Neurogenetics最新文献

{"title":"Investigation of RFC1 tandem nucleotide repeat locus in diverse neurodegenerative outcomes in an Indian cohort.","authors":"Nishu Tyagi, Bharathram Uppili, Pooja Sharma, Shaista Parveen, Sheeba Saifi, Abhinav Jain, Akhilesh Sonakar, Istaq Ahmed, Shweta Sahni, Uzma Shamim, Avni Anand, Varun Suroliya, Vivekanand Asokachandran, Achal Srivastava, Sridhar Sivasubbu, Vinod Scaria, Mohammed Faruq","doi":"10.1007/s10048-023-00736-6","DOIUrl":"10.1007/s10048-023-00736-6","url":null,"abstract":"<p><p>An intronic bi-allelic pentanucleotide repeat expansion mutation, (AAGGG)_400-2000, at AAAAG repeat locus in RFC1 gene, is known as underlying genetic cause in cases with cerebellar ataxia, neuropathy, and vestibular areflexia syndrome (CANVAS) and late-onset sporadic ataxia. Biallelic positive cases carry a common recessive risk haplotype, \"AAGA,\" spanning RFC1 gene. In this study, our aim is to find prevalence of bi-allelic (AAGGG)_exp in Indian ataxia and other neurological disorders and investigate the complexity of RFC1 repeat locus and its potential association with neurodegenerative diseases in Indian population-based cohorts. We carried out repeat number and repeat type estimation using flanking PCR and repeat primed PCR (AAAAG/AAAGG/AAGGG) in four Indian disease cohorts and healthy controls. Haplotype assessment of suspected cases was done by genotyping and confirmed by Sanger sequencing. Blood samples and consent of all the cases and detailed clinical details of positive cases were collected in collaboration with A.I.I.M.S. Furthermore, comprehension of RFC1 repeat locus and risk haplotype analysis in Indian background was performed on the NGS data of Indian healthy controls by ExpansionHunter, ExpansionHunter Denovo, and PHASE analysis, respectively. Genetic screening of RFC1-TNR locus in 1998 uncharacterized cases (SCA12: 87; uncharacterized ataxia: 1818, CMT: 93) and 564 heterogenous controls showed that the frequency of subjects with bi-allelic (AAGGG)_exp are 1.15%, < 0.05%, 2.15%, and 0% respectively. Two RFC1 positive sporadic late-onset ataxia cases, one bi-allelic (AAGGG)_exp and another, (AAAGG)_~700/(AAGGG)_exp, had recessive risk haplotype and CANVAS symptoms. Long normal alleles, 15-27, are significantly rare in ataxia cohort. In IndiGen control population (IndiGen; N = 1029), long normal repeat range, 15-27, is significantly associated with A₃G₃ and some rare repeat motifs, AGAGG, AACGG, AAGAG, and AAGGC. Risk-associated \"AAGA\" haplotype of the original pathogenic expansion of A₂G₃ was found associated with the A₃G₃ representing alleles in background population. Apart from bi-allelic (AAGGG)_exp, we report cases with a new pathogenic expansion of (AAAGG)_exp/(AAGGG)_exp in RFC1 and recessive risk haplotype. We found different repeat motifs at RFC1 TNR locus, like AAAAG, AAAGG, AAAGGG, AAAAGG, AAGAG, AACGG, AAGGC, AGAGG, and AAGGG, in Indian background population except ACAGG and (AAAGG)_n/(AAGGG)_n. Our findings will help in further understanding the role of long normal repeat size and different repeat motifs, specifically AAAGG, AAAGGG, and other rare repeat motifs, at the RFC1 locus.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"13-25"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71429522","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":"Lethal variant in the C2A domain may cause severe SYT1-associated neurodevelopmental disorder in the newborns.","authors":"Wendi Huang, Ying Yang, Fengyu Che, Haibin Wu, Ying Ma, Yujuan Zhao","doi":"10.1007/s10048-023-00738-4","DOIUrl":"10.1007/s10048-023-00738-4","url":null,"abstract":"<p><p>Synaptotagmin-1 (SYT1) plays a pivotal role in regulating presynaptic processes, including neurotransmitter release. SYT1 variants perturb synaptic vesicle endocytosis and exocytosis, resulting in a series of neurodevelopmental disorders defined as Baker-Gordon syndrome. Herein, we report the case of a newborn with dysmorphic facial appearance, severe hypotonia, poor feeding, gastroesophageal reflux, and an inability to eat and breathe, diagnosed with Baker-Gordon syndrome. A retrospective search was performed on a newborn with Baker-Gordon syndrome. Medical charts were reviewed, with focus on the clinical presentation, diagnostic process, and treatment outcomes. Whole-genome high-throughput DNA sequencing was performed to identify genetic variants. Whole-exome sequencing identified the likely pathogenic variant as SYT1 C.551 T > C(p.V184A). Sanger sequencing results indicated that this variant was a de novo mutation in a conservative site located in the C2A domain of the protein. The patient died at 57 days old because of severe feeding and breathing problems. Our findings of a novel lethal variant in the C2A domain of SYT1 in the youngest patient diagnosed infantile Baker-Gordon syndrome who presented with the most severe hypotonia reported to date expands the spectrum of SYT1- associated neurodevelopmental disorders.