Exome sequencing coupled with mRNA analysis identifies NDUFAF6 as a Leigh gene
| Autor: | Alessandra Renieri, Massimo Zeviani, Salvatore Grosso, Simone Furini, Micol Falabella, Laura Bianciardi, Angela Lopomo, Paolo Galluzzi, Elisa Frullanti, Francesca Mari, Valentina Imperatore, Erika Fernandez-Vizarra |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Exome sequencing Male Heterozygote Endocrinology Diabetes and Metabolism Messenger Respiratory chain Leigh syndrome NDUFAF6 RNA analysis Biochemistry Molecular Biology Genetics Endocrinology Biology Speech Disorders Mitochondrial Proteins Striatonigral Degeneration 03 medical and health sciences Protein-fragment complementation assay Alleles Child Preschool Exome High-Throughput Nucleotide Sequencing Humans Leigh Disease Mutation Pedigree Phenotype RNA Messenger Allele Child Preschool Gene Messenger RNA RNA Molecular biology Diabetes and Metabolism 030104 developmental biology |
| Zdroj: | Molecular genetics and metabolism. 119(3) |
| ISSN: | 1096-7206 |
| Popis: | We report here the case of a young male who started to show verbal fluency disturbance, clumsiness and gait anomalies at the age of 3.5years and presented bilateral striatal necrosis. Clinically, the diagnosis was compatible with Leigh syndrome but the underlying molecular defect remained elusive even after exome analysis using autosomal/X-linked recessive or de novo models. Dosage of respiratory chain activity on fibroblasts, but not in muscle, underlined a deficit in complex I. Re-analysis of heterozygous probably pathogenic variants, inherited from one healthy parent, identified the p.Ala178Pro in NDUFAF6 , a complex I assembly factor. RNA analysis showed an almost mono-allelic expression of the mutated allele in blood and fibroblasts and puromycin treatment on cultured fibroblasts did not lead to the rescue of the maternal allele expression, not supporting the involvement of nonsense-mediated RNA decay mechanism. Complementation assay underlined a recovery of complex I activity after transduction of the wild-type gene. Since the second mutation was not detected and promoter methylation analysis resulted normal, we hypothesized a non-exonic event in the maternal allele affecting a regulatory element that, in conjunction with the paternal mutation, leads to the autosomal recessive disorder and the different allele expression in various tissues. This paper confirms NDUFAF6 as a genuine morbid gene and proposes the coupling of exome sequencing with mRNA analysis as a method useful for enhancing the exome sequencing detection rate when the simple application of classical inheritance models fails. |
| Databáze: | OpenAIRE |
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