Journal of neurogeneticsPub Date : 2024-09-01Epub Date: 2024-11-17DOI: 10.1080/01677063.2024.2424777
Oğuzhan Yarali, Özge Beyza Gündoğdu Öğütlü, Serdar Saritaş, Mustafa Can Guler, Filiz Keskin, Ayberk Türkyilmaz
{"title":"Epilepsy genetics in the paediatric population of the Eastern Anatolia region of Turkey.","authors":"Oğuzhan Yarali, Özge Beyza Gündoğdu Öğütlü, Serdar Saritaş, Mustafa Can Guler, Filiz Keskin, Ayberk Türkyilmaz","doi":"10.1080/01677063.2024.2424777","DOIUrl":"10.1080/01677063.2024.2424777","url":null,"abstract":"<p><p>This study investigates the genetic causes of epilepsy in 166 paediatric patients under the age of 16 from the East Anatolian region of Turkey, who were treated at Erzurum City Hospital between 2018 and 2023. Patients with early-onset seizures, a family history of epilepsy or intellectual disability was selected for genetic analysis using a next-generation sequencing (NGS) gene panel targeting 449 genes associated with epilepsy and epileptic encephalopathy. The analysis revealed that pathogenic or probable pathogenic mutations were present in 14.8% (32 patients), highlighting the significant role of genetic factors in the aetiology of epilepsy in this population. In addition, 30.6% (66 patients) carried variants of uncertain significance (VUS), which, although not classified as pathogenic, have potential clinical relevance. Many epilepsy-related genes follow an autosomal dominant inheritance pattern, meaning that VUSs may gain pathogenic significance as more data and global studies accumulate, emphasising the evolving nature of genetic research. In addition to genetic factors, other aetiological causes such as perinatal insults (15.3%) and infections (7.9%) were identified, highlighting the multifactorial origin of epilepsy. While pathogenic mutations currently serve as important diagnostic and therapeutic markers, the role of VUS should not be underestimated. Genetic testing has proven to be essential for understanding the complex causes of epilepsy, providing opportunities for personalised treatment and genetic counselling. This study highlights the importance of genetic testing in regions such as Eastern Anatolia, where both environmental and genetic factors may influence the prevalence of epilepsy. As genetic databases expand, it is likely that the understanding of VUS will evolve, improving the clinical management of epilepsy through more targeted therapies and improved outcomes.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"112-121"},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-09-01Epub Date: 2024-10-29DOI: 10.1080/01677063.2024.2419098
Nathan J Wellington, Ana P Boucas, Jim Lagopoulos, Anna V Kuballa
{"title":"Clinical potential of epigenetic and microRNA biomarkers in PTSD.","authors":"Nathan J Wellington, Ana P Boucas, Jim Lagopoulos, Anna V Kuballa","doi":"10.1080/01677063.2024.2419098","DOIUrl":"10.1080/01677063.2024.2419098","url":null,"abstract":"<p><p>Molecular studies identifying alterations associated with PTSD have predominantly focused on candidate genes or conducted genome-wide analyses, often encountering issues with replicability. This review aims to identify robust bi-directional epigenetic and microRNA (miRNA) regulators focusing on their functional impacts on post-traumatic stress disorder (PTSD) and their utility in clinical diagnosis, whilst examining knowledge gaps in the existing research. A systematic search was conducted across multiple databases, including Web of Science, Scopus, Global Health (CABI), and PubMed, augmented by grey literature, yielding 3465 potential articles. Ultimately, 92 studies met the inclusion criteria and were analysed to pinpoint significant epigenetic changes with clinically relevant potential in PTSD. The selected studies explored histone modifications, CpG sites, single nucleotide polymorphisms (SNPs), and miRNA biomarkers. Specifically, nine studies examined epigenetic markers, detailing the influence of methylation on chromatin accessibility at histone positions H3K4, H3K9, and H3K36 within a PTSD context. Seventy-three studies investigated DNA methylation, identifying 20 hypermethylated and five hypomethylated CpG islands consistently observed in PTSD participants. Nineteen studies linked 88 SNPs to PTSD, with only one SNP replicated within these studies. Furthermore, sixteen studies focused on miRNAs, with findings indicating 194 downregulated and 24 upregulated miRNAs were associated with PTSD. Although there are epigenetic mechanisms that are significantly affected by PTSD, a granular deconstruction of these mechanisms elucidates the need to incorporate more nuanced approaches to identifying the factors that contribute to PTSD. Technological advances in diagnostic tools are driving the need to integrate detailed participant characteristics, trauma type, genetic susceptibilities, and best practices for robust reporting. This comprehensive approach will be crucial for enhancing the translational potential of PTSD research for clinical application.