Variant in SCYL1 gene causes aberrant splicing in a family with cerebellar ataxia, recurrent episodes of liver failure, and growth retardation

Adi Shohet, Lior Cohen, Danielle Haguel, Yael Mozer, Noam Shomron, Shay Tzur, Lily Bazak, Lina Basel Salmon, Irit Krause

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Herein, we describe two members of one family who presented with recurrent episodes of hepatic failure, cerebellar ataxia, peripheral neuropathy, and short stature. Liver transplantation was considered. Whole-exome sequencing (Trio) revealed a synonymous variant in exon 4 of SCYL1:c.459C>T p. (Gly153Gly), which did not appear to affect the protein sequence. Computational prediction analysis suggested that this modification could alter the SCYL1 mRNA splicing processing to create a premature termination codon. The SCYL1 mRNAs in our patient’s lymphocytes were analyzed and aberrant splicing was found. Molecular analysis of family members identified the parents as heterozygous recessive carriers and the proband as well as an affected aunt as homozygous. Evidently, harmless synonymous variants in the SCYL1 gene can damage gene splicing and hence the expression. We confirmed that the pathogenicity of this variant in the SCYL1 gene was associated with spinocerebellar ataxia, autosomal recessive 21 (SCAR21). Other reported cases (accept one) of liver failure found in the SCYL1 variants resolved during childhood, therefore orthotropic liver transplantation was no longer appropriate.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalEuropean Journal of Human Genetics
Volume27
Issue number2
DOIs
StatePublished - 1 Feb 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018, European Society of Human Genetics.

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