Nucleotide sequence analysis of the binding site on the inositol 1,4,5-trisphosphate type-1 receptor in bipolar disorder -- a negative study.

Pharmacological studies of bipolar disorder suggest that dysfunction of calcium mobilization via phosphatidylinositol-mediated transduction may be involved in its pathogenesis. The present study tests the hypothesis that dysfunction of calcium mobilization in bipolar disorder is due to the mutation of the nucleotide sequence in the FKBP12 binding site on the inositol 1,4,5-trisphosphate type-1 receptor (IP3R1). Nucleotide sequence analysis of the FKBP12 binding site on IP3R1 was performed using reverse transcription-polymerase chain reaction and DNA sequencing. The nucleotide sequence in this region was preserved in all subjects. This finding suggests that IP3R1 dysfunction through the FKBP12 binding site is not involved in the pathogenesis of bipolar disorder.