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"79-101"},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142522137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Molecular analysis of <i>SMN2, NAIP,</i> and <i>GTF2H2</i> gene deletions and relationships with clinical subtypes of spinal muscular atrophy.","authors":"Nilgun Karasu, Hamit Acer, Hilal Akalin, Burcu Turkgenc, Mikail Demir, Izem Olcay Sahin, Nuriye Gokce, Ayten Gulec, Asli Ciplakligil, Ayse Caglar Sarilar, Isa Cuce, Hakan Gumus, Huseyin Per, Mehmet Canpolat, Munis Dundar","doi":"10.1080/01677063.2024.2407332","DOIUrl":"10.1080/01677063.2024.2407332","url":null,"abstract":"<p><p>SMA (spinal muscular atrophy) is an autosomal recessive neuromuscular disease that causes muscle atrophy and weakness. SMA is diagnosed by a homozygous deletion in exon 7 of the <i>SMN1</i> gene. However, mutations in genes located in the SMA region, such as <i>SMN2</i>, <i>NAIP, SERF1,</i> and <i>GTF2H2,</i> may also contribute to the severity of the disease. Within our study's scope, 58 SMA patients who applied in 2018-2021 and 40 healthy controls were analyzed. The study retrospectively included the SMN1 and SMN2 copy numbers previously determined by the MLPA method. Then, <i>NAIP</i> gene analyses with the multiplex PCR method and <i>GTF2H2</i> gene analyses with the RFLP method were performed. There was a significant correlation (<i>p</i> = 0.00001) between <i>SMN2</i> copy numbers and SMA subtypes. Also, the <i>NAIP</i> gene (<i>p</i> = 0.01) and the <i>GTF2H2</i> gene (<i>p</i> = 0.0049) revealed a significant difference between healthy and SMA subjects, whereas the SMA subtypes indicated no significant differences. We detected a significant correlation between clinical subtypes and HFMSE scores in 32 pediatric SMA patients compared (<i>p</i> = 0.01). While pediatric patients with <i>GTF2H2</i> deletions demonstrated higher motor functions, and those with <i>NAIP</i> deletions demonstrated lower motor functions. In this study, we examined the relationship between <i>NAIP</i> and <i>GTF2H2</i>, called SMN region modifier genes, and the clinical severity of the disease in Turkish SMA patients. Despite its small scale, this research will benefit future investigations into the pathogenesis of SMA disease.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"102-111"},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-09-01Epub Date: 2024-08-22DOI: 10.1080/01677063.2024.2390403
Mina Lashkarboloki, Amin Jahanbakhshi, Seyed Javad Mowla, Hassan Bjeije, Bahram M Soltani
{"title":"Oncogenic roles of long non-coding RNAs in essential glioblastoma signaling pathways.","authors":"Mina Lashkarboloki, Amin Jahanbakhshi, Seyed Javad Mowla, Hassan Bjeije, Bahram M Soltani","doi":"10.1080/01677063.2024.2390403","DOIUrl":"10.1080/01677063.2024.2390403","url":null,"abstract":"<p><p>Glioblastoma multiforme (GBM) is an aggressive and diffuse type of glioma with the lowest survival rate in patients. The recent failure of multiple treatments suggests that targeting several targets at once may be a different strategy to overcome GBM carcinogenesis. Normal function of oncogenes and tumor suppressor genes need for the preservation of regular cellular processes, so any defects in these genes' activity, operate the corresponding signaling pathways, which initiate carcinogenic processes. Long non-coding RNAs (lncRNAs) that can be found in the cytoplasm or nucleus of the cells, control the transcription and translation of genes. LncRNAs perform a variety of functions, including epigenetic alteration, protein modification and stability, transcriptional regulation, and competition for miRNA that regulate mRNA translation through sponging miRNAs. Identification of various oncogenic lncRNAs and their multiple roles in brain cancers making them potential candidates for use as glioma diagnostic, prognostic, and therapeutic targets in the future. This study highlighted multiple oncogenic lncRNAs and classified them into different signaling pathways based on the regulated target genes in glioblastoma.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"62-78"},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142017752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-06-01Epub Date: 2024-07-15DOI: 10.1080/01677063.2024.2372496
Jasmine Policherla, Fatema J Serajee, Salman Rashid, A H M Mahbubul Huq
{"title":"Carbamazepine responsive episodic dystonia and hallucination due to pyruvate dehydrogenase E2 (DLAT) gene mutation.","authors":"Jasmine Policherla, Fatema J Serajee, Salman Rashid, A H M Mahbubul Huq","doi":"10.1080/01677063.2024.2372496","DOIUrl":"10.1080/01677063.2024.2372496","url":null,"abstract":"<p><p>Pyruvate Dehydrogenase (PDH) E2 deficiency due to Dihydrolipoamide acetyltransferase (DLAT) mutations is a very rare condition with only nine reported cases to date. We describe a 15-year-old girl with mild intellectual disability, paroxysmal dystonia and bilateral basal ganglia signal abnormalities on brain magnetic resonance imaging (MRI). Additionally, neurophysiological, imaging, metabolic and exome sequencing studies were performed. Routine metabolite testing, and GLUT1 and PRRT2 mutation analysis were negative. A repeat brain MRI revealed 'Eye-of-the-tiger-sign'. Exome sequencing identified homozygous valine to glycine alteration at amino acid position 157 in the DLAT gene. Bioinformatic and family analyses indicated that the alteration was likely pathogenic. Patient's dystonia was responsive to low-dose carbamazepine. On weaning carbamazepine, patient developed hallucinations which resolved after carbamazepine was restarted. PDH E2 deficiency due to DLAT mutation has a more benign course compared to common forms of PDH E1 deficiency due to X-linked PDHA1 mutations. All known cases of PDH E2 deficiency due to DLAT mutations share the features of episodic dystonia and intellectual disability. Our patient's dystonia and hallucinations responded well to low-dose carbamazepine.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"41-45"},"PeriodicalIF":1.8,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141616630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-06-01Epub Date: 2024-07-08DOI: 10.1080/01677063.2024.2373363
Shivani Sharma, Anita Mahadevan, Gayathri Narayanappa, Monojit Debnath, Periyasamy Govindaraj, Sumanth Shivaram, Doniparthi V Seshagiri, Ramesh Siram, Akhilesh Shroti, Parayil S Bindu, Yasha T Chickabasaviah, Arun B Taly, Madhu Nagappa
{"title":"Exploring the evidence for mitochondrial dysfunction and genetic abnormalities in the etiopathogenesis of tropical ataxic neuropathy.","authors":"Shivani Sharma, Anita Mahadevan, Gayathri Narayanappa, Monojit Debnath, Periyasamy Govindaraj, Sumanth Shivaram, Doniparthi V Seshagiri, Ramesh Siram, Akhilesh Shroti, Parayil S Bindu, Yasha T Chickabasaviah, Arun B Taly, Madhu Nagappa","doi":"10.1080/01677063.2024.2373363","DOIUrl":"10.1080/01677063.2024.2373363","url":null,"abstract":"<p><p>Tropical ataxic neuropathy (TAN) is characterised by ataxic polyneuropathy, degeneration of the posterior columns and pyramidal tracts, optic atrophy, and sensorineural hearing loss. It has been attributed to nutritional/toxic etiologies, but evidence for the same has been equivocal. TAN shares common clinical features with inherited neuropathies and mitochondrial disorders, it may be hypothesised that genetic abnormalities may underlie the pathophysiology of TAN. This study aimed to establish evidence for mitochondrial dysfunction by adopting an integrated biochemical and multipronged genetic analysis. Patients (<i>n</i> = 65) with chronic progressive ataxic neuropathy with involvement of visual and/or auditory pathways underwent deep phenotyping, genetic studies including mitochondrial DNA (mtDNA) deletion analysis, mtDNA and clinical exome sequencing (CES), and respiratory chain complex (RCC) assay. The phenotypic characteristics included dysfunction of visual (<i>n</i> = 14), auditory (<i>n</i> = 12) and visual + auditory pathways (<i>n</i> = 29). Reduced RCC activity was present in 13 patients. Mitochondrial DNA deletions were noted in five patients. Sequencing of mtDNA (<i>n</i> = 45) identified a homoplasmic variant (<i>MT-ND6)</i> and a heteroplasmic variant (<i>MT-COI</i>) in one patient each. CES (<i>n</i> = 45) revealed 55 variants in nuclear genes that are associated with neuropathy (<i>n</i> = 27), deafness (<i>n</i> = 7), ataxia (<i>n</i> = 4), and mitochondrial phenotypes (<i>n</i> = 5) in 36 patients. This study provides preliminary evidence that TAN is associated with a spectrum of genetic abnormalities, including those associated with mitochondrial dysfunction, which is in contradistinction from the prevailing hypothesis that TAN is related to dietary toxins. Analysing the functional relevance of these genetic variants may improve the understanding of the pathogenesis of TAN.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"27-34"},"PeriodicalIF":1.8,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141555028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-06-01Epub Date: 2024-07-08DOI: 10.1080/01677063.2024.2374898
Annabelle Arlt, Esra Akova-Öztürk, Anja Schirmacher, Bernhard Schlüter, Stephan Rust, Gerd Meyer Zu Hörste, Heinz Wiendl, Sarah Wiethoff
{"title":"SORDD: mutation frequency and phenotype in predominantly axonal Charcot-Marie-Tooth disease of undefined genetic cause.","authors":"Annabelle Arlt, Esra Akova-Öztürk, Anja Schirmacher, Bernhard Schlüter, Stephan Rust, Gerd Meyer Zu Hörste, Heinz Wiendl, Sarah Wiethoff","doi":"10.1080/01677063.2024.2374898","DOIUrl":"10.1080/01677063.2024.2374898","url":null,"abstract":"<p><p>Pathogenic, biallelic variants in <i>SORD</i> were identified in 2020 as a novel cause for autosomal-recessive Charcot-Marie-Tooth disease (CMT) type 2, an inherited neuropathy. <i>SORD</i> codes for the enzyme sorbitol dehydrogenase. Loss of this enzyme's activity leads to an increase of sorbitol in serum. We retrospectively screened 166 patients with axonal neuropathy (predominantly CMT type 2, but including intermediate form of CMT and distal hereditary motor neuropathy (dHMN)) without identified genetic etiology for <i>SORD</i> mutations at a single large German neuromuscular center. Clinical and electrophysiology exam findings were analyzed for genotype-phenotype correlation. Five patients of the total cohort of 166 patients harbored pathogenic variants in <i>SORD</i> (3%). The homozygous frameshift variant c.757delG (p.Ala253Glnfs*27) was the most common (4/5). One additional case carried this variant on one allele only and an additional pathogenic missense variant c.458C > A (p.Ala153Asp) on the other allele. Age of onset ranged from early infancy to mid-twenties, and phenotypes comprised axonal CMT (4) and dHMN (1). Our findings strengthen the importance of screening for pathogenic variants in <i>SORD</i>, especially in patients with genetically unconfirmed axonal neuropathy, especially CMT type 2 and dHMN.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"35-40"},"PeriodicalIF":1.8,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141555029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jing Guan, Xiaonan Wu, Jiao Zhang, Jin Li, Hongyang Wang, Qiuju Wang
{"title":"Global research landscape on the contribution of de novo mutations to human genetic diseases over the past 20 years: bibliometric analysis","authors":"Jing Guan, Xiaonan Wu, Jiao Zhang, Jin Li, Hongyang Wang, Qiuju Wang","doi":"10.1080/01677063.2024.2335171","DOIUrl":"https://doi.org/10.1080/01677063.2024.2335171","url":null,"abstract":"As the contribution of de novo mutations (DNMs) to human genetic diseases has been gradually uncovered, analyzing the global research landscape over the past 20 years is essential. Because of the l...","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":"50 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-03-01Epub Date: 2024-05-20DOI: 10.1080/01677063.2024.2343672
Pingfei Jin, Yong Li, Yao Li
{"title":"Meta-analysis of the association between <i>C9orf72</i> repeats and neurodegeneration diseases.","authors":"Pingfei Jin, Yong Li, Yao Li","doi":"10.1080/01677063.2024.2343672","DOIUrl":"10.1080/01677063.2024.2343672","url":null,"abstract":"<p><p>To conduct a meta-analysis investigating the relationship between the chromosome 9 open reading frame 72 (<i>C9orf72</i>) GGGGCC (G4C2) and neurodegenerative diseases (NDs), including Alzheimer's disease (AD), Parkinson's disease (PD), multiple system atrophy (MSA), progressive supranuclear palsy (PSP) and corticobasal degeneration (CBD). We searched the EMBASE, PubMed, Web of Science, and Cochrane databases. Twenty-seven case-control studies were included, comprising 7202 AD, 5856 PD, 644 MSA, 439 PSP, and 477 CBD cases. This study demonstrated that <i>C9orf72</i> repeat expansions (>30) were associated with AD, MSA, PSP, and CBD (AD: OR = 4.88, 95% CI = 2.71-8.78; MSA: OR = 6.98, 95% CI = 1.48-33.01; PSP: OR =10.04, 95% CI = 2.72-37.10; CBD: OR = 28.04, 95% CI = 10.17-77.31). <i>C9orf72</i> intermediate repeat expansions (20-30) were not associated with AD and MSA (AD: OR = 1.16, 95% CI = 0.39-3.45; MSA: OR = 5.65, 95% CI = 0.69-46.19), while <i>C9orf72</i> repeat expansions (>30) were not associated with the risk of PD (OR = 1.51, 95% CI = 0.55-4.17), <i>C9orf72</i> intermediate repeat expansions (20-30) were indeed associated with PD (OR = 2.43, 95% CI = 1.20-4.9). The pathological mechanism of <i>C9orf72</i> G4C2 repeat expansions differs across various NDs due to the varying number of pathogenic expansions. Measuring the number of <i>C9orf72</i> G4C2 repeats may be useful in the early-stage differential diagnosis of various NDs.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"1-8"},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141065895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of neurogeneticsPub Date : 2024-03-01Epub Date: 2024-06-17DOI: 10.1080/01677063.2024.2365634
Asal Asghari Sarfaraz, Neda Jabbarpour, Mortaza Bonyadi, Mohammad Khalaj-Kondory
{"title":"Identification and bioinformatics analysis of a novel variant in the <i>HERC2</i> gene in a patient with intellectual developmental disorder.","authors":"Asal Asghari Sarfaraz, Neda Jabbarpour, Mortaza Bonyadi, Mohammad Khalaj-Kondory","doi":"10.1080/01677063.2024.2365634","DOIUrl":"10.1080/01677063.2024.2365634","url":null,"abstract":"<p><p>HERC2-associated neurodevelopmental-disorders(NDD) encompass a cluster of medical conditions that arise from genetic mutations occurring within the <i>HERC2</i> gene. These disorders can manifest a spectrum of symptoms that impact the brain and nervous system, including delayed psychomotor development, severe mental retardation, seizures and autistic features. Whole-Exome-Sequencing(WES) was performed on a ten-year-old male patient referred to the genetic center for genetic analysis. Blood samples were collected from the proband, his parents, and his sister to extract DNA. PCR-Sanger-sequencing was utilized to validate the findings obtained from WES. In order to obtain a more thorough understanding of the impact of the mutation, an extensive analysis was conducted using bioinformatics tools. WES data analysis identified a homozygous single nucleotide change(C > T) at position c14215 located in exon ninety-two of the <i>HERC2</i> gene (NC_000015.10(NM_004667.6):c.14215C > T). The absence of this mutation among our cohort composed of four hundred normal healthy adults from the same ethnic group, and its absence in any other population database, confirms the pathogenicity of the mutation. This study revealed that the substitution of arginine with a stop codon within the Hect domain caused a premature stop codon at position 4739(p.Arg4739Ter). This mutation significantly results in the production of a truncated HERC2 protein with an incomplete HECT domain. In the final stage of ubiquitin attachment, HECT E3 ubiquitin ligases play a catalytic role by creating a thiolester intermediate using their conserved catalytic cysteine (Cys4762). This intermediate is formed before ubiquitin is transferred to a substrate protein. The truncation of the HERC2 protein is expected to disrupt its ability to perform this function, which could potentially hinder important regulatory processes related to the development and maintenance of synapses. The identification of a novel pathogenic variant, NC_000015.10(NM_004667.6):c.14215C > T, located within the ninety-two exon of the <i>HERC2</i> gene, is notable for its association with an autosomal recessive inheritance pattern in cases of Intellectual Developmental Disorder(IDD). In the end, this variant could potentially play a part in the underlying mechanisms leading to the onset of intellectual developmental disorder.</p>","PeriodicalId":16491,"journal":{"name":"Journal of neurogenetics","volume":" ","pages":"19-25"},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141331183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}