Coffin-Siris Syndrome 3, also known as mrd15, is related to coffin-siris syndrome 2 and hypothyroidism, congenital, nongoitrous, 2, and has symptoms including seizures An important gene associated with Coffin-Siris Syndrome 3 is SMARCB1 (SWI/SNF Related, Matrix Associated, Actin Dependent Regulator Of Chromatin, Subfamily B, Member 1). Affiliated tissues include brain and heart, and related phenotypes are high palate and hypotonia