$QURE new gene therapy candidate AMT-150, a novel treatment for Spinocerebellar Ataxia Type 3, a central nervous system disorder.
Spinocerebellar Ataxia Type 3 (SCA3), also known as Machado-Joseph disease, is caused by a CAG-repeat expansion in the ATXN3 gene that results in an abnormal form of the protein ataxin-3. People with SCA3 experience brain degeneration that results in movement disorders, rigidity, muscular atrophy and paralysis. There is currently no treatment available that slows the progressive course of this lethal disease.
AMT-150 is a one-time, intrathecally-administered, AAV gene therapy incorporating the Company’s proprietary miQURE™ silencing technology that is designed to halt ataxia in early manifest SCA3 patients.
In an in-vitro study with human Induced Pluripotent Stem (IPS) derived neurons, AMT-150 has been shown to lower the human ataxin-3 protein by 65 percent, without any off-target effects. The Company also performed a proof-of-concept in-life study in SCA3 mice demonstrating that AMT-150 was able to lower toxic ataxin-3 protein by 65 percent in the brain stem after a single administration. Further studies in non-human primates demonstrate the ability to distribute and express a reporter gene at a clinically relevant level in the most degenerated brain regions in SCA3.
These preclinical studies show that a single administration of AMT-150 results in sustained expression and efficient processing with on-target engagement. They also show that AMT-150 appears to be safe due to the lack of off-target activity. The Company is currently performing studies in large animals to demonstrate further safety and efficacy.