Gene Expression Regulation, Humans, Neurons, Protein Biosynthesis, 3' Untranslated Regions, RNA Stability, Polyadenylation, ELAV Proteins, Neurogenesis, RNA Isoforms

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