[The Natural History of Choroideraemia]

Area of Science:

• Ophthalmology
• Genetics
• Rare Diseases

Background:

• Choroideremia (CHM) is an X-linked inherited retinal disease.
• Its natural history has been debated due to low prevalence.
• Emerging therapies necessitate a clearer understanding of CHM progression.

Purpose of the Study:

• To review and synthesize current literature on the natural history of choroideremia.
• To present a simplified two-stage model illustrating key disease aspects.
• To discuss clinical modalities, symmetry, and novel endpoints for CHM research.

Main Methods:

• Comprehensive literature review of choroideremia studies.
• Analysis of clinical features and progression patterns.
• Evaluation of existing study limitations and recommendations for future research.

Main Results:

• A two-stage model is proposed to describe choroideremia progression.
• Key clinical features and their variability are discussed.
• The utility of novel endpoints and the importance of intra-individual symmetry are highlighted.

Conclusions:

• A standardized understanding of choroideremia's natural history is crucial.
• Recommendations are provided for designing future observational trials.
• Improved knowledge will facilitate the development of effective CHM therapies.