Dominantly inherited macular dystrophy with flecks (Stargardt)

Area of Science:

• Ophthalmology
• Genetics
• Medical Research

Background:

• Macular dystrophies present with varied clinical features.
• Stargardt disease is typically associated with recessive inheritance and fundus flavimaculatus flecks.
• Previous classifications sometimes distinguished between Stargardt disease with and without flecks, or with dominant inheritance patterns.

Purpose of the Study:

• To investigate the genetic basis and clinical presentation of a family with dominantly inherited macular dystrophy.
• To determine if Stargardt disease can manifest with dominant inheritance and without flecks.
• To clarify the relationship between flecks, cone dysfunction, and the genetic classification of macular dystrophies.

Main Methods:

• Clinical examination of a family with a history of macular dystrophy.
• Detailed ophthalmological assessment, including funduscopy.
• Analysis of hereditary patterns within the family.

Main Results:

• A family presented with dominantly inherited macular dystrophy, characterized by flecks and no significant cone dysfunction.
• The findings suggest that Stargardt disease can arise from at least two distinct genes, one dominant and one recessive.
• Some affected individuals exhibited fundus flavimaculatus flecks, while others did not, indicating variability within the condition.
• Progressive atrophic macular dystrophy without flecks was observed in individuals with dominant inheritance, challenging previous classifications.

Conclusions:

• Stargardt disease is genetically heterogeneous, with both dominant and recessive inheritance patterns identified.
• The presence or absence of flecks is not a definitive criterion for classifying Stargardt disease or related macular dystrophies.
• Dominant inheritance in patients without flecks or major cone dysfunction does not automatically classify them as having cone dystrophy.