Scientists Uncover Trigger for Fragile X Syndrome
A new study led by Weill Cornell Medical College scientists shows that Fragile X syndrome occurs because of a mechanism that shuts off the gene associated with the disease. The findings, published today in Science, also show that a compound that blocks this silencing mechanism can prevent Fragile X syndrome – suggesting a similar therapy may be possible for 20 other diseases that range from mental retardation to multisystem failure.
Small Molecules To Target r(CGG) Expansions to Treat Fragile X Syndrome
FRAXA-funded scientists created small molecules that target the CGG repeat “off-switch” in Fragile X, aiming to restore the missing FMRP protein at its source.
Translation-Independent Functions of FMRP in Excitability, Synaptic Transmission and Plasticity
Study pinpointed presynaptic calcium dysfunction as the driver of STP defects in Fragile X, and BK channel activation restored normal synaptic signaling.
Glycogen Synthase Kinase-3 (GSK3), Lithium and Fragile X
Dr. Jope found that lithium (at usual therapeutic doses) and investigational GSK3 inhibitors can reverse a number of cognitive deficits in FMR1 knockout mice.
Matrix Metalloproteinase Therapeutic Treatments for Fragile X Syndrome
Dr. Broadie showed that MMP enzymes disrupt synapse development in Fragile X. MMP inhibitors (e.g. minocycline) improved connectivity and behavior in fruit flies.
Endocannabinoid Mediated Synaptic Plasticity in Fragile X Mice
FRAXA-funded studies found faulty endocannabinoid signaling in Fragile X brain circuits for reward and emotion, and boosting 2-AG restored normal function.
Effects of minocycline on vocal production and auditory processing in a mouse model of Fragile X
With FRAXA funding, Dr. Khaleel Razak and Dr. Iryna Ethell explored robust biomarkers relevant to the FXS and the efficacy of minocycline treatment.
Preclinical Evaluation of Serotonin Receptor Agonists as Novel Pharmacological Tools in Fragile X Syndrome
With FRAXA funding the team found that activating 5-HT7 receptors reversed excess mGluR-LTD in Fragile X mice, pointing to a new route to fix synapses.
Small Rho GTPases, a Potential Therapeutic Target for Fragile X Syndrome
Dr. MariVi Tejada from the University of Houston tested several potential therapeutic compounds in an attempt to rescue function in the mouse model of Fragile X.
Ab-Mediated Translation in Fragile X Syndrome
This work found amyloid precursor protein (APP) overexpression and increased β-amyloid in Fragile X mice, implicating Alzheimer-related pathways in FXS pathology.
Role of JNK in FMRP Regulated Translation in Fragile X Syndrome
JNK kinase is abnormally active in Fragile X model mice and directly regulates mGluR-dependent translation of FMRP targets, pointing to JNK as a therapeutic target.
Serotonergic Rescue of Synaptic Plasticity in FMR1 Knockout Mice
Dr. Zhu examined how serotonin-targeting drugs such as Buspar and Abilify influence synaptic plasticity, including LTP and LTD.
Altered Dendritic Synthesis of Postsynaptic Scaffold Protein Shank1 in Fragile X Syndrome
Loss of FMRP leads to excess synthesis of the scaffold protein Shank1 at dendrites. Elevated Shank1 may impair synaptic pruning and drive Fragile X spine pathology.
Clinical Trials Outcome Measures
In Fragile X participants, low-dose lithium showed benefits and helped refine biomarkers and behavioral assessments.
Manipulating Basal and mGluR-Stimulated cAMP Level in FXS Model Mice
Fragile X mice show reduced basal cAMP and exaggerated mGluR-LTD; boosting cAMP or blocking specific adenylyl cyclases rescues synaptic and behavioral defects.
GABAergic Inhibitory Function in Fragile X Syndrome
Fragile X mice show weakened GABAergic inhibition in key brain regions like the amygdala. Enhancing GABA_A receptor activity reduced hyperactivity and improved inhibition.
Correcting Fragile X Syndrome by Inhibiting the Synaptic RNA-Binding Protein CPEB1
The Richter lab found that CPEB1 knockdown in Fmr1 KO mice normalized excessive protein synthesis and improved synaptic and memory problems tied to Fragile X.
The Slack Potassium Ion channel is a Therapeutic Target for Fragile X
With $282,000 in funding from FRAXA Research Foundation, Dr. Leonard Kaczmarek and colleagues explored association of Slack channels with the Fragile X protein (FMRP).
Pilot Clinical Trial of Lithium in Fragile X Shows Promising Results
With $65K from FRAXA, Dr. Berry-Kravis at Rush University ran a pilot lithium trial in 15 Fragile X patients. Results published.
Small Molecule Modulators of Lithium for Treatment of Fragile X Syndrome
With a $219,500 FRAXA grant, Dr. Stephen Haggarty at Harvard/MIT used patient-derived stem cells to screen drugs targeting GSK3, aiming to enhance lithium therapy.
Aberrant Behavior Checklist in Fragile X Syndrome
With a $10,000 FRAXA grant, Dr. David Hessl at UC Davis analyzed the Aberrant Behavior Checklist as a key outcome measure for Fragile X. Results were published.
Mouse Models of Fragile X Syndrome
With FRAXA support, Dr. Oostra’s team built the first Fragile X mouse model and published pivotal studies advancing the field.
3 Researchers Honored at FRAXA Investigators Meeting
Over 150 scientists from around the world gathered at FRAXA’s 2008 Investigators Meeting to share discoveries and speed treatments for Fragile X syndrome.
Altered Cyclic AMP Signaling in Fragile X
FRAXA-funded research by Dr. Anita Bhattacharyya at the Waisman Center revealed key insights into cyclic AMP signaling in Fragile X. Findings were published.