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Sequence- and structure-specific RNA oligonucleotide binding attenuates heterogeneous nuclear ribonucleoprotein A1

Joseph P Clarke1,2, Patricia A Thibault3,2, Sakina Fatima4

  • 1Department of Health Sciences, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada.

Frontiers in Molecular Biosciences
|July 10, 2023
PubMed
Summary

This study explores how RNA oligonucleotides (RNAOs) can mitigate dysfunction in the RNA binding protein heterogeneous nuclear ribonucleoprotein A1 (A1). A1 dysfunction is linked to reduced cell viability and loss, but the molecular mechanisms behind this are unclear. Using computational models and an optogenetic system, the researchers found that RNAOs bind to A1 in a specific way, reducing abnormal cytoplasmic clustering and stress granule formation. RNAO treatment also restored protein translation, which is inhibited by A1 dysfunction. These findings suggest that RNAOs may be a promising therapeutic approach for A1-related cellular dysfunction.

Keywords:
RNA oligonucleotideRNA-protein interactionhnRNPA1optogeneticsstress granulesRNA binding protein dysfunctionoptogenetic modelingRNA oligonucleotide therapycellular homeostasis

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Area of Science:

  • RNA binding protein dysfunction in molecular biology
  • Optogenetic modeling in cell biology

Background:

RNA binding proteins are essential for RNA metabolism and cellular function. Heterogeneous nuclear ribonucleoprotein A1 (A1) plays a key role in these processes. Prior research has shown that A1 dysfunction leads to reduced cell viability and loss. However, the molecular mechanisms behind this dysfunction remain unclear. No prior work had resolved how A1 dysfunction affects cellular processes like stress granule formation or protein translation. This gap motivated the need to explore how A1 dysfunction contributes to cellular stress and how it might be attenuated. Existing knowledge does not address how RNA oligonucleotides might interact with A1 to restore normal function. The uncertainty around A1's role in stress granules and translation inhibition drove the development of new methods to study these effects. This paper aims to clarify these mechanisms and provide a framework for potential therapeutic interventions.

Purpose Of The Study:

This study aimed to investigate how A1 dysfunction affects cellular processes and whether RNA oligonucleotides could mitigate these effects. The specific problem addressed is the lack of understanding of how A1 dysfunction leads to cytoplasmic clustering and stress granule formation. The motivation for the study comes from the need to develop therapies that restore A1 function and cellular homeostasis. The researchers sought to determine if RNA oligonucleotides could bind to A1 in a sequence- and structure-specific manner. They also aimed to assess whether such binding could reduce A1 clustering and its downstream effects. The study focused on using optogenetics to model A1 dysfunction in a controlled environment. The goal was to identify molecular interactions that could be targeted for therapeutic development. This approach allows for a mechanistic understanding of A1 dysfunction and potential interventions.

Main Methods:

The researchers used a combination of computational and experimental methods to study A1 dysfunction. In silico molecular modeling was employed to predict RNA oligonucleotide (RNAO) binding to A1. Thermal shift experiments were conducted to validate these interactions experimentally. An in vitro optogenetic system was used to model A1 dysfunction in a controlled setting. This system allowed the researchers to observe cytoplasmic A1 clustering and stress granule formation. RNAOs were introduced to assess their ability to attenuate A1 dysfunction. The study also monitored downstream effects such as cell stress and protein translation inhibition. These methods enabled the researchers to test the hypothesis that RNAOs could restore normal A1 function. The integration of computational predictions with experimental validation provided a comprehensive approach to understanding RNAO-A1 interactions.

Main Results:

RNA oligonucleotides (RNAOs) bound to the RNA Recognition Motif 1 of A1 in a sequence- and structure-specific manner. Thermal shift experiments confirmed that these interactions stabilized RNAO-A1 binding. Optogenetic modeling revealed that RNAOs significantly reduced abnormal cytoplasmic A1 self-association. This treatment also attenuated A1 cytoplasmic clustering, a key downstream effect of dysfunction. RNAO treatment inhibited stress granule formation, which is associated with cell stress. Protein translation inhibition, another consequence of A1 dysfunction, was restored with RNAO treatment. These findings suggest that RNAOs can mitigate the effects of A1 dysfunction on cellular processes. The results indicate that RNAOs may serve as a therapeutic strategy to restore A1 function and cellular homeostasis.

Conclusions:

The authors concluded that sequence- and structure-specific RNA oligonucleotides (RNAOs) can attenuate A1 dysfunction. RNAO treatment reduced abnormal cytoplasmic A1 self-association and clustering. This intervention also inhibited stress granule formation and restored protein translation. These findings suggest that RNAOs may serve as a potential therapeutic strategy for A1 dysfunction. The study provides evidence that RNAO-A1 interactions are stabilized by specific RNAO sequences and structures. The results support the idea that RNAOs can restore normal A1 function and cellular homeostasis. The authors propose that RNAO treatment could lead to the development of A1-specific therapies. These conclusions are based on the observed effects of RNAOs on A1 dysfunction and downstream cellular processes.

RNA oligonucleotides reduce abnormal A1 cytoplasmic clustering and inhibit stress granule formation.

RNA oligonucleotides bind to the RNA Recognition Motif 1 of A1 in a sequence- and structure-specific manner.

Optogenetics models A1 dysfunction to observe cytoplasmic clustering and stress granule formation in a controlled system.

RNA Recognition Motif 1 is the site where RNA oligonucleotides bind to stabilize A1 function.

A1 dysfunction inhibits protein translation, which is restored by RNA oligonucleotide treatment.

The authors suggest RNA oligonucleotides may serve as therapies to restore A1 function and cellular homeostasis.