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"27-31"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71489384","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":"Dem-Aging: autophagy-related pathologies and the \"two faces of dementia\".","authors":"N Gammaldi, S Doccini, S Bernardi, M Marchese, M Cecchini, R Ceravolo, S Rapposelli, G M Ratto, S Rocchiccioli, F Pezzini, F M Santorelli","doi":"10.1007/s10048-023-00739-3","DOIUrl":"10.1007/s10048-023-00739-3","url":null,"abstract":"<p><p>Neuronal ceroid lipofuscinosis (NCL) is an umbrella term referring to the most frequent childhood-onset neurodegenerative diseases, which are also the main cause of childhood dementia. Although the molecular mechanisms underlying the NCLs remain elusive, evidence is increasingly pointing to shared disease pathways and common clinical features across the disease forms. The characterization of pathological mechanisms, disease modifiers, and biomarkers might facilitate the development of treatment strategies.The DEM-AGING project aims to define molecular signatures in NCL and expedite biomarker discovery with a view to identifying novel targets for monitoring disease status and progression and accelerating clinical trial readiness in this field. In this study, we fused multiomic assessments in established NCL models with similar data on the more common late-onset neurodegenerative conditions in order to test the hypothesis of shared molecular fingerprints critical to the underlying pathological mechanisms. Our aim, ultimately, is to combine data analysis, cell models, and omic strategies in an effort to trace new routes to therapies that might readily be applied in the most common forms of dementia.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"39-46"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138812648","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":"Two novel cases of biallelic SMPD4 variants with brain structural abnormalities.","authors":"Shintaro Aoki, Kazuki Watanabe, Mitsuhiro Kato, Yukihiko Konishi, Kazuo Kubota, Emiko Kobayashi, Mitsuko Nakashima, Hirotomo Saitsu","doi":"10.1007/s10048-023-00737-5","DOIUrl":"10.1007/s10048-023-00737-5","url":null,"abstract":"<p><p>Sphingomyelin phosphodiesterase 4 (SMPD4) encodes a member of the Mg²⁺-dependent, neutral sphingomyelinase family that catalyzes the hydrolysis of the phosphodiester bond of sphingomyelin to form phosphorylcholine and ceramide. Recent studies have revealed that biallelic loss-of-function variants of SMPD4 cause syndromic neurodevelopmental disorders characterized by microcephaly, congenital arthrogryposis, and structural brain anomalies. In this study, three novel loss-of-function SMPD4 variants were identified using exome sequencing (ES) in two independent patients with developmental delays, microcephaly, seizures, and brain structural abnormalities. Patient 1 had a homozygous c.740_741del, p.(Val247Glufs*21) variant and showed profound intellectual disability, hepatomegaly, a simplified gyral pattern, and a thin corpus callosum without congenital dysmorphic features. Patient 2 had a compound heterozygous nonsense c.2124_2125del, p.(Phe709*) variant and splice site c.1188+2dup variant. RNA analysis revealed that the c.1188+2dup variant caused exon 13 skipping, leading to a frameshift (p.Ala406Ser*6). In vitro transcription analysis using minigene system suggested that mRNA transcribed from mutant allele may be degraded by nonsense-mediated mRNA decay system. He exhibited diverse manifestations, including growth defects, muscle hypotonia, respiratory distress, arthrogryposis, insulin-dependent diabetes mellitus, sensorineural hearing loss, facial dysmorphism, and various brain abnormalities, including cerebral atrophy, hypomyelination, and cerebellar hypoplasia. Here, we review previous literatures and discuss the phenotypic diversity of SMPD4-related disorders.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"3-11"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50163891","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":"Retraction Note: Clinical characterization of familial 1p36.3 microduplication.","authors":"Junping Jiao, Yuping Wang, Yue Hou, Chao Gao, Huimin Shi, Shujuan Tian","doi":"10.1007/s10048-023-00735-7","DOIUrl":"10.1007/s10048-023-00735-7","url":null,"abstract":"","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"49"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10891255/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41164279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: New Editors-in-Chief and future directions: a glimpse into the evolving future of Neurogenetics.","authors":"Geraldine Zimmer-Bensch","doi":"10.1007/s10048-024-00747-x","DOIUrl":"10.1007/s10048-024-00747-x","url":null,"abstract":"","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"47"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10890974/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139522285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Editors-in-Chief and future directions: a glimpse into the evolving future of Neurogenetics.","authors":"Geraldine Zimmer-Bensch","doi":"10.1007/s10048-023-00740-w","DOIUrl":"10.1007/s10048-023-00740-w","url":null,"abstract":"","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"1-2"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10891218/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139076042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dem-Aging: autophagy-related pathologies and the “two faces of dementia”","authors":"N. Gammaldi, S. Doccini, S. Bernardi, M. Marchese, M. Cecchini, R. Ceravolo, S. Rapposelli, GM. Ratto, S. Rocchiccioli, F. Pezzini, F. M. Santorelli","doi":"10.1007/s10048-023-00739-3","DOIUrl":"https://doi.org/10.1007/s10048-023-00739-3","url":null,"abstract":"<p>Neuronal ceroid lipofuscinosis (NCL) is an umbrella term referring to the most frequent childhood-onset neurodegenerative diseases, which are also the main cause of childhood dementia. Although the molecular mechanisms underlying the NCLs remain elusive, evidence is increasingly pointing to shared disease pathways and common clinical features across the disease forms. The characterization of pathological mechanisms, disease modifiers, and biomarkers might facilitate the development of treatment strategies.</p><p>The DEM-AGING project aims to define molecular signatures in NCL and expedite biomarker discovery with a view to identifying novel targets for monitoring disease status and progression and accelerating clinical trial readiness in this field. In this study, we fused multiomic assessments in established NCL models with similar data on the more common late-onset neurodegenerative conditions in order to test the hypothesis of shared molecular fingerprints critical to the underlying pathological mechanisms. Our aim, ultimately, is to combine data analysis, cell models, and omic strategies in an effort to trace new routes to therapies that might readily be applied in the most common forms of dementia.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":"67 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138818851","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":"Atypical retinopathy in ataxia with vitamin E deficiency: report of a sibship","authors":"Stéphane Abramowicz, Alexandre Dentel, Maxime Chouraqui, Bahram Bodaghi, Sara Touhami","doi":"10.1007/s10048-023-00741-9","DOIUrl":"https://doi.org/10.1007/s10048-023-00741-9","url":null,"abstract":"<p>Typical retinitis pigmentosa (RP) may not be the only retinal phenotype encountered in ataxia with vitamin E deficiency (AVED). The following short case series describes a novel form of retinopathy in AVED. We describe two patients with AVED belonging to the same consanguineous sibship. Both presented an unusual retinopathy consisting of scattered, multifocal, nummular, hyperautofluorescent atrophic retinal patches. The retinopathy remained stable under vitamin E supplementation. We hypothesize these changes to be the result of arrested AVED-related RP following early supplementation with α-tocopherol acetate.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":"28 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138715216","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":"Family and literature analysis demonstrates phenotypic effect of two variants in the calpain-3 gene.","authors":"Maike Tomforde,&nbsp;Meike Steinbach,&nbsp;Tobias B Haack,&nbsp;Gregor Kuhlenbäumer","doi":"10.1007/s10048-023-00728-6","DOIUrl":"10.1007/s10048-023-00728-6","url":null,"abstract":"<p><p>Both, recessive (LGMD R1) and dominant (LGMD D4) inheritance occur in calpain 3-related muscular dystrophy. We report a family with calpain-related muscular dystrophy caused by two known variants in the calpain 3 gene (CAPN3, NM_000070.3; (I) c.700G>A, p.Gly234Arg and (II) c.1746-20C>G, p.?). Three family members are compound heterozygous and exhibit a relatively homogeneous phenotype characterized by progressive proximal weakness starting in the third to fourth decade of life in the shoulder girdle and spreading to the legs. Two family members affected only by the p.Gly234Arg heterozygous missense variants show a different phenotype characterized by severe exertional myalgia without overt pareses. We conclude that in our family, the missense variant causes a severe myalgic phenotype without pareses that is aggravated by the second intronic variant and put these findings in the context of previous studies of the same variants.</p>","PeriodicalId":56106,"journal":{"name":"Neurogenetics","volume":" ","pages":"273-278"},"PeriodicalIF":2.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10545561/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10390337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}