Early onset or syndromic epilepsy
Gene: LARSThe rating of this gene has been updated following NHS Genomic Medicine Service approval.Created: 3 Mar 2022, 5:34 p.m. | Last Modified: 3 Mar 2022, 5:34 p.m.
Panel Version: 2.491
Added new-gene-name tag, new approved HGNC gene symbol for LARS is LARS1Created: 8 Dec 2020, 10:28 a.m. | Last Modified: 8 Dec 2020, 10:28 a.m.
Panel Version: 2.233
Comment on list classification: New gene added by Konstantinos Varvagiannis. Seizures are prevalent among affected individuals, often triggered by infections. There is sufficient evidence for this gene to be rated GREEN at the next major review and depending on the policy of inclusion of metabolic genes on this panel (added 'for-review tag).Created: 8 Dec 2020, 10:27 a.m. | Last Modified: 8 Dec 2020, 10:27 a.m.
Panel Version: 2.233
Please consider inclusion with amber/green rating in the current panel.
Biallelic pathogenic LARS1 variants cause Infantile liver failure syndrome 1, MIM# 615438.
Lenz et al (2020 - PMID: 32699352) review the phenotype of 25 affected individuals from 15 families.
Seizures occurred in 19/24 and were commonly associated with infections. Encephalopathic episodes (in 13 patients) accompanied by seizures up to status epilepticus occurred independently of hepatic decompensation.
In addition 22/24 presented with neurodevelopmental delay. The authors comment that cognitive impairment was present in 13/17 individuals (mild-severe) whereas most presented with learning disabilities.
These patients will be most likely investigated for their liver disease (although presentation was highly variable and/or very mild in few).
The gene encodes a cytoplasmic amino-acyl tRNA synthetase (ARS) with neurologic manifestations observed in almost all patients (and seizures / DD and ID common to other disorders due to mutations in other genes encoding for ARSs).
Please note that the HGNC approved symbol for this gene is LARS1.
Sources: LiteratureCreated: 27 Jul 2020, 9:57 a.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Infantile liver failure syndrome 1, MIM# 615438
Publications
Tag for-review was removed from gene: LARS.
Source Expert Review Green was added to LARS. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Tag new-gene-name tag was added to gene: LARS.
Tag for-review tag was added to gene: LARS.
Gene: lars has been classified as Amber List (Moderate Evidence).
gene: LARS was added gene: LARS was added to Genetic epilepsy syndromes. Sources: Literature Mode of inheritance for gene: LARS was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: LARS were set to 32699352 Phenotypes for gene: LARS were set to Infantile liver failure syndrome 1, MIM# 615438 Penetrance for gene: LARS were set to Complete Review for gene: LARS was set to GREEN