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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/167706
A deep intronic splice variant advises reexamination of presumably dominant SPG7 Cases
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Objective: to identify causative mutations in a patient affected by ataxia and spastic paraplegia. Methods: whole-exome sequencing (WES) and whole-genome sequencing (WGS) were performed using patient's DNA sample. RT-PCR and cDNA Sanger sequencing were performed on RNA extracted from patient's fibroblasts, as well as western blot. Results: a novel missense variant in SPG7 (c.2195T> C; p.Leu732Pro) was first found by whole-exome sequencing (WES), while the second, also unreported, deep intronic variant (c.286 + 853A>G) was identified by whole-genome sequencing (WGS). RT-PCR confirmed the in silico predictions showing that this variant activated a cryptic splice site, inducing the inclusion of a pseudoexon into the mRNA sequence, which encoded a premature stop codon. Western blot showed decreased SPG7 levels in patient's fibroblasts. Interpretation: identification of a deep intronic variant in SPG7, which could only have been detected by performing WGS, led to a diagnosis in this HSP patient. This case challenges the notion of an autosomal dominant inheritance for SPG7, and illustrates the importance of performing WGS subsequently or alternatively to WES to find additional mutations, especially in patients carrying one variant in a gene causing a predominantly autosomal recessive disease.
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VERDURA, Edgard, SCHLÜTER, Agatha, FERNÁNDEZ EULATE, Gorka, RAMOS-MARTÍN, Raquel, ZULAICA, Miren, PLANAS SERRA, Laura, RUIZ, Montserrat, FOURCADE, Stéphane, CASASNOVAS PONS, Carlos, LÓPEZ DE MUNAIN, Adolfo, PUJOL ONOFRE, Aurora. A deep intronic splice variant advises reexamination of presumably dominant SPG7 Cases. _Annals Of Clinical And Translational Neurology_. 2020-01-01. Vol. 7, núm. num 1, pàgs. 105-111. [consulta: 23 de gener de 2026]. ISSN: 2328-9503. [Disponible a: https://hdl.handle.net/2445/167706]