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Updated: May 13, 2025

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Published on: December 9, 2016
RNA Panel Sequencing Is an Effective Tool to Help Classify Splice Variants for Clinical Oncogenetic Diagnosis
Maud Privat1,2, Flora Ponelle-Chachuat1,2, Sandrine Viala1,2
1Université Clermont Auvergne, INSERM, U1240 Imagerie Moléculaire et Stratégies Théranostiques, Clermont-Ferrand, France.
RNA sequencing of blood samples helps classify variants of unknown significance (VUSs) in cancer genetics. This method aids in identifying pathogenic variants impacting mRNA splicing, improving genetic diagnoses for patients.
Area of Science:
- Clinical Genetics
- Molecular Biology
- Oncology
Background:
- Gene panel analysis frequently identifies variants of unknown significance (VUSs).
- Many VUSs potentially affect mRNA transcription and splicing.
- Predictive software aids in prioritizing VUSs for functional analysis.
Purpose of the Study:
- To assess the utility of blood RNA sequencing for classifying VUSs.
- To investigate the impact of VUSs on mRNA splicing and transcripts.
- To characterize large duplications and deep intronic variants.
Main Methods:
- Targeted RNA sequencing of 48 genes from patient blood samples.
- Analysis of 53 VUSs.
- Reverse transcription-polymerase chain reaction (RT-PCR) and Sanger sequencing.
- Minigene monoallelic analysis when necessary.
Main Results:
- 31 out of 53 VUSs were classified (21 likely neutral, 10 pathogenic/likely pathogenic).
- RNA sequencing effectively classified VUSs with predicted splice effects.
- Demonstrated utility for characterizing large duplications and deep intronic variants.
Conclusions:
- Blood RNA panel sequencing is valuable for VUS classification in clinical oncogenetics.
- This approach enhances diagnostic yield by functionalizing VUSs.
- It aids in identifying complex genetic alterations impacting gene expression.
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