Details

Autor(en) / Beteiligte

• Chen, Xiao
• Sanchis-Juan, Alba
• French, Courtney E
• Connell, Andrew J
• Delon, Isabelle
• Kingsbury, Zoya
• Chawla, Aditi
• Halpern, Aaron L
• Taft, Ryan J
• Bentley, David R
• Butchbach, Matthew E R
• Raymond, F Lucy
• Eberle, Michael A

Titel

Spinal muscular atrophy diagnosis and carrier screening from genome sequencing data

Ist Teil von

• Genetics in medicine, 2020-05, Vol.22 (5), p.945-953

Ort / Verlag

United States: Elsevier Limited

Erscheinungsjahr

2020

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• Spinal muscular atrophy (SMA), caused by loss of the SMN1 gene, is a leading cause of early childhood death. Due to the near identical sequences of SMN1 and SMN2, analysis of this region is challenging. Population-wide SMA screening to quantify the SMN1 copy number (CN) is recommended by the American College of Medical Genetics and Genomics. We developed a method that accurately identifies the CN of SMN1 and SMN2 using genome sequencing (GS) data by analyzing read depth and eight informative reference genome differences between SMN1/2. We characterized SMN1/2 in 12,747 genomes, identified 1568 samples with SMN1 gains or losses and 6615 samples with SMN2 gains or losses, and calculated a pan-ethnic carrier frequency of 2%, consistent with previous studies. Additionally, 99.8% of our SMN1 and 99.7% of SMN2 CN calls agreed with orthogonal methods, with a recall of 100% for SMA and 97.8% for carriers, and a precision of 100% for both SMA and carriers. This SMN copy-number caller can be used to identify both carrier and affected status of SMA, enabling SMA testing to be offered as a comprehensive test in neonatal care and an accurate carrier screening tool in GS sequencing projects.