Tianasen (ASO-GNAO1) for GNAO1-Encephalopathy With Epilepsy and Movement Disorders.

Pirogov Russian National Research Medical University

Status and phase: Enrolling; Phase 2; Phase 1

Conditions: Epilepsy; GNAO1; Hyperkinesis

Treatments: Biological: Antisense oligonucleotide treatment (ASO)

Study type: Interventional

Funder types: Other

Identifiers

NCT07363603

ASO-GNAO1

Details and patient eligibility

About

The goal of this clinical trial is to evaluate the efficacy and safety of the investigational drug ASO-GNAO1 (Tianasen) in pediatric patients with c.607G>A mutation in the GNAO1 gene associated with epilepsy and neurodevelopmental disorder. The main questions it aims to answer are:

1. Does intrathecal administration of ASO-GNAO1 slow or halt the progression of motor and cognitive symptoms?
2. Is ASO-GNAO1 safe and well-tolerated in this patient population?
3. What is the appropriate therapeutic dose?

This is an open-label study without a placebo control group due to the rare and severe nature of the disease. All participants will receive the active drug.

Participants will:

Receive escalating doses of ASO-GNAO1 via intrathecal injection over a 12-month period.

Undergo frequent neurological assessments, biomarker testing, and safety monitoring.

Full description

The variant c.607G>A in the GNAO1 gene is a gain-of-function (GOF) mutation associated with epilepsy and neurodevelopmental disorder.

ASO-GNAO1 (Tianasen) is an investigational antisense oligonucleotide (ASO) therapy designed for the treatment of GNAO1-encephalopathy. Its mechanism of action is allele-specific suppression of the mutant GNAO1 protein expression at the mRNA level. The compound mediates the degradation of mutant mRNA or inhibits its translation, thereby halting the synthesis of the pathogenic protein implicated in disease progression. This targeted suppression is anticipated to mitigate neurodegenerative processes and facilitate partial or complete restoration of neuronal function.

The drug candidate was identified through a screening platform analogous to that used for the development of Milasen, an FDA-authorized personalized ASO therapy for Batten disease. In vitro studies have demonstrated that ASO-GNAO1 (Tianasen) achieves approximately 85% suppression of the mutant GNAO1 allele activity (c.607G>A mutation) while showing no significant effect on the wild-type allele, confirming its allele-specificity.

Background and Rationale. GNAO1 encephalopathy is a severe, debilitating monogenic neurodevelopmental disorder of childhood onset, characterized by progressive motor dysfunction and drug-resistant epilepsy and hyperkinesis. Currently, there are no approved disease-modifying therapies, and management is limited to palliative and symptomatic care. The disease course is progressive, leading to severe developmental delay, profound disability, and premature mortality.

The rationale for this first-in-human study is to evaluate the potential of ASO-GNAO1 (Tianasen) to alter the natural history of the disease in a population with no alternative effective treatment options.

Study Design and Preclinical Rationale. This study constitutes the first human administration of ASO-GNAO1 (Tianasen). It is initiated as an investigational personalized therapeutic development effort for children with a rare monogenic mutation.

The preclinical toxicology program supporting this trial included single- and repeat-dose toxicity studies in rats. Doses were administered at three levels (0.2 mg/kg, 0.5 mg/kg, and 1.0 mg/kg) via intrathecal bolus injection five times over a 12-week period. The maximum observation period in the repeat-dose toxicity study was 141 days (20 weeks). The established No Observed Adverse Effect Level (NOAEL) and the overall design of the abbreviated preclinical package are consistent with the regulatory precedent set by other personalized ASOs, such as Milasen, which was authorized for a single-patient Investigational New Drug (IND) application.

Rationale for Dose Selection. The starting dose and escalation regimen for this study are based on an integrated analysis of the preclinical toxicology data, including the determination of the NOAEL and the estimated maximum tolerated dose. Further justification is derived from the known pharmacokinetic and pharmacodynamic profiles of structurally and mechanistically similar ASO compounds approved for intrathecal administration in neurological diseases, notably nusinersen and the personalized therapy milasen. Dosing is designed to remain within the established safety margins while targeting concentrations anticipated to be therapeutic based on preclinical efficacy models

Enrollment: 5 estimated patients

Sex: All

Ages: 1 to 14 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Informed Consent: Written informed consent from the parent(s) or legal guardian(s) of the patient and the child's assent (where applicable based on age and cognitive ability), obtained prior to the initiation of any study-related procedures.

• Age: Male or female children aged 1 year and older (≥1 year) until 14 years at the time of informed consent signing.

• Diagnosis: A confirmed a c.607G>A variant in of GNAO1 gene based on genetic testing, and a clinical presentation that includes both epilepsy and movement disorders.

• Treatment Resistance:

  • For seizures: Documented resistance to antiseizure medications prior to screening, defined as the persistence of seizures despite adequate trials of at least two appropriately dosed antiseizure medications.
  • For non-epileptic hyperkinesias/dystonia: Documented resistance to anti-hyperkinetic medications prior to screening, defined as the persistence of debilitating hyperkinesias or dystonic attacks despite adequate trials of at least two appropriately dosed anti-hyperkinetic medications.

• Contraception (for females of reproductive potential): For post- menarche female adolescents, a negative serum or urine pregnancy test at screening and agreement to use highly effective methods of contraception (e.g., hormonal implants, combined oral contraceptives, intrauterine device) throughout the study participation period.

Exclusion criteria

• Unacceptable Risk: Any concurrent severe medical, neurological, or psychiatric condition, or any other significant circumstance (e.g., unstable clinical status) that, in the judgment of the Investigator, could significantly increase the risk associated with study participation or the administration of the investigational product, or could interfere with the interpretation of study results.
• Impossibility of Intervention: Any anatomical abnormality, coagulation disorder, active infection, or other condition that constitutes a contraindication to or precludes the safe performance of repeated lumbar punctures for intrathecal administration of the study drug.
• Pregnancy or Lactation: Pregnancy, lactation, or intention to become pregnant during the study period.
• Concurrent Experimental Therapy: Receipt of any other investigational drug, device, or biological product within 1 month prior to screening or within a period of at least 5 half-lives of that product (whichever is longer).
• Protocol Compliance: Any other disease, condition, or behavioral factor that, in the opinion of the Investigator, could compromise the patient's safety, preclude adherence to the protocol schedule, or interfere with the study conduct and endpoint assessments. Age: 14 years and older

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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5 participants in 1 patient group

GNAO1 c.607G>A carriers

Experimental group

Description:

Patients enrolled based on the screening results will receive intrathecal administration of the ASO drug Tianasen, starting with a minimum initial dose of 0.3 mg/kg. The drug dose will be escalated every 2 weeks until the expected therapeutic dose of 1.2 mg/kg is reached. With good tolerability, the dose may be further increased to 1.5 mg/kg. Upon reaching the final dose level, an interim analysis of the results from the dose escalation period (including PK, efficacy, and safety assessments) will be conducted. Based on the results of this analysis, a decision will be made regarding the continuation of the study using the achieved dose. The study may be terminated prematurely if the risk-benefit ratio is deemed unfavorable.

Treatment:

Biological: Antisense oligonucleotide treatment (ASO)