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Small nuclear RNA genes in Mendelian disorders
1Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland. stylianos.antonarakis@unige.ch.
Nature Genetics
|December 4, 2025
Summary
High-impact variants in small nuclear RNA (snRNA) genes are linked to Mendelian disorders. Understanding these genetic variations improves diagnostic potential and therapeutic options for conditions like neurodevelopmental delay and retinitis pigmentosa.
Area of Science:
- Genetics and Molecular Biology
- Human Disease Genetics
Background:
- Small nuclear RNA (snRNA) genes are non-protein-coding, essential for pre-mRNA processing.
- Functional snRNAs, with proteins, form spliceosome components (small nuclear ribonucleoproteins).
- The human genome hosts ~2,000 snRNA genes, with most being non-functional pseudogenes.
Purpose of the Study:
- To review high-impact variants in 12 snRNA genes associated with Mendelian disorders.
- To explore the phenotypic consequences of these snRNA gene variants.
- To discuss the functional impact of variants on snRNA processing and spliceosome function.
Main Methods:
- Literature review of studies detailing variants in 12 specific snRNA genes.
- Analysis of reported Mendelian disorders linked to these variants.
- Integration of functional characterization data for affected snRNAs.
Main Results:
- Identified high-impact variants in 12 snRNA genes causing Mendelian disorders.
- Associated phenotypes include neurodevelopmental delay, developmental abnormalities, and retinitis pigmentosa.
- Variants impact snRNA function, leading to disease phenotypes via spliceosome dysfunction.
Conclusions:
- Variants in snRNA genes are a significant cause of Mendelian disorders.
- Understanding snRNA variant consequences enhances diagnostic capabilities for genetic diseases.
- This knowledge may elucidate complex traits, explain disease penetrance, and guide therapeutic strategies.
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