3 -甲基巴豆酰辅酶A羧化酶缺乏症( 3 - methylcrotonyl-coenzyme A carboxylase deficiency , MCCD ) (又称3 -甲基巴豆酰甘氨酸尿)是由于基因MCCC1及MCCC2突变所致。MCCC1突变导致MCCD Ⅰ型( MIM.MCCD以尿中3 -甲基巴豆酰甘氨酸( 3 - methylcrotonylglycine , 3 - MCG )和3 -羟基异戊酸( 3 - hydroxyisovaleric , 3 - HIVA )升高为特征,也是新生儿筛查 ......