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Related Experiment Videos

Detection of expanded RNA repeats using thermostable group II intron reverse transcriptase.

Samuel T Carrell1, Zhenzhi Tang2, Sabine Mohr3

  • 1Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY 14611, USA.

Nucleic Acids Research
|October 17, 2017
PubMed
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Quantifying toxic expanded repeat RNAs (ER-RNAs) in genetic disorders is challenging. A novel method using TGIRT-III enzyme successfully detected ER-RNAs in myotonic dystrophy patient samples, aiding therapeutic development.

Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Cellular accumulation of expanded repeat RNAs (ER-RNAs) is implicated in several dominant genetic disorders, including myotonic dystrophy types 1 and 2 (DM1, DM2) and familial amyotrophic lateral sclerosis.
  • These ER-RNAs contribute to disease pathogenesis through a toxic gain-of-function mechanism, making them critical therapeutic targets.
  • Accurate quantification of ER-RNAs and monitoring therapeutic knockdown are hindered by their stable structures, heterogeneity, and background signals from non-expanded repeats.

Purpose of the Study:

  • To develop a reliable method for quantifying ER-RNAs in repeat expansion disorders.
  • To assess the utility of a thermostable group II intron reverse transcriptase (TGIRT-III) for ER-RNA detection and quantification.
  • To evaluate the effectiveness of this method in disease models and patient samples.

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Main Methods:

  • Utilized TGIRT-III for reverse transcription of ER-RNAs into complementary DNA (cDNA).
  • Developed slot blot hybridization techniques to quantify the synthesized cDNA.
  • Optimized conditions to ensure specific cDNA synthesis from ER-RNAs, minimizing off-target amplification.

Main Results:

  • TGIRT-III demonstrated efficient reverse transcription of synthesized ER-RNAs.
  • Slot blot analysis detected ER-RNA-derived cDNA in muscle samples from DM1 and DM2 patients, but not in healthy controls.
  • In DM1 mouse models, the method accurately reflected ER-RNA expression levels across different lines and showed therapeutic reductions following treatment, correlating with improved splicing defects.

Conclusions:

  • TGIRT-III-based cDNA analysis provides a sensitive and specific method for quantifying ER-RNAs in repeat expansion disorders.
  • This approach is effective in detecting ER-RNAs in patient samples and monitoring therapeutic efficacy in preclinical models.
  • The method's applicability to GGGGCC and CCCCGG repeats suggests its potential for diagnosing and managing various repeat expansion diseases.