Ten novel mutations in the molybdenum cofactor genes MOCS1 and MOCS2 and in vitro characterization of a MOCS2 mutation that abolishes the binding ability of molybdopterin synthase

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• 作者：Silke Leimkühler ; Mathilde Charcosset ; Philippe Latour ; Claude Dorche ; Soledad Kleppe ; Fernando Scaglia ; Irmina Szymczak ; Petra Schupp ; Rita Hahnewald and Jochen Reiss
• 刊名：Human Genetics
• 出版年：2005
• 出版时间：October 2005
• 年：2005
• 卷：117
• 期：6
• 页码：565-570
• 全文大小：278 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Human Genetics
  Molecular Medicine
  Internal Medicine
  Metabolic Diseases
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1203

文摘

Molybdenum cofactor deficiency (MIM#252150) is a severe autosomal-recessive disorder with a devastating outcome. The cofactor is the product of a complex biosynthetic pathway involving four different genes (MOCS1, MOCS2, MOCS3 and GEPH). This disorder is caused almost exclusively by mutations in the MOCS1 or MOCS2 genes. Mutations affecting this biosynthetic pathway result in a lethal phenotype manifested by progressive neurological damage via the inactivation of the molybdenum cofactor-dependent enzyme, sulphite oxidase. Here we describe a total of ten novel disease-causing mutations in the MOCS1 and MOCS2 genes. Nine out of these ten mutations were classified as pathogenic in nature, since they create a stop codon, affect constitutive splice site positions, or change strictly conserved motifs. The tenth mutation abolishes the stop codon of the MOCS2B gene, thus elongating the corresponding protein. The mutation was expressed in vitro and was found to abolish the binding affinities of the large subunit of molybdopterin synthase (MOCS2B) for both precursor Z and the small subunit of molybdopterin synthase (MOCS2A).