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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1982 Mar;34(2):250–262.

Segregation and linkage studies of plasma dopamine-beta-hydroxylase (DBH), erythrocyte catechol-O-methyltransferase (COMT), and platelet monoamine oxidase (MAO): possible linkage between the ABO locus and a gene controlling DBH activity.

L R Goldin, E S Gershon, C R Lake, D L Murphy, M McGinniss, R S Sparkes
PMCID: PMC1685293  PMID: 6951409

Abstract

Measurements of dopamine-beta-hydroxylase (DBH), catechol-O-methyltransferase (COMT), and monoamine oxidase (MAO) along with 27 polymorphic marker phenotypes were available for 162 patients with major affective disorders and 1,125 of their relatives. Levels of enzymes were previously found not to be associated with illness. Pedigree analysis methods for quantitative traits are used to test single-gene hypotheses for segregation of DBH in 32 families with 411 individuals. COMT in 30 families with 351 individuals, and MAO in 50 families with 309 individuals. The familial distribution of both DBH and COMT are consistent with two codominant alleles at the same locus that account for 56% and 59% of the total variance, respectively. MAO activity cannot be shown to be segregating as a single major gene, but a purely nongenetic hypothesis is also rejected. A possible linkage of a locus for DBH to the ABO locus is indicated by a maximum lod score of 1.82 at 0% and 10% recombination fractions for males and females, respectively. A lod score of 0.61 at 0% recombination for a similar analysis in a single large pedigree was reported by Elston et al., making the combined lod score for the two studies equal to 2.32 at 0% recombination.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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