A synonymous polymorphic variation in ACADM exon 11 affects splicing efficiency and may affect fatty acid oxidation.
Mol Genet Metab
; 110(1-2): 122-8, 2013.
Article
em En
| MEDLINE
| ID: mdl-23810226
ABSTRACT
In recent studies combining genome-wide association and tandem-MS based metabolic profiling, a single-nucleotide polymorphism (SNP), rs211718C>T, located far upstream of the MCAD gene (ACADM) was found to be associated with serum concentrations of medium-chain acylcarnitines indicating improved beta-oxidation of medium-chain fatty acids. We examined the functional basis for this association and identified linkage between rs211718 and the intragenic synonymous polymorphic variant c.1161A>G in ACADM exon 11 (rs1061337). Employing minigene studies we show that the c.1161A allele is associated with exon 11 missplicing, and that the c.1161G allele corrects this missplicing. This may result in production of more full length MCAD protein from the c.1161G allele. Our analysis suggests that the improved splicing of the c.1161G allele is due to changes in the relative binding of splicing regulatory proteins SRSF1 and hnRNP A1. Using publicly available pre-aligned RNA-seq data, we find that the ACADM c.1161G allele is expressed at significantly higher levels than the c.1161A allele across different tissues. This supports that c.1161A>G is a functional SNP, which leads to higher MCAD expression, perhaps due to improved splicing. This study is a proof of principle that synonymous SNPs are not neutral. By changing the binding sites for splicing regulatory proteins they can have significant effects on pre-mRNA splicing and thus protein function. In addition, this study shows that for a sequence variation to have an effect, it might need to change the balance in the relative binding of positive and negative splicing factors.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Processamento Alternativo
/
Acil-CoA Desidrogenase
/
Ácidos Graxos
/
Erros Inatos do Metabolismo Lipídico
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Mol Genet Metab
Assunto da revista:
BIOLOGIA MOLECULAR
/
BIOQUIMICA
/
METABOLISMO
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Dinamarca