ArticleThe Journal of molecular diagnostics : JMD2021
Multisite Evaluation and Validation of a Sensitive Diagnostic and Screening System for Spinal Muscular Atrophy that Reports SMN1 and SMN2 Copy Number, along with Disease Modifier and Gene Duplication Variants.
Article in The Journal of molecular diagnostics : JMD, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
6 citing papers in PubMed.
- Multimodal characterisation of the SMN locus in SMA: copy number quantification and hybrid gene identification.NPJ genomic medicine · 2026Article
- Newborn Screening Program for Spinal Muscular Atrophy in the Campania Region (Italy): Current Limitations and Potential Perspectives.International journal of neonatal screening · 2025Article
- Outcomes of a Pilot Newborn Screening Program for Spinal Muscular Atrophy in the Valencian Community.International journal of neonatal screening · 2025Article
- Spinal muscular atrophy in the era of newborn screening: how the classification could change.Frontiers in neurology · 2025Review
- Diving into progress: a review on current therapeutic advancements in spinal muscular atrophy.Frontiers in neurology · 2024Review
- Review
Corrections and comments
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Authors and funding
14 authors.
Funding
Abstract
Spinal muscular atrophy is a severe autosomal recessive disease caused by disruptions in the SMN1 gene. The nearly identical SMN2 gene copy number is associated with disease severity. SMN1 duplication markers, such as c.∗3+80T>G and c.∗211_∗212del, can assess residual carrier risk. An SMN2 disease modifier (c.859G>C) can help inform prognostic outcomes. The emergence of multiple precision gene therapies for spinal muscular atrophy requires accurate and rapid detection of SMN1 and SMN2 copy numbers to enable early treatment and optimal patient outcomes. We developed and evaluated a single-tube PCR/capillary electrophoresis assay system that quantifies SMN1/2 copy numbers and genotypes three additional clinically relevant variants. Analytical validation was performed with human cell lines and whole blood representing varying SMN1/2 copies on four capillary electrophoresis instrument models. In addition, four independent laboratories used the assay to test 468 residual clinical genomic DNA samples. The results were ≥98.3% concordant with consensus SMN1/2 exon 7 copy numbers, determined using multiplex ligation-dependent probe amplification and droplet digital PCR, and were 100% concordant with Sanger sequencing for the three variants. Furthermore, copy number values were 98.6% (SMN1) and 97.1% (SMN2) concordant to each laboratory's own reference results.
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Registered trials
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