GJA1 and Down syndrome: Interestingly, a number of known targets of NOTCH which were found to be affected by TSPEAR silencing in the current study (Fig 3B), have previously been associated with disorders featuring abnormal hair and tooth development including the oculo-dento-digital dysplasia syndrome (MIM257850), the odonto-onycho-dermal dysplasia syndrome (MIM257980), the p63 syndromes (MIM604292) and the tricho-dento-osseous syndrome (MIM190320) caused by mutations in GJA1, WNT10A, TP63 and DLX3, respectively [13,15,33–35].