Biallelic ADGRV1 variants are associated with Rolandic epilepsy
Zhigang Liu1,2, Xingguang Ye1, Jieyan Zhang1
1Department of Pediatrics, Affiliated Foshan Maternity & Child Healthcare Hospital, Southern Medical University, 11 Renminxi Road 11, Foshan, 528000, Guangdong, China.
Genetic variants in ADGRV1, GRIN2B, and RyR2 are linked to Rolandic epilepsy (RE) and atypical RE (ARE). These findings highlight the role of neuronal calcium homeostasis defects in the development of these common childhood epilepsy conditions.
Area of Science:
- Genetics
- Neuroscience
- Pediatrics
Background:
- Rolandic epilepsy (RE) and atypical RE (ARE) are common childhood focal epilepsies.
- The genetic causes for the majority of RE/ARE cases remain unknown.
Purpose of the Study:
- To identify disease-causing genetic variants in patients with RE/ARE.
- To investigate the role of calcium homeostasis in RE/ARE pathogenesis.
Main Methods:
- Whole-exome sequencing was performed on 28 RE/ARE patient trios.
- Clinical data and EEG findings were reviewed.
- Identified variants were validated using Sanger sequencing.
Main Results:
- Compound heterozygous variants in ADGRV1 were found in two familial RE/ARE cases.
- A de novo GRIN2B mutation was identified in a sporadic ARE case.
- A RyR2 variant was found in a family with RE exhibiting incomplete penetrance.
- All identified genes (ADGRV1, GRIN2B, RyR2) are associated with calcium homeostasis.
Conclusions:
- ADGRV1, GRIN2B, and RyR2 gene variants are associated with RE/ARE.
- Defects in neuronal intracellular calcium homeostasis are implicated in RE/ARE pathogenesis.
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