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Related Concept Videos

Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
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Nonsense-mediated mRNA Decay02:27

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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.
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Eukaryotic Transcription Activators02:42

Eukaryotic Transcription Activators

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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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Nuclear Export of mRNA02:31

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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...
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Chromatin Structure Regulates pre-mRNA Processing02:41

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Eukaryotic RNA Polymerases00:58

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Related Experiment Video

Updated: Jul 6, 2025

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
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eIF4E1b is a non-canonical eIF4E protecting maternal dormant mRNAs.

Laura Lorenzo-Orts1, Marcus Strobl2, Benjamin Steinmetz2,3

  • 1Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), 1030, Vienna, Austria. laura.lorenzo@imp.ac.at.

EMBO Reports
|January 4, 2024
PubMed
Summary

Germline-specific eIF4E1b protein is crucial for zebrafish oogenesis by storing maternal mRNAs. It binds short polyA tail mRNAs and interacts with eIF4ENIF1, not eIF4G, to regulate translation dormancy.

Keywords:
Maternal mRNAsP-bodiesTranslational RegulationZebrafisheIF4E1b

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Maternal mRNAs are vital for early development and are translationally repressed by polyA tail shortening.
  • Unlike in somatic cells, shortened polyA tails stabilize maternal mRNAs in the germline.
  • Understanding the regulation of maternal mRNA translation is key to early vertebrate development.

Purpose of the Study:

  • To investigate the role of the germline-specific eukaryotic initiation factor 4E paralog, eIF4E1b, in zebrafish oogenesis.
  • To elucidate the mechanism by which eIF4E1b regulates maternal mRNA translation and storage.
  • To explore the interaction partners and localization of eIF4E1b in the context of translational control.

Main Methods:

  • Zebrafish oogenesis and embryo studies.
  • Immunofluorescence to determine eIF4E1b localization to P-bodies.
  • RNA-binding assays to identify mRNA targets of eIF4E1b.
  • In vitro studies with mouse and human eIF4E1B proteins.
  • Co-immunoprecipitation to identify protein interaction partners.

Main Results:

  • eIF4E1b is essential for zebrafish oogenesis and localizes to P-bodies.
  • eIF4E1b binds to mRNAs with short or no polyA tails, including histone mRNAs.
  • Loss of eIF4E1b leads to reduced histone mRNA levels in early gonads, indicating a role in mRNA storage.
  • eIF4E1b interacts with eIF4ENIF1, a translational repressor, and not with eIF4G, distinguishing it from canonical eIF4Es.
  • eIF4ENIF1 is necessary for eIF4E1b's localization to P-bodies.

Conclusions:

  • eIF4E1b plays a critical role in regulating maternal mRNA dormancy during early development.
  • The findings reveal a novel mechanism of translational control involving eIF4E1b and eIF4ENIF1.
  • This study provides new insights into post-transcriptional regulation in vertebrate development.