A single mutation in MCCC1 or MCCC2 as a potential cause of positive screening for 3-methylcrotonyl-CoA carboxylase deficiency.
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Morscher RJ, Grunert SC, Burer C, Burda P, Suormala T, Fowler B, Baumgartner MR
A single mutation in MCCC1 or MCCC2 as a potential cause of positive screening for 3-methylcrotonyl-CoA carboxylase deficiency.
Mol Genet Metab. 2012 Apr;105(4):602-6. doi: 10.1016/j.ymgme.2011.12.018. Epub 2011 Dec 31.
- PubMed ID
- 22264772 [ View in PubMed]
- Abstract
Isolated 3-Methylcrotonyl-CoA carboxylase deficiency (MCC deficiency) is an organic aciduria presenting with a highly variable phenotype and has been part of newborn screening programs in various countries, in particular in the US. Here we present enzymatic and genetic characterisation of 22 individuals with increased 3-hydroxyisovalerylcarnitine and/or 3-methylcrotonylglycine suggesting MCC deficiency, but only partially reduced 3-methylcrotonyl-CoA carboxylase activity. Among these, 21 carried a single mutant allele in either MCCC1 (n=20) or MCCC2 (n=1). Our results suggest that heterozygosity for such a single deleterious mutation may lead to misdiagnosis of MCC deficiency.