Key result
COP-PCR from dried blood spots matches PCR-RFLP with 100% accuracy for SMN1 and SMN2 deletions.
Why the study?
Does COP-PCR from dried blood spots accurately detect SMN1 deletions compared to PCR-RFLP from fresh blood in SMA screening?
Cross-Sectional (n=50)
Does COP-PCR from dried blood spots accurately detect SMN1 deletions compared to PCR-RFLP from fresh blood in SMA screening?
COP-PCR using dried blood spots provides a simple and accurate method for SMN1-deletion detection in SMA screening.
Answers are grounded in this paper and cite their sources.
May facilitate SMA screening via dried blood spots; leaves open larger validation before routine use.
BACKGROUND: Spinal muscular atrophy (SMA) is a common neuromuscular disorder caused by mutations in SMN1. More than 95% of SMA patients carry homozygous SMN1 deletions. Thus, the SMN1 deletion test should be performed initially as part of the diagnostic process. However, SMN2, a highly homologous gene, hampers detection of SMN1 deletion. To differentiate between SMN1 and SMN2, many analysis methods have been developed yet they are not all available worldwide. AIM: To establish a simple but accurate SMN1-deletion detection system that can be used worldwide. METHODS: Fifty DNA samples (29 SMA patients and 21 controls) from dried blood spots (DBS) on filter paper were assayed. All participants had previously been screened for SMA by PCR-restriction fragment length polymorphism (PCR-RFLP) using DNA extracted from freshly collected blood. DNA was extracted from DBS that had been stored at room temperature (20-25℃) for between 1 and 8 years. Competitive oligonucleotide priming-PCR (COP-PCR) was performed to distinguish SMN1 and SMN2 exon7. RESULTS: DNA yield from an 11-mm diameter DBS circle was 21,171 ± 7,485 ng (mean ± SD), with an 260/280 OD ratio from 1.49 to 2.1(mean ± SD; 1.67 ±0.13). Nucleotide sequencing confirmed gene-specific amplification of SMN1 and SMN2 by COP-PCR. SMN1 and SMN2 COP-PCR results are completely consistent with those obtained by PCR-RFLP. CONCLUSION: We have combined DNA extraction from DBS on filter paper with COP-PCR that specifically detects SMN1 and SMN2, establishing a new SMN1-deletion detection system with practical application worldwide.
No takes yet. Share an insight, caveat, or question.
Kato et al. (2015) conducted a cross-sectional in Spinal muscular atrophy (n=50). COP-PCR using dried blood spots vs. PCR-RFLP using freshly collected blood was evaluated on Sensitivity and specificity for SMN1 and SMN2 exon 7 deletion (Sensitivity 1.0, Specificity 1.0). COP-PCR using DNA extracted from dried blood spots demonstrated 100% sensitivity and specificity for detecting SMN1 and SMN2 deletions compared to conventional PCR-RFLP.
Synapse has enriched 8 closely related papers on similar clinical questions. Consider them for comparative context: