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Updated: Aug 1, 2025

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
A Novel Mutation in the OXCT1 Gene Causing Succinyl-CoA:3-Ketoacid CoA Transferase (SCOT) Deficiency Starting with
Davoud Amirkashani1, Mostafa Asadollahi2,3, Rozita Hosseini4
1Division of Endocrinology and Metabolism, Ali Asghar Children Hospital, Iran University of Medical Sciences, Tehran, Iran.
Abstract:
Succinyl-CoA:3-oxoacid CoA-transferase (SCOT) deficiency is an inborn error of ketone body utilization characterized by intermittent ketoacidosis crises. This study reports the first Iranian patient with SCOT deficiency who presented with seizure and hypotonia at birth. Accordingly, she was consequently re-hospitalized due to hypotonia and respiratory distress. Laboratory tests revealed hyperammonemia, ketonuria, and metabolic acidosis. Besides, the plasma glucose level was normal without any other abnormality. Despite treatment with high-dose bicarbonate, severe acidosis persisted. Poor response to treatment raised a significant diagnostic challenge among specialists until genetic investigation identified a homozygous nonsense mutation (c.79G>T; p.Gly27*) in the OXCT1 gene (NM_000436), causing SCOT deficiency. Genetic studies help clinicians achieve a definite diagnosis of such metabolic disorders. In this case, the accurate and early diagnosis of SCOT deficiency opened new therapeutic possibilities, including frequent carbohydrate-rich meals and low fat and protein diet. Moreover, our findings expand the mutational and clinical spectrum of SCOT deficiency.
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