Further Delineation of the TRAPPC6B Disorder: Report on a New Family and Review

J Pediatr Genet. 2019 Dec;8(4):252-256. doi: 10.1055/s-0039-1693664. Epub 2019 Jul 30.


Pathogenic variants in the TRAPPC6B gene were recently found to be associated in three consanguineous families, with microcephaly, epilepsy, and brain malformations. Here, we report on a 3.5-year-old boy, born to consanguineous Lebanese parents, who presented with developmental delay, lactic acidosis, postnatal microcephaly, and abnormal brain magnetic resonance imaging. By whole exome sequencing, a novel homozygous likely pathogenic variant in exon 1 of the TRAPPC6B gene (c.23T > A; [p.Leu8*]) was identified. A review of the clinical description and literature is discussed, pointing out the phenotypic heterogeneity associated with mutations in this gene.

Keywords: Lebanon; TRAPPC6B; whole exome sequencing.

Publication types

  • Case Reports