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Ma H, Zhu L, Yang X, Ao M, Zhang S, Guo M, Dai X, Ma X, Zhang X. Genetic and phenotypic analysis of 225 Chinese children with developmental delay and/or intellectual disability using whole-exome sequencing. BMC Genomics 2024; 25:391. [PMID: 38649797 PMCID: PMC11034079 DOI: 10.1186/s12864-024-10279-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 04/02/2024] [Indexed: 04/25/2024] Open
Abstract
Developmental delay (DD), or intellectual disability (ID) is a very large group of early onset disorders that affects 1-2% of children worldwide, which have diverse genetic causes that should be identified. Genetic studies can elucidate the pathogenesis underlying DD/ID. In this study, whole-exome sequencing (WES) was performed on 225 Chinese DD/ID children (208 cases were sequenced as proband-parent trio) who were classified into seven phenotype subgroups. The phenotype and genomic data of patients with DD/ID were further retrospectively analyzed. There were 96/225 (42.67%; 95% confidence interval [CI] 36.15-49.18%) patients were found to have causative single nucleotide variants (SNVs) and small insertions/deletions (Indels) associated with DD/ID based on WES data. The diagnostic yields among the seven subgroups ranged from 31.25 to 71.43%. Three specific clinical features, hearing loss, visual loss, and facial dysmorphism, can significantly increase the diagnostic yield of WES in patients with DD/ID (P = 0.005, P = 0.005, and P = 0.039, respectively). Of note, hearing loss (odds ratio [OR] = 1.86%; 95% CI = 1.00-3.46, P = 0.046) or abnormal brainstem auditory evoked potential (BAEP) (OR = 1.91, 95% CI = 1.02-3.50, P = 0.042) was independently associated with causative genetic variants in DD/ID children. Our findings enrich the variation spectrums of SNVs/Indels associated with DD/ID, highlight the value genetic testing for DD/ID children, stress the importance of BAEP screen in DD/ID children, and help to facilitate early diagnose, clinical management and reproductive decisions, improve therapeutic response to medical treatment.
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Affiliation(s)
- Heqian Ma
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China
| | - Lina Zhu
- Faculty of Pediatrics, The Chinese PLA General Hospital, 100700, Beijing, China
- National Engineering Laboratory for Birth Defects Prevention and Control of Key Technology, 100700, Beijing, China
- Beijing Key Laboratory of Pediatric Organ Failure, 100700, Beijing, China
| | - Xiao Yang
- Faculty of Pediatrics, The Chinese PLA General Hospital, 100700, Beijing, China
- National Engineering Laboratory for Birth Defects Prevention and Control of Key Technology, 100700, Beijing, China
- Beijing Key Laboratory of Pediatric Organ Failure, 100700, Beijing, China
| | - Meng Ao
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China
| | - Shunxiang Zhang
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China
| | - Meizhen Guo
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China
| | - Xuelin Dai
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China
| | - Xiuwei Ma
- Faculty of Pediatrics, The Chinese PLA General Hospital, 100700, Beijing, China.
- National Engineering Laboratory for Birth Defects Prevention and Control of Key Technology, 100700, Beijing, China.
- Beijing Key Laboratory of Pediatric Organ Failure, 100700, Beijing, China.
| | - Xiaoying Zhang
- The School of Public Health, Guilin Medical University, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China.
- The Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Heath, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China.
- Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, 1 Zhiyuan Road, Lingui District, 541199, Guilin, PR China.
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Deng X, Yuan L, Jankovic J, Deng H. The role of the PLA2G6 gene in neurodegenerative diseases. Ageing Res Rev 2023; 89:101957. [PMID: 37236368 DOI: 10.1016/j.arr.2023.101957] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 05/12/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023]
Abstract
PLA2G6-associated neurodegeneration (PLAN) represents a continuum of clinically and genetically heterogeneous neurodegenerative disorders with overlapping features. Usually, it encompasses three autosomal recessive diseases, including infantile neuroaxonal dystrophy or neurodegeneration with brain iron accumulation (NBIA) 2A, atypical neuronal dystrophy with childhood-onset or NBIA2B, and adult-onset dystonia-parkinsonism form named PARK14, and possibly a certain subtype of hereditary spastic paraplegia. PLAN is caused by variants in the phospholipase A2 group VI gene (PLA2G6), which encodes an enzyme involved in membrane homeostasis, signal transduction, mitochondrial dysfunction, and α-synuclein aggregation. In this review, we discuss PLA2G6 gene structure and protein, functional findings, genetic deficiency models, various PLAN disease phenotypes, and study strategies in the future. Our primary aim is to provide an overview of genotype-phenotype correlations of PLAN subtypes and speculate on the role of PLA2G6 in potential mechanisms underlying these conditions.
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Affiliation(s)
- Xinyue Deng
- Health Management Center, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Department of Neurology, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China
| | - Lamei Yuan
- Health Management Center, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Disease Genome Research Center, Central South University, Changsha 410013, Hunan, China
| | - Joseph Jankovic
- Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston, TX 77030-4202, USA
| | - Hao Deng
- Health Management Center, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Department of Neurology, the Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China; Disease Genome Research Center, Central South University, Changsha 410013, Hunan, China.
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Cheng HL, Chen YJ, Xue YY, Wu ZY, Li HF, Wang N. Clinical Characterization and Founder Effect Analysis in Chinese Patients with Phospholipase A2-Associated Neurodegeneration. Brain Sci 2022; 12:brainsci12050517. [PMID: 35624904 PMCID: PMC9138368 DOI: 10.3390/brainsci12050517] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 04/11/2022] [Accepted: 04/15/2022] [Indexed: 12/04/2022] Open
Abstract
PLA2G6-associated neurodegeneration (PLAN) is a rare autosomal recessive disorder caused by PLA2G6 mutations. This study aimed to investigate the clinical characteristics and mutation spectrum of PLAN and to investigate the founder effects in Chinese PLAN patients. Six Chinese PLAN families were clinically examined in detail and whole-exome sequencing was performed in the probands. Haplotype analysis was performed in five families with the PLA2G6 c.991G > T mutation using 23 single nucleotide polymorphism markers. Furthermore, all previously reported PLA2G6 mutations and patients in China were reviewed to summarize the genetic and clinical features of PLAN. Interestingly, we found that one patient had hereditary spastic paraplegia and showed various atypical clinical characteristics of PLAN, and five patients had a phenotype of parkinsonism. All probands were compound heterozygotes for PLA2G6 variants, including four novel pathogenic/likely pathogenic mutations (c.967G > A, c.1450G > T, c.1631T > C, and c.1915delG) and five known pathogenic mutations. Haplotype analyses revealed that patients carrying PLA2G6 c.991G > T mutations shared a haplotype of 717 kb. The frequencies of psychiatric features, cognitive decline, and myoclonus in Chinese patients with PLA2G6-related parkinsonism were significantly different from those in European patients. Thus, our study expands the clinical and genetic spectrum of PLAN and provides an insightful view of the founder effect to better diagnose and understand the disease.
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Affiliation(s)
- Hao-Ling Cheng
- Department of Neurology, Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; (H.-L.C.); (Y.-J.C.)
| | - Yi-Jun Chen
- Department of Neurology, Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; (H.-L.C.); (Y.-J.C.)
| | - Yan-Yan Xue
- Research Center of Neurology, Key Laboratory of Medical Neurobiology of Zhejiang Province, Department of Neurology, Second Affiliated Hospital of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou 310000, China; (Y.-Y.X.); (Z.-Y.W.)
| | - Zhi-Ying Wu
- Research Center of Neurology, Key Laboratory of Medical Neurobiology of Zhejiang Province, Department of Neurology, Second Affiliated Hospital of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou 310000, China; (Y.-Y.X.); (Z.-Y.W.)
| | - Hong-Fu Li
- Research Center of Neurology, Key Laboratory of Medical Neurobiology of Zhejiang Province, Department of Neurology, Second Affiliated Hospital of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou 310000, China; (Y.-Y.X.); (Z.-Y.W.)
- Correspondence: (H.-F.L.); (N.W.); Tel.: +086-571-87783569 (H.-F.L.); +086-591-87982772 (N.W.)
| | - Ning Wang
- Department of Neurology, Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China; (H.-L.C.); (Y.-J.C.)
- Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou 350005, China
- Correspondence: (H.-F.L.); (N.W.); Tel.: +086-571-87783569 (H.-F.L.); +086-591-87982772 (N.W.)
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Gu Y, Xiang B, Zhu L, Ma X, Chen X, Cai T. Three intellectual disability-associated de novo mutations in MECP2 identified by trio-WES analysis. BMC MEDICAL GENETICS 2020; 21:99. [PMID: 32393352 PMCID: PMC7216709 DOI: 10.1186/s12881-020-01042-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/04/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND To date, at least 746 genes have been identified to cause intellectual disability (ID). Among them, mutations in the Methyl CpG binding protein 2 (MECP2) gene are the leading cause of Rett syndrome and associated ID. METHODS Considering the large number of ID-associated genes, we applied trio-based whole-exome sequencing (trio-WES) and in silico analysis for genetic diagnosis of 294 children with ID. RESULTS Three de novo heterozygous mutations [NM_004992.3: c.502C > T, p.(Arg168*), c.916C > T, p.(Arg306Cys), and c.879C > G, p.(Ile293Met)] in MECP2 were identified in three unrelated girls. The first two mutations were detected in two patients who were diagnosed as typical Rett syndrome, X-linked ID and psychomotor retardation. The third mutation (c.879C > G), a previously unreported, was found in a 6-year-old girl with ID, microcephaly, severe underweight and psychomotor retardation. Particularly, this extremely rare de novo mutation (DNM) is located in the transcriptional repression domain (TRD) of MECP2, where at least 62 different causal mutations are identified. CONCLUSIONS We identified three DNMs in MECP2 in a cohort of 294 individuals with ID. The novel c.879C > G mutation, as a likely pathogenic allele, may become a risk factor associated with X-linked ID, microcephaly and psychomotor retardation.
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Affiliation(s)
- Yi Gu
- Department of Psychiatry, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.,Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Bingwu Xiang
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, 325027, Zhejiang, China
| | - Lina Zhu
- Department of Neurology, Bayi Children's Hospital, General Military Hospital of Beijing, Beijing, 10007, China
| | - Xiuwei Ma
- Department of Neurology, Bayi Children's Hospital, General Military Hospital of Beijing, Beijing, 10007, China
| | - Xiang Chen
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, 325027, Zhejiang, China
| | - Tao Cai
- Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, 20892, USA.
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Ji Y, Li Y, Shi C, Gao Y, Yang J, Liang D, Yang Z, Xu Y. Identification of a novel mutation in PLA2G6 gene and phenotypic heterogeneity analysis of PLA2G6-related neurodegeneration. Parkinsonism Relat Disord 2019; 65:159-164. [PMID: 31196701 DOI: 10.1016/j.parkreldis.2019.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 03/30/2019] [Accepted: 04/01/2019] [Indexed: 10/27/2022]
Abstract
INTRODUCTION This study reports a novel mutation site of the phospholipase A2 group VI (PLA2G6) gene, and analyzes the information of 67 previously published cases to elucidate PLA2G6 phenotype-genotype variations. METHODS We collected clinical data and examined gene mutation sites from one Chinese patient with adult-onset ataxia and her family. Next-generation sequencing (NGS) and Sanger sequencing were used to verify possible mutations. PolyPhen-2, SIFT, and MutationTaster were used to predict their pathogenicity. For analyzing the distribution frequency of the mutation, 597 healthy controls were recruited. We also analyzed the clinical and genetic information of 67 cases from 23 studies in Pubmed database. RESULTS A novel compound heterozygous mutation of the PLA2G6 gene, c.1648delC and c.991G > T, was found in the Chinese patient, and classified as pathogenic. The c.1648delC variation was absent in ExAC, 1000G, dbSNP databases and the 597 healthