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Angelman Syndrome| Part 1 MAD: Cohort A


HALOS: A Safety, Tolerability, Pharmacokinetics and Pharmacodynamics Study of Multiple Ascending Doses of ION582 in Participants With Angelman Syndrome

This is a Phase 1-2a, open-label dose-escalation study of ION582 enrolling up to approximately 44 participants. Following a screening period of up to 4 weeks, eligible participants will receive intrathecal (IT) injections of ION582. Participants will be followed for up to 32 weeks after dosing.

Part 1 MAD: Cohort A

Purpose of Study

The purpose of this study is to evaluate the safety and tolerability of ascending doses of ION582 administered intrathecally in participants with Angelman syndrome.


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Key Inclusion / Exclusion Criteria

Inclusion Criteria:

  • Participant has a documented and certified diagnosis of Angelman syndrome (AS) (ubiquitin-protein ligase E3A [UBE3A] deletion or UBE3A mutation)
  • Male or female between the ages of 2-50 years of age, with signed informed consent from parent(s) or legal guardian(s)
  • Currently receiving stable standard of care treatments such as, stable doses of anti-epileptic medication, behavioral management medications, sleep medications, gabapentin, cannabidiol, and including special diets, supplements or nutritional support for at least 3 months prior to first dose.
  • Follow good study practice and not participate in the sharing of personal or study information on social media platforms, such as any website or social media site (e.g., Facebook, Instagram, Twitter, YouTube, etc.) until notified that the study is completed.

Exclusion Criteria:

  • Has documented molecular AS confirmation of paternal uniparental disomy (UPD) or imprinting defect (ID).
  • Any clinically significant (CS) cardiovascular, endocrine, hepatic, renal, pulmonary, gastrointestinal, neurologic, malignant, metabolic, psychiatric, or other condition that, in the judgment of the Investigator, will pose a safety risk, will make the patient unsuitable for participation in, and/or unable to complete the study procedures. Has poorly controlled seizures as determined by the Investigator or has documented Status Epilepticus in the past 6 months that could pose a safety risk while on study.
  • Known bone, spine, bleeding, or other disorder that exposes the patient to risk of injury or unsuccessful lumbar puncture. Previous treatment with an oligonucleotide (including small interfering ribonucleic acid, antisense oligonucleotide [ASOs]). COVID-19 vaccinations are allowed.
  • Any prior use of gene therapy. Have any other conditions, which, in the opinion of the Investigator would make the participant unsuitable for inclusion or could interfere with the participant taking part in or completing the study.


Angelman Syndrome




Phase 1

Clinical Trials ID


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Start Date / End Date:

12 2021 - 01 2025


Part 1 MAD: Cohort A



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