Early psychiatrics symptoms in familial Alzheimer's disease with presenilin 1 mutation (I83T).

Several clinical phenotypes were associated with presenilin 1 (PSEN1) mutation in early-onset familial Alzheimer's disease (EOFAD). We report the clinical phenotype of two members of a familial dementia kindred who presented with EOFAD and early psychiatric syndrome as behavioral abnormalities. Sequence analysis of the index patient and his brother's PSEN1 transcript revealed a novel T > C transition in exon 4 which was determined as a missense substitution at position 248 of the coding sequence (cDNA. 248T > C).