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Molecular genetics and characterisation of functional methionine synthase deficiency: Mutation analysis and gene cloning.

机译:功能性蛋氨酸合酶缺乏症的分子遗传学和表征:突变分析和基因克隆。

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摘要

Methionine synthase (MS) is a vitamin B12(cobalamin;cbl) dependent enzyme that catalyses the methylation of homocysteine to methionine. It uses methyl-cbl as coenzyme and in ethyl tetrahydrofolate as the methyl donor. Methionine sythase reductase (MSR) maintains MS in it active state using S-adenosyl methionine as the methyl donor. Functional MS deficiency may occur as a result of a defect in either enzyme. Patients with this disorder have been classified into two complemetation groups according to which protein is defective: cblG patients are deficient in MS and cblE patients in MSR. A subset of cblG, known as cblG variant, is unique in showing barely detectable MS activity and failure of cbl incorporation into MS in patient fibroblasts. I report the mutations responsible for three cblG variant patients, two of them siblings, and connect their phenotype to lack of protein expression. I also report the cloning of the MSR cDNA, aided by confirming the identity of the cDNA through the discovery of two deleterious mutations in three cblE patients. These findings contribute to the overall understanding of functional MS deficiency.
机译:蛋氨酸合酶(MS)是一种维生素B12(钴胺素; cbl)依赖性酶,可催化高半胱氨酸甲基化为蛋氨酸。它使用甲基-cbl作为辅酶,并使用四氢叶酸乙酯作为甲基供体。甲硫氨酸合酶还原酶(MSR)使用S-腺苷甲硫氨酸作为甲基供体将MS保持在活性状态。两种酶中的一种缺陷可能导致功能性MS缺乏。根据这种蛋白质的缺陷,患有该疾病的患者已分为两个补充组:cblG患者缺乏MS,cblE患者缺乏MSR。 cblG的一个子集(称为cblG变体)在显示几乎无法检测到的MS活性以及患者成纤维细胞中将cbl掺入MS的失败方面是独特的。我报告了负责三名cblG变异患者的突变,其中两名是兄弟姐妹,并将其表型与缺乏蛋白表达联系起来。我还报告了MSR cDNA的克隆,通过在三名cblE患者中发现两个有害突变来确认cDNA的身份。这些发现有助于全面了解功能性MS缺乏症。

著录项

  • 作者

    Wilson, Aaron W.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Biology Genetics.; Biology Molecular.
  • 学位 M.Sc.
  • 年度 1999
  • 页码 100 p.
  • 总页数 100
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遗传学;分子遗传学;
  • 关键词

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