EED-associated overgrowth in a second male patient.

Following our discovery that constitutional mutations in EED can cause overgrowth, we screened our cohort of patients with Weaver-like features for mutations in this gene. Here we describe a second patient with a different, rare and de novo mutation in EED. Phenotypic overlap with our first case of EED-associated overgrowth is significant. Now that we have found two unrelated families of different ethnicities, with a similar rare phenotype, both associated with de novo mutations in this member of the PRC2 complex, we are confident that EED is indeed a novel overgrowth gene.