G11.3

Clinical Causes: Genetic mutations in the ATM gene, which is crucial for repairing DNA damage. Inherited in an autosomal recessive pattern, meaning both parents must carry and pass on the faulty gene. Accumulation of DNA damage over time results in nerve cell degeneration, particularly affecting the cerebellum, a brain region responsible for coordinating movement.

Key Symptoms: Progressive cerebellar ataxia (loss of coordination and balance). Telangiectasias—small, widened blood vessels visible on the skin, especially on the eyes and face. Delayed motor milestones in children, such as unsteady walking or difficulty with fine motor skills. Immunodeficiency leading to increased susceptibility to infections. Ocular abnormalities, including abnormal eye movements. Potential development of cancerous growths due to impaired DNA repair mechanisms. Sensorimotor neuropathy and slurred speech as the disease progresses.

Diagnosis Path: Diagnosis of cerebellar ataxia with DNA repair defects involves a combination of clinical evaluation and specialized tests. Physicians will review family history and perform neurological examinations. Confirmatory tests include genetic testing to identify mutations in the ATM gene and other genetic markers. Additional assessments may include blood tests for immune function and imaging studies like MRI to observe cerebellar degeneration.

Treatment Protocols: Currently, there is no cure for this condition. Management focuses on alleviating symptoms and improving quality of life. This may include physical therapy to enhance coordination and balance, speech therapy for communication difficulties, and regular health monitoring for immune deficiencies and cancer risks. Supportive care and multidisciplinary management are essential to address the complex needs of individuals with this disorder.