Optical Imaging as a Tool for Monitoring Brain Function in Fragile X Syndrome

Phase

N/A

Condition

Fragile X Syndrome

Treatment

N/A

Clinical Study ID

NCT06293027

IMAGINER FXS

Ages > 2
Male
Accepts Healthy Volunteers

Study Summary

The objective of this project is to explore the potential of functional near- infrared spectroscopy (fNIRS) as innovative functional biomarker for clinical trial readiness in Fragile X Syndrome (FXS) that is still without cure. The limited availability of objective and quantitative biomarkers to monitor brain function poses challenges to advancing therapeutic research. With clinical trials on the horizon, the need for precise measurement to evaluate treatment efficacy is pressing. The investigators seek to address this gap by assessing the prognostic reliability of both resting and task- evoked fNIRS. The primary objectives of this pilot study are: 1. to determine the feasibility of fNIRS in individuals with FXS; 2. to collect pilot data on individuals with FXS to determine the patterns of cerebral oxygen consumption as measured by fNIRS; 3. to compare cerebral oxygen consumption changes at rest and from visual/auditory tasks in affected individuals versus age-appropriate healthy volunteers. The secondary objectives of this study are: 1. to correlate cerebral oxygen consumption changes from visual/auditory task in affected individuals to other measures of disease state (e.g., neuropsychological assessment, disease- specific severity rating scales); 2. to examine test-retest reliability of our fNIRS measures in both affected individuals and healthy controls.

Eligibility Criteria

Inclusion

Inclusion Criteria: FXS participants:

Age criteria: Between ages 2 years to 50 years old, inclusive at time of enrollment
Diagnosed with FXS with a previously identified pathogenic or likely pathogenicvariant in the FMR1 gene.
Must also meet the diagnostic criteria for FXS.
Male Typically developing participants:
Age criteria: Between ages 2 years to 50 years old, inclusive at time of enrollment
Age- and sex-matched to the FXS participants
No underlying genetic diagnosis or past/chronic medical condition associated withincreased risk for autism spectrum disorder (ASD) and/or ID
Typical neurodevelopment for age (no established diagnosis or clinical suspicion forASD or ID)

Exclusion

Exclusion Criteria: For FXS and Typically developing participants:

Unwilling or unable to comply with study procedures and assessments
Contraindications to fNIRS, such as uncooperative or destructive behaviors preventinglead placement or capture by fNIRS equipment
Traumatic loss of consciousness in the last year
Has taken an investigational drug as part of another research study, within 30 daysprior to study enrollment
If participant is judged by the PI or Sub-I to be inappropriate for the study for anyreason For Typically developing participants:
Known or suspected cognitive impairment
Known history of MRI abnormality
Current use of psychotropic medications

Study Design

June 01, 2023

December 15, 2025

Study Description

This is a non-profit study of a cohort of patients with genetically determined Fragile X Syndrome and age-matched healthy controls. The design of the study is observational, case-control. An imaging session using fNIRS (NIRSport2, NIRx Technologies) will be conducted during the visits scheduled for the individual participants. Participants will be assessed for optimal placement of the fNIRS probe on the head through measurement of the fiducial points on the scalp. With the NIRx NIRSPort2 system, the near- infrared sources and detectors are situated in a fabric cap resembling a swim cap that is applied like a hat and secured in place by a velcro chin strap.

Once the probe is placed, fNIRS will be measured during a passive viewing/ listening task administered on a computer. The montage consists of 8 red light-sources operating at 760 nm and 850 nm, and 7 detectors which can be easily placed into a textile EEG cap (EASYCAP, Herrsching, Germany, size according to head circumference). The systems that are utilized have been selected to be very child-friendly systems, involving no cleaning or abrasion of the scalp preparation and rapid application. Application procedures have been designed to minimize any discomfort to the participant. In total, these measurements should take 30-40 minutes to complete (including application of the NIRS cap). Alongside fNIRS, neuropsychological assessments of affected individuals patients will be conducted. The following outcome measures will be collected assessing: i) cognitive performance (Leiter International Performance Scale, 3rd edition, PPVT-5, simple reasoning tasks on tablets and Vineland Adaptive Behaviour Scale); ii) behavioural disorder (BASC-3, ABC-2 scales and BRIEF); iii) autistic-like features (SRS-2 and PPD- MRS). The cognitive tasks were chosen to be adapted to the cognitive deficit of affected individuals. A task on tablets with minimal verbal instruction will allow to assess reasoning abilities in severe to moderate ID patients that could not perform classical Wechsler scale (IQ test). Healthy controls will be asked to return 8-12 weeks post their initial visit to undergo repeat fNIRS testing for the purposes of examining test-retest reliability of the fNIRS measurement. If their schedule allows, affected individuals will also undergo repeat fNIRS testing. fNIRS is safe, non-invasive and generally well tolerated. The information obtained from this study will help identify outcome measures for drug testing in future therapeutic trials.

Connect with a study center

IRCCS Fondazione Stella Maris
Marina di Pisa-Tirrenia-Calambrone, Toscana 56128
Italy
Active - Recruiting

Not the study for you?

Let us help you find the best match. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.