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Related Concept Videos

Gene Therapy00:59

Gene Therapy

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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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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Non-nuclear Inheritance01:29

Non-nuclear Inheritance

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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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RNA Splicing01:32

RNA Splicing

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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Related Experiment Video

Updated: Feb 7, 2026

Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads

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Gene therapy with modified U1 small nuclear RNA.

Wuh-Liang Hwu1, Yu-May Lee1, Ni-Chung Lee1

  • 1a Department of Pediatrics and Medical Genetics , National Taiwan University Hospital and National Taiwan University College of Medicine , Taipei , Taiwan.

Expert Review of Endocrinology & Metabolism
|August 1, 2018
PubMed
Summary

Gene therapy using U1 small nuclear RNA (snRNA) shows promise for correcting mRNA splicing defects that cause disease. While effective in animal models, further improvements in accuracy and efficacy are needed for clinical use.

Keywords:
5ʹ splice site5’ssU1 snRNAaromatic l-amino acid decarboxylase deficiencygene therapymutation adapted

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Related Experiment Videos

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Small-scale Nuclear Extracts for Functional Assays of Gene-expression Machineries
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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • RNA Therapeutics

Background:

  • Over 15% of disease-causing mutations arise from mRNA splicing defects.
  • U1 small nuclear RNA (snRNA) plays a crucial role in gene splicing by binding to the 5' splice site.
  • Splicing defects can be targeted using modified U1 snRNAs to restore proper gene function.

Purpose of the Study:

  • To review the history, mechanism, and efficacy of U1 snRNA-mediated gene therapy.
  • To discuss the clinical utility and limitations of this therapeutic approach.
  • To provide expert commentary on recent advancements and future directions.

Main Methods:

  • Review of existing literature on U1 snRNA-mediated gene therapy.
  • Analysis of studies involving mutation-adapted and exon-specific U1 snRNAs.
  • Examination of preclinical data from animal models.

Main Results:

  • U1 snRNA-based strategies, including mutation-adapted U1 snRNA, can suppress 5' splice site mutations.
  • Successful application in animal models for conditions like aromatic l-amino acid decarboxylase deficiency and spinal muscular atrophy.
  • U1-mediated therapy offers the advantage of maintaining regulated gene expression.

Conclusions:

  • U1 snRNA-mediated gene therapy is a promising approach for genetic disorders caused by splicing defects.
  • Current limitations include the need for improved accuracy and efficacy before clinical translation.
  • Further research and development are essential for the successful clinical application of this technology.