Natural History Study for DNA Repair Disorders

This will be a single-center, single-arm, non-interventional natural history study to evaluate the longitudinal clinical course, functional outcome measures, and candidate biomarkers for individuals with DNA repair disorders, including Cockayne syndrome (CS), xeroderma pigmentosum (XP), and trichothiodystrophy (TTD). Our hypothesis is that a reliable and reproducible baseline natural history course can be established for DNA repair disorders using the Early Childhood Assessment of Balance (ECAB) as a primary endpoint and other measures as secondary and exploratory endpoints that may be used in future therapeutic clinical trials.