Here, we report a 37-year-old male Korean patient carrying a PSEN1 p.Gly417Ala mutation with exceptionally early and severe presentations, including a wide range of atypical symptoms of rapid cognitive decline with a stooped posture, rigidity, and bradykinesia.
The PSEN1 F177S mutation leads to typical AD starting at age 30 and a homogeneous phenotype with rapid cognitive decline and prominent neurological symptoms.