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Exome sequencing coupled with mRNA analysis identifies NDUFAF6 as a Leigh gene.

Abstract：

: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.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Bianciardi L,Imperatore V,Fernandez-Vizarra E,Lopomo A,Falabella M,Furini S,Galluzzi P,Grosso S,Zeviani M,Renieri A,Mari F,Frullanti E

doi

10.1016/j.ymgme.2016.09.001

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

214-222

issue

3

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(16)30203-7

journal_volume

119

pub_type

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