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  • Title: Evidence for a genetic association between alleles of monoamine oxidase A gene and bipolar affective disorder.
    Author: Lim LC, Powell J, Sham P, Castle D, Hunt N, Murray R, Gill M.
    Journal: Am J Med Genet; 1995 Aug 14; 60(4):325-31. PubMed ID: 7485270.
    Abstract:
    We present evidence of a genetic association between bipolar disorder and alleles at 3 monoamine oxidase A (MAOA) markers, but not with alleles of a monoamine oxidase B (MAOB) polymorphism. The 3 MAOA markers, including one associated with low MAOA activity, show strong allelic association with each other but surprisingly not with MAOB. Our results are significant only for females, though the number of males in our sample is too small to draw any definite conclusions. Our data is consistent with recent reports of reduced MAOA activity in patients with abnormal behavioral phenotypes. The strength of the association is weak, but significant, which suggests that alleles at the MAOA locus contribute to susceptibility to bipolar disorder rather than being a major determinant.
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