AUTHOR=Hu Yan , Huang Mingwei , Wen Jialun , Gao Jian , Long Weiwei , Shen Yansheng , Zeng Qi , Chen Yan , Zhang Tian , Liao Jianxiang , Liu Qiuli , Li Nannan , Lin Sufang TITLE=Case report: splicing effect of a novel heterozygous variant of the NUS1 gene in a child with epilepsy JOURNAL=Frontiers in Genetics VOLUME=14 YEAR=2023 URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2023.1224949 DOI=10.3389/fgene.2023.1224949 ISSN=1664-8021 ABSTRACT=

NUS1 is responsible for encoding of the Nogo-B receptor (NgBR), which is a subunit of cis-prenyltransferase. Over 25 variants in NUS1 have been reported, and these variants have been found to be associated with various phenotypes, such as congenital disorders of glycosylation (CDG) and developmental and epileptic encephalopathy (DEE). We report on the case of a patient who presented with language and motor retardation, epilepsy, and electroencephalogram abnormalities. Upon conducting whole-exome sequencing, we discovered a novel pathogenic variant (chr6:118024873, NM_138459.5: c.791 + 6T>G) in NUS1, which was shown to cause Exon 4 to be skipped, resulting in a loss of 56 amino acids. Our findings strongly suggest that this novel variant of NUS1 is responsible for the development of neurological disorders, including epilepsy. It is believed that the truncation of Nogo-B receptor results in the loss of cis-prenyltransferase activity, which may be the underlying cause of the disease.