Others studies have reported mutations in AXIN2 (HED), CDH1 (blepharocheilodontic syndrome), DSP (Carvajal/Naxos syndrome), EDARADD (HED), EVC2 (EVCS), FGFR2 (Beare–Stevenson syndrome), PCNT (microcephalic osteofysplastic dwarfism type 2), PITX2 (ARS), PTCH1 (basal cell nevus syndrome), IKBKG (incontinentia pigmenti), LEF1 (HED), MSX1 (Witkop’s syndrome), NPHP1 (juvenile nephronophtisis), SRCAP (Floating-Harbor syndrome), and TBCE (Sanjad–Sakati syndrome). The gene discussed is PITX2; the disease is incontinentia pigmenti.