Odonto-onycho-dermal dysplasia

Odonto-onycho-dermal dysplasia (OODD), also known as Arnold-Stickler syndrome, is a rare ectodermal dysplasia syndrome characterized by abnormalities affecting the teeth, nails, skin, and other ectodermal structures. It is caused by biallelic pathogenic variants in the WNT10A gene, which plays a critical role in ectodermal development. The condition belongs to the broader group of ectodermal dysplasias, which are disorders affecting tissues derived from the embryonic ectoderm. Key clinical features include severe oligodontia or hypodontia (congenital absence of multiple teeth), onychodysplasia (nail abnormalities including dystrophic, thin, or spoon-shaped nails), dry skin and hair, palmoplantar hyperkeratosis (thickened skin on the palms and soles), and hyperhidrosis or hypohidrosis (abnormal sweating). Patients may also exhibit smooth tongue (loss of filiform papillae), dry mouth, and sparse or fine hair. The skin findings can be prominent, with keratoderma being a particularly characteristic feature. Some patients may have a distinctive facial appearance. There is no curative treatment for odonto-onycho-dermal dysplasia. Management is symptomatic and multidisciplinary, involving dental rehabilitation with prosthetics or implants to address the significant tooth agenesis, dermatological care for skin manifestations including emollients and keratolytics for hyperkeratosis, and regular monitoring of nail and hair health. Early dental intervention is important for functional and psychosocial well-being. Genetic counseling is recommended for affected families.

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