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Variably Protease-Sensitive Prionopathy

By Pierluigi Gambetti, MD, Professor of Pathology, Case Western Reserve University

Variably protease-sensitive prionopathy is a prion disease that causes changes in mood and behavior, problems speaking, and impaired mental function.

Variably protease-sensitive prionopathy was identified in 2008. It accounts for about 3% of all prion diseases in people and affects about 2 to 3 of every 100 million people. It typically develops around age 70, and life expectancy is about 24 months after symptoms develop.

Researchers have not identified any gene mutation that causes this disease.

At first, people usually have changes in mood and behavior. They may lose their inhibitions, have intense feelings of well-being (euphoria), lose interest in their usual activities, or become listless. They may have problems speaking and may become uncoordinated. Mental function is impaired. Walking eventually becomes difficult.

This prion disease is especially difficult to diagnose and is often mistaken for another dementia.

There is no effective treatment.