Abstract
Twin, family and adoption studies have indicated that genetic susceptibility plays an important role in the etiology of bipolar disorder. Turecki et al. (1998) recently published preliminary evidence suggesting that bipolar patients with an excellent response to lithium treatment have a higher frequency of a specific dinucleotide repeat allele in the phospholipase Cgamma-1 (PLCG1) genomic region. The present work was undertaken to re-examine the finding by Turecki et al. in a sample of Norwegian lithium-treated bipolar patients sub-classified as lithium responders, non-responders, or partial responders/unclassified. The overall distribution of the PLCG1 dinucleotide repeat alleles was not significantly different between different categories of subjects. When analyzed according to presence or absence of different dinucleotide alleles, a PLCG1-8 repeat was more frequent among lithium responders vs controls. In line with Turecki et al., we also noticed a moderately over-representation of the PLCG1-5 repeat among the bipolar patients as compared to the controls.
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