An Open-label, Single Center, Single Participant Study of an Experimental Antisense Oligonucleotide Treatment for TUBB4A-related Leukodystrophy (ASOTUBB4A)

October 27, 2025 updated by: Olivia Kim-McManus, University of California, San Diego
This current study is aimed for the treatment of an individual participant with a form of TUBB4A-related leukodystrophy with hypomyelination.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

The study is an investigational interventional drug created for the study subject's specific pathogenic genetic mutation.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
1

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • San Diego, California, United States, 92123
        • Rady Children's Hospital San Diego

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

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
  • 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 enrollment
  • Participant has any condition that in the opinion of the Site Investigator, would ultimately prevent the completion of study procedures.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Open label
Drug: nL-TUBB4-001
Personalized antisense oligonucleotide

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Dystonia and gross motor function as measured by Barry Albright Dystonia Scale (BAD)
Time Frame: baseline to 12 and 24 months
The Barry Albright Dystonia Scale (BAD) is a clinical tool designed to evaluate the severity of dystonia in children. This scale assesses dystonia in eight different body regions including the eyes, mouth, neck, trunk, and each of the four limbs. Each region is scored on a severity scale from 0 (no dystonia) to 4 (severe dystonia), allow for quantification of the overall dystonia as well as distribution of dystonic movements across the body. The BAD will be performed at each study timepoint as specified by SoA by the same trained and qualified administrator.
baseline to 12 and 24 months
Dystonia and gross motor function as measured by Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS)
Time Frame: baseline to 12 and 24 months
The Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS) assesses the severity of dystonia as well as its impact on daily life. It consists of two main components: the Movement Scale, which scores dystonia in various body regions such as the eyes, mouth, neck, trunk, and limbs on a scale from 0 (no dystonia) to 4 (severe dystonia), and the Disability Scale, which evaluates the impact of dystonia on daily activities (e.g., feeding, hygiene, dressing, etc.).
baseline to 12 and 24 months
Dystonia and gross motor function as measured by Gross Motor Function Measure-88 (GMFM-88)
Time Frame: baseline to 12 and 24 months
The Gross Motor Function Measure-88 (GMFM-88) evaluates changes in gross motor function in children with conditions that affect gross motor abilities. Motor function is assessed through 88 tasks across five dimensions: lying and rolling, sitting, crawling, and kneeling, standing, and walking, running, and jumping. Each item is scored on a four-point ordinal scale based on observed performance, providing quantification of gross motor function and the ability to track progress or regression over time.
baseline to 12 and 24 months
Dystonia and gross motor function as measured by Vineland Adaptive Behavior Scales
Time Frame: baseline to 12 and 24 months
The Vineland Adaptive Behavior Scales, Third Edition (Vineland-3), is a standardized, validated, and reliable assessment tool designed to measure the adaptive behavior of individuals from birth through adulthood. The Vineland-3 Motor Skills domain evaluates gross and fine motor abilities in individuals from birth to age 9, offering insights into coordination, balance, mobility, and dexterity. The raw scores are converted to standard scores and growth scale value scores, with higher scores indicating better adaptive functioning.
baseline to 12 and 24 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Communication, behavioral and cognitive skills measured by The Vineland Adaptive Behavior Scales
Time Frame: baseline to 12 and 24 months
The Vineland Adaptive Behavior Scales, Third Edition (Vineland-3), is a standardized, validated, and reliable assessment tool designed to measure the adaptive behavior of individuals from birth through adulthood. The Vineland-3 Motor Skills domain evaluates gross and fine motor abilities in individuals from birth to age 9, offering insights into coordination, balance, mobility, and dexterity. The raw scores are converted to standard scores and growth scale value scores, with higher scores indicating better adaptive functioning.
baseline to 12 and 24 months
Communication, behavioral and cognitive skills measured bythe Bayley Scales of Infant and Toddler Development 4th Edition (BSID-4)
Time Frame: baseline to 12 and 24 months
The Bayley Scales of Infant and Toddler Development is a standardized, validated, and reliable assessment tool for evaluating developmental functioning in infants and toddlers. Its Motor Skills domain evaluates gross and fine motor abilities, including coordination, balance, and movement. The raw scores are converted to standard scores and growth scale value scores, with higher scores indicating better motor development.
baseline to 12 and 24 months
Quality of life as measured by PedsQL Family Impact Module
Time Frame: baseline to 6-, 12-, 18-, and 24-months
The Pediatric Quality of Life Inventory (PedsQL) Family Impact Module is a multidimensional instrument developed to assess the impact of chronic medical conditions on the health-related quality of life of parents and family functioning. This module measures parents' self-reported physical, emotional, social, and cognitive functioning, communication, and worry. The PedsQL Family Impact Module has shown reliability and validity in families with children with complex chronic health conditions.
baseline to 6-, 12-, 18-, and 24-months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of California, San Diego

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
September 19, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 27, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 27, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 29, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 29, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 27, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 812067

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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