Genomic DNA was sheared into fragments ranging from 200–300 bp using a Bioruptor ultrasonicator (Diagenode, Seraing, Belgium). A custom capture array (NimbleGen SeqCap®, Roche) was designed and used to capture all coding exons, splice sites, and the flanking intron sequences of THSD4 gene (NM_024817) and 23 other genes already known to be associated with Marfan syndrome and associated disease and heritable thoracic aneurysm and dissections. Amplification, sequencing, and variant annotation were performed as previously described.8 (link),11 (link),15 (link) All variants of interest were systematically confirmed by bidirectional Sanger sequencing primers (in Supplementary table S1).
Additional details concerning materials and methods are found in the Supplementary Information.