Tricho‐dento‐osseous syndrome: Heterogeneity or clinical variability

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Abstract
Tricho‐dento‐osseous (TDO) syndrome is an autosomal dominant disorder characterized by abnormalities of hair, teeth, and bone. We report on a family that seems to illustrate further clinical heterogeneity in the TDO syndrome. Although variable expression of a single TDO gene cannot be ruled out, the manifestations observed in this and other reported families appear to fall into distinct subtypes. This suggests the possibility that the clinical subtypes represent distinct genetic entities.