ST3GAL5-Related Disorders: A Deficiency in Ganglioside Metabolism and a Genetic Cause of Intellectual Disability and Choreoathetosis

Eliza Gordon-Lipkin, Julie S. Cohen, Siddharth Srivastava, Bruno P. Soares, Eric Levey, Ali Fatemi

Research output: Contribution to journalArticlepeer-review

Abstract

GM3 synthase deficiency is due to biallelic pathogenic variants in ST3GAL5, which encodes a sialyltransferase that synthesizes ganglioside GM3. Key features of this rare autosomal recessive condition include profound intellectual disability, failure to thrive and infantile onset epilepsy. We expand the phenotypic spectrum with 3 siblings who were found by whole exome sequencing to have a homozygous pathogenic variant in ST3GAL5, and we compare these cases to those previously described in the literature. The siblings had normal birth history, subsequent developmental stagnation, profound intellectual disability, choreoathetosis, failure to thrive, and visual and hearing impairment. Ichthyosis and self-injurious behavior are newly described in our patients and may influence clinical management. We conclude that GM3 synthase deficiency is a neurodevelopmental disorder with consistent features of profound intellectual disability, choreoathetosis, and deafness. Other phenotypic features have variable expressivity, including failure to thrive, epilepsy, regression, vision impairment, and skin findings. Our analysis demonstrates a broader phenotypic range of this potentially under-recognized disorder.

Original languageEnglish (US)
Pages (from-to)825-831
Number of pages7
JournalJournal of child neurology
Volume33
Issue number13
DOIs
StatePublished - Nov 1 2018

Keywords

  • GM3 synthase
  • ST3GAL5
  • cerebral palsy
  • gangliosides
  • intellectual disability

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Clinical Neurology

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