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"Presenilin 1" (PSEN1) gene mutations are the major known genetic cause of early-onset Alzheimer's disease. Herein, we report a novel heterozygous PSEN1 mutation (p.Leu424Pro) in a Turkish patient presenting with deterioration of short-term memory and visuospatial skills starting at the age of 47 years. This novel mutation is located in the conserved residue of transmembrane domain 8 coded by exon 12. At the protein level, this mutation caused a disruption in the alpha helix structure of PSEN1. The structural and possible functional consequences of the mutation suggest that it has probably a pathogenic effect, which in turns had a potential role in the development of Alzheimer's disease in our patient. • We identified a novel presenilin 1 mutation in a patient with early-onset Alzheimer's disease. • The mutation is located in a highly conserved residue of the transmembrane domain 8 of presenilin 1. • In silico analyses at protein level supported the pathogenicity of the mutation. • We believe that our results will add valuable contribution to genetic basis of Alzheimer's disease. [ABSTRACT FROM AUTHOR]