Nat Genet:口臭为何会产生?

2017-12-24 栗茂腾 科学网

口臭是如何产生的?全球约有10%~65%的人曾患有口臭,很大比例是由于患有口腔疾病的人口腔内容易滋生细菌,其分解产物中含有硫化物而导致口臭。但仍有部分人群找不到任何产生口臭的原因。近日,Nature Genetics杂志发表文章(Mutations in SELENBP1, encoding a novel human methanethiol oxidase, cause extraoral h

口臭是如何产生的?全球约有10%~65%的人曾患有口臭,很大比例是由于患有口腔疾病的人口腔内容易滋生细菌,其分解产物中含有硫化物而导致口臭。但仍有部分人群找不到任何产生口臭的原因。近日,Nature Genetics杂志发表文章(Mutations in SELENBP1, encoding a novel human methanethiol oxidase, cause extraoral halitosis),作者通过对家族慢性口臭人群的研究,结合遗传学研究结果,作者认为Selenium-bindingprotein 1 (SELENBP1)基因的突变是导致慢性口臭的遗传原因。

研究人员通过对来自不同家族患有口臭且口气呈现烂白菜味道的个人发现:患有家族慢性口臭的人群从鼻孔和嘴巴呼出的气体中含有大量甲硫醇,甲硫醇有烂白菜味道的气体。甲硫醇在正常情况可被体内分解代谢从而使异味消除。作者推测病人含硫化合物合成途径上某些基因缺陷会导致甲硫醇的积累,同时通过替代的代谢途径进而生成二甲基硫(Dimethyl sulfide,DMS)、二甲亚砜(Dimethyl sulfoxide,DMSO)、二甲基砜(Dimethyl sulfone,DMSO2)等大量硫基化合物。

由于一些细菌也能分解硫化合物,研究人员通过比较基因组分析在人类中找到了和细菌中硫代谢相关基因的同源基因--硒结合蛋白1(selenium binding protein 1,SELENBP1),SELENBP1有将甲硫醇转化为其他化合物的功能,从而使异味消失。在患者血液中检测到了高水平的甲硫醇和二甲基硫(dimethyl sulfide),带有这些有气味的硫化物扩散入肺,呼气时由于这些硫化物排出导致了口臭。研究人员在老鼠中敲除SELENBP1基因,结果在老鼠的血液中检测到DMS的含量的提高,这进一步证实了该基因的功能。

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    2018-04-25 cy0324
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    2018-05-25 liye789132251
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    2018-01-22 canlab
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    2017-12-24 明月清辉

    谢谢分享.学习了

    0

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    2017-12-24 lovetcm

    这个研究很有意思

    0

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