Scientists at the Hotchkiss Brain Institute (HBI), Alberta Children’s Hospital Research Institute (ACHRI), and Owerko Centre at UCalgary’s Cumming School of Medicine (CSM) have made a breakthrough discovery that could lead to treatment of Fragile X syndrome (FXS), the leading genetic cause of Autism. The study, involving mouse models, shows promise of translating to treatment for people diagnosed with FXS.
FXS causes intellectual disabilities and hyperactive behaviour, usually more commonly seen in males than females. Children and adults with FXS are missing a protein vital to brain development called FMRP. Among other functions, FMRP helps develop synapses between neurons in the brain.
Dr. Raymond W. Turner, PhD, and members of his study team including Drs. Xiaoqin Zhan, PhD, Hadhimulya Asmara, PhD, and Ning Cheng, PhD, made the discovery while studying ion channels in the brain – special proteins that conduct currents through cells, enabling communication within the brain.
“If I had to make an analogy, it might be akin to insulin and diabetes. With FXS, individuals are missing this protein – let’s try putting it back in,” says Turner, study lead, and professor in the departments of Cell Biology & Anatomy, and Physiology & Pharmacology at the CSM. “In 30 minutes, the protein distributed throughout the brain, and accomplished what it’s supposed to do at the single-cell level.”
Unlike injected insulin, which helps someone with diabetes control their blood sugar for a few hours, the FMRP injection helps restore protein levels in the cerebellum and brain for up to one day after the injection. “Hyperactivity was reduced for almost 24 hours,” says Zhan, a postdoctoral scholar in the Turner lab. “We did one injection and we tested for it one day later, and three key proteins that are known to be in Fragile X were still at restored normal levels.”
