In Family 2 from Turkey (Fig. S2), serious oligodontia (agenesis of 22 and 24 teeth) was observed in the two compound heterozygotes for WNT10A defects c.433 G > A/p.Val145Met and c.682 T > A/p.Phe228Ile, whereas only four teeth failed to develop in the c.433 G > A or c.682 T > A heterozygotes. This evidence concerns the gene WNT10A and Oligodontia.