Regional differences in the frequency of the c.985A>G ACADM mutation: Findings from a meta-regression of genotyping and screening studies

Journal article

Several countries include medium-chain acyl-CoA dehydrogenase (MCAD) deficiency, a rare autosomal recessive disease, in their newborn screening programmes despite prevalence uncertainty. We estimated the frequency of its most common mutation, c.985A>G, tested for regional differences and compared screening and genotype frequencies. We identified 43 studies reporting the frequency of c.985A>G over 10 million individuals, and pooled frequency data using a novel Bayesian approach. We found significant variation in the frequency of the mutation across regions supporting a reported founder effect. The proportion of c.985A>G homozygotes was highest in Western Europe with 4.1 (95%CI: 2.8-5.6) per 100,000 individuals, then the New World (3.2, 95%CI: 2.0-4.7), Southern (1.2, 95%CI: 0.6-2.0) and Eastern European regions (0.9, 95%CI: 0.5-1.7). No cases with the mutation were identified in Asian and Middle Eastern regions. Significant differences were found in some countries between the genotype and screening allele frequency of c.985A>G. Our predictions could inform the frequency of the mutation by region and our approach could apply to other genetic conditions. © 2013 John Wiley and Sons A/S. Published by John Wiley and Sons Ltd.

Authors: Leal, J; Ades, A; Wordsworth, S; Dezateux, C

• Journal: Clinical Genetics
• Volume: 85
• Issue: 3
• Pages: 253-259
• Publication date: 2014-03-01
• DOI: 10.1111/cge.12157
• EISSN: 1399-0004
• ISSN: 0009-9163
• Language: English
• Keywords: Inborn errors of metabolism; MCAD deficiency; Medium-chain acyl-CoA dehydrogenase deficiency; C.985A>G