FRAXA Drug Validation Initiative (FRAXA-DVI)

The FRAXA Drug Validation Initiative (FRAXA-DVI) provides speedy, cost-effective, objective preclinical testing to validate investigational and repurposed compounds for Fragile X.

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Dr. Gary Feldman, Principal Investigator for the MRM-3379 Phase 2 clinical trial at the Irvine, California site, standing with an individual with Fragile X syndrome.

Recruiting: Mirum Launches Clinical Trial of MRM-3379 for Fragile X Syndrome

Mirum’s MRM-3379 Phase 2 trial builds on FRAXA-funded PDE4D research and is now enrolling males ages 13–45 with Fragile X syndrome. View eligibility and study sites.

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FRAXA Q&A Webinar with Dr. Elizabeth Berry-Kravis on the Harmony RECONNECT Trial

Fragile X Research Q&A: Dr. Berry-Kravis on the RECONNECT Trial

Fragile X Research Q&A with Dr. Berry-Kravis on RECONNECT results, placebo effects, outcome measures, methylation, and research directions for families.

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Metabolic and Mitochondrial Crosstalk in Insulin and cAMP Pathways in Fragile X Syndrome

Fragile X syndrome research explores insulin and cAMP pathway crosstalk, mapping brain metabolism to guide treatment strategies.

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Dr. Thomas Maurin and Dr. Barbara Bardoni, Fragile X researchers and co-authors of a 2025 review on PDE inhibitors published in Cell Reports Medicine.

Fragile X and PDE Inhibitors: A Promising Path Forward for Brain Disorders

Fragile X syndrome research shows PDE inhibitors may improve brain function and behavior, with promise for related neurodevelopmental disorders.

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Fragile X Clinical Trial of New PDE4D Inhibitor from Tetra

A $200K FRAXA grant enabled a successful Phase 2 trial of a PDE4D inhibitor for adult men with Fragile X, showing strong cognitive gains without side effects or tolerance.

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Tetra’s Fragile X Clinical Trial – The Most Successful So Far

Dr. Mark Gurney of Tetra Therapeutics, discusses how one of the earliest clues to the biology of Fragile X led to the most successful Fragile X clinical trial to date: a phase 2 trial of a PDE4D inhibitor.

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Tetra Releases Full Results of FRAXA-Funded Clinical Trial of PDE4D Inhibitor

Today, Tetra Therapeutics published the full results of its PDE4D trial. The data from this phase 2 clinical trial suggests the PDE4D drug can improve intellectual disability in Fragile X syndrome.

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Clinical Trials and Cyclic AMP in Fragile X Syndrome: A Life Journey

In this Simons Foundation lecture, Elizabeth Berry-Kravis traces 30 years of Fragile X research, from identifying its cause through a series of disappointing clinical trials.

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Positive Results Reported in Phase II Fragile X Clinical Trial of PDE4D Inhibitor Zatolmilast from Tetra Therapeutics

Tetra Therapeutics announces the first unequivocally positive phase 2 clinical trial in Fragile X syndrome. The results do not depend on carving out a subset of patients or post hoc analysis.

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Companies Move to Advance Potential Cognitive Treatment for Fragile X

Tetra Therapeutics and Shionogi announced plans to expand their partnership supporting BPN14770, a treatment candidate for disorders marked by cognitive and memory deficits.

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Should You Participate in a Fragile X Clinical Trial?

A Fragile X clinical trial of a new PDE4D allosteric inhibitor from Tetra Therapeutics is nearly complete. The drug has a unique mechanism of action that might improve cognitive and memory function.  

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Screening 2,320 FDA-Approved Drugs for Potential Treatment of Fragile X

FRAXA funded a screen of 2,320 FDA-approved compounds in the Fragile X fly model to identify hits that improve memory and social behavior for advanced testing.

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Tetra Announces $40M to Advance BPN14770 for FXS and Alzheimer’s Disease

Tetra conducted a Phase 2 study of BPN14770 in adults with Fragile X Syndrome. This clinical trial was made possible by early work with the FRAXA-DVI and over $200,000 from FRAXA.

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Dr. Thomas Maurin and Dr. Barbara Bardoni, Fragile X researchers and co-authors of a 2025 review on PDE inhibitors published in Cell Reports Medicine.

Research Points to Drugs which Inhibit PDE to Treat Fragile X

FRAXA-funded work identified PDE enzymes as key targets in Fragile X, showing that PDE inhibitors can fix signaling and boost synaptic function. PDE4D trials are underway.

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Tetra Discovery Partners

Tetra Discovery Partners Initiates Phase 2 Trial of BPN14770 in Fragile X Syndrome

This 2-Period Crossover Study of BPN14770 is accepting adults males with Fragile X syndrome at Rush University Medical Center in Chicago. Principal Investigator of the study is Elizabeth Berry-Kravis, MD, PhD.
A selective inhibitor of the phosphodiesterase type-4D (PDE4D), BPN14770 has shown the ability to improve the quality of connections between neurons and to improve multiple behavioral outcomes in the Fragile X mouse model.

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Peter Vanderklish, PhD, at Scripps Research Institute, FRAXA research grant

Targeting AMP-Activated Protein Kinase Pathway in Fragile X Syndrome

With this grant from FRAXA, Dr. Peter Vanderklish explored AMPK activators to treat Fragile X. Both metformin and resveratrol, found in red wine, are AMPK activators.

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FRAXA Funded Research

Current Research Grants (37)