Single Participant Study of an Experimental ASO Treatment for TUBB4A-related Leukodystrophy

This is an interventional study to evaluate the safety and efficacy of treatment with an individualized antisense oligonucleotide (ASO) treatment in a single pediatric participant with a de novo pathogenic gain of function TUBB4A mutation associated with severe leukodystrophy with hypomyelination with atrophy of the basal ganglia and cerebellum (H-ABC)

Inclusion criteria

• Informed consent/assent provided by the participant (when appropriate), and/or participant's parent(s) or legally authorized representative(s).
• Ability to travel to the study site and adhere to study-related follow-up examinations and/or procedures and provide access to participant's medical records.
• Clinical phenotype and neuroimaging consistent with a diagnosis of TUBB4A-related leukodystrophy/Hypomyelination with Atrophy of the Basal Ganglia and Cerebellum (H-ABC)
• Documented genetic mutation in TUBB4A

Exclusion criteria

• Participant has any known contraindication to or unwillingness to undergo lumbar puncture
• Use of investigational medication within 5 half-lives of the drug at enrolment
• Participant has any condition that in the opinion of the Site Investigator, would ultimately prevent the completion of study procedures.