“…SMC2 was a particularly attractive candidate as it encodes a protein belonging to the cohesion complex. Pathogenic variants in several other cohesion complex genes are associated with Cornelia de Lange syndrome, including NIPBL, SMC1A, SMC3, HDACB, BRD4 , and RAD21 (Deardorff, Bando, et al, 2012; Deardorff, Wilde, et al, 2012; Gil‐Rodríguez et al, 2015; Kline et al, 2018; Musio et al, 2006; Olley et al, 2018). However, when compared to a large cohort of 9q31 patients, both SMC2 and WHRN mapped outside the common region of overlap (CRO) in many patients (Figure 2).…”