Rebecca Foulger edited their review of gene: SUCLG1: Added comment: Review and rating collated by Tracy Lester (Oxford Medical Genetics Laboratories Oxford University Hospitals NHS Foundation Trust, 2019_02_06) on behalf of Wessex and West Midlands GLH for GMS Neurology specialist test group, for Clinical Indication R59 'Early onset or syndromic epilepsy'. Review contributors: Alison Callaway and John Taylor. Suggested gene rating: Amber. ; Changed rating: AMBER
Rebecca Foulger commented on gene: SUCLG1: PMID:26475597 (Carrozzo et al 2016) report 25 new patients with succinate-CoA ligase deficiency, and review the clinical and molecular findings in these and 46 previously reported patients. Of the 71 patients, 50 had SUCLA2 mutations and 21 had SUCLG1 mutations. Epilepsy was much more frequent in patients with SUCLA2 mutations compared to patients with SUCLG1 mutations: Only 1 patient with the SUCLG1 variant had epilepsy.
Rebecca Foulger commented on gene: SUCLA2: PMID:26475597 (Carrozzo et al 2016) report 25 new patients with succinate-CoA ligase deficiency, and review the clinical and molecular findings in these and 46 previously reported patients. Of the 71 patients, 50 had SUCLA2 mutations and 21 had SUCLG1 mutations. Epilepsy reported as generalized seizures, unspecified epilesy or infantile spasms was mainly reported in patients with SUCLA2 variants. Only 1 patient with the SUCLG1 variant had epilepsy (5%). At least 3 cases of epilepsy listed in new patients with SUCLA2 variants (supplementary material).
Rebecca Foulger Added comment: Comment on list classification: Kept rating as Amber. Confirmed DD-G2P gene for FATAL INFANTILE LACTIC ACIDOSIS. Although patients with SUCLG1 variants can report with seizures (1 of 3 patients in PMID:26028457 plus EEG abnormalities in PMID:27484306), there are currently insufficient cases to rate as diagnostic.
Rebecca Foulger commented on gene: SUCLG1: PMID:28358460 gives an overview of treatment of seizures when present in SUCLG1-related mitochondrial DNA (mtDNA) depletion syndrome patients.
Rebecca Foulger commented on gene: SUCLG1: Seizures are not reported in the clinical phenotype of patients in PMIDs 17668387, 19526370 and 20693550, which report patients with SUCLG1 variants.
Rebecca Foulger commented on gene: SUCLG1: PMID:26028457 (Liu et al 2016) report 3 unrelated Chinese patients with severe psychomotor retardation, hypotonia, dystonia and athetoid movements, and homozygous/compound het variants in SUCLG1. Patient 2 had Epilepsy (Table 1).
Rebecca Foulger Phenotypes for gene: SUCLG1 were changed from to Mitochondrial DNA depletion syndrome 9 (encephalomyopathic type with methylmalonic aciduria), 245400