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A de novo synonymous variant in EFTUD2 disrupts normal splicing and causes mandibulofacial dysostosis with

Arthur Jacob¹, Jennifer Pasquier^2,3,4, Raphael Carapito⁵

¹Univ. Lille, CNRS, CHU Lille, Institut Pasteur de Lille, UMR 8199 - EGID, F-59000, Lille, France.

BMC Medical Genetics

|September 18, 2020

Abstract

Background:

Mandibulofacial dysostosis with microcephaly (MFDM) is a rare autosomal dominant genetic disease characterized by intellectual and growth retardations, as well as major microcephaly, induced by missense and splice site variants or microdeletions in the EFTUD2 gene.

Case Presentation:

Here, we investigate the case of a young girl with symptoms of MFDM and a normal karyotype. Whole-exome sequencing of the family was performed to identify genetic alterations responsible for this phenotype. We identified a de novo synonymous variant in the EFTUD2 gene. We demonstrated that this synonymous variant disrupts the donor splice-site in intron 9 resulting in the skipping of exon 9 and a frameshift that leads to a premature stop codon.

Conclusions:

We present the first case of MFDM caused by a synonymous variant disrupting the donor splice site, leading to exon skipping.

Keywords:

Case report EFTUD2 Exonic splice enhancer variant Mandibulofacial dysostosis with microcephaly Synonymous splice variant Whole-exome sequencing de novo

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