Extraoral halitosis due to MTO deficiency

Definition:

Extraoral halitosis due to MTO deficiency (EHMTO) is a novel inborn error of metabolism. Mutations in SELENBP1 in patients with cabbage-like breath odor have been identified. The malodor was attributable to high levels of methanethiol and dimethylsulfide in their breath. SELENBP1 has been identified as the human methanethiol oxidase (MTO) catalyzing the conversion of methanethiol into formaldehyde, H2S, and hydrogen peroxide.

References:

[1]. Arjan Pol, et al. Mutations in SELENBP1, encoding a novel human methanethiol oxidase, cause extraoral halitosis. Nat Genet. 2018 Jan;50(1):120-129. [Content Brief]

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