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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Physiological factors affecting protein expression of flavin-containing monooxygenases 1, 3 and 5.

1. The mouse and rat exhibit substantial differences in the gender expression of flavin-containing monooxygenase ( FMO) forms. Hepatic FMO1 is gender-dependent in both species, selective to the male in rat, female in mouse. Human FMO1 is nearly undetectable. FMO3 in mouse is gender-specific to the female, but gender-independent in rat and man. FMO5 is gender-independent for mouse, rat and man. 2. Gender differences in substrate metabolism do not reflect overall FMO or isoform differences. Methimazole, imipramine and thiobenzamide are much better substrates for FMO1 than for FMO3 or FMO5. 3. Activities of microsomal samples toward these substrates reflect the relative abundance of FMO1. Hepatic samples show a 3-fold greater activity toward methimazole in the female mouse and male rat. Human microsomal samples show minimal activity. 4. Developmentally, FMO1 and FMO5 are expressed in foetuses as early as gestation days 15 and 17 and equally between genders until puberty. FMO3 is not found until 2 weeks post-partum and is found equally in the male and female until 6 weeks post-partum when it becomes undetectable in the male. 5. An event takes place after birth but before puberty that confers the ability to produce FMO3. The developmental pattern observed for mouse FMO3 is similar to human FMO3.[1]


  1. Physiological factors affecting protein expression of flavin-containing monooxygenases 1, 3 and 5. Cherrington, N.J., Cao, Y., Cherrington, J.W., Rose, R.L., Hodgson, E. Xenobiotica (1998) [Pubmed]
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