Dentin dysplasia type I. Radiologic and genetic perspectives in a six-generation family

Area of Science:

• Dentistry
• Genetics
• Human Pathology

Background:

• Dentin dysplasia type I is a rare genetic disorder affecting tooth development.
• Understanding its inheritance patterns is crucial for genetic counseling and diagnosis.

Purpose of the Study:

• To investigate the inheritance pattern of dentin dysplasia type I within a large kindred.
• To confirm the mode of inheritance and penetrance of the condition.

Main Methods:

• Clinical examination and radiographic analysis of 181 members of a kindred.
• Review of reported cases within the family to identify affected individuals.
• Genetic analysis to determine the mode of inheritance.

Main Results:

• 35 members exhibited or were reported to have dentin dysplasia type I; 6 were suspected.
• Radiographic findings confirmed the diagnosis in 18 individuals, showing obliterated pulp chambers and short roots.
• Autosomal dominant inheritance with 100% penetrance was confirmed.

Conclusions:

• Dentin dysplasia type I follows an autosomal dominant inheritance pattern in this kindred.
• The condition demonstrates complete penetrance, meaning all individuals with the gene mutation express the trait.
• Further research is needed to understand the variable expressivity of dentin dysplasia type I.