Ethylmalonic encephalopathy: Clinical course and therapy response in an uncommon mild case with a severe ETHE1 mutation

Melike Ersoy, Valeria Tiranti, Massimo Zeviani

Research output: Contribution to journalArticlepeer-review

Abstract

Ethylmalonic encephalopathy (EE) is a rare metabolic disorder caused by dysfunction of ETHE1 protein, a mitochondrial dioxygenase involved in hydrogen sulfide (H2S) detoxification. EE is usually a fatal disease with a severe clinical course mainly associated with developmental delay and regression, recurrent petechiae, orthostatic acrocyanosis, and chronic diarrhoea. Treatment includes antioxidants, antibiotics that lower H2S levels and antispastic medications, which are not curative. The mutations causing absence of the ETHE1 protein, as is the case for the described patient, usually entail a severe fatal phenotype. Although there are rare reported cases with mild clinical findings, the mechanism leading to these milder cases is also unclear. Here, we describe an 11-year-old boy with an ETHE1 gene mutation who has no neurocognitive impairment but chronic diarrhoea, which is controlled by oral medical treatment, and progressive spastic paraparesis that responded to Achilles tendon lengthening.

Original languageEnglish
Article number100641
JournalMolecular Genetics and Metabolism Reports
Volume25
DOIs
Publication statusPublished - Dec 2020

Keywords

  • ETHE1 gene
  • HS
  • Mild course
  • Therapy response

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Endocrinology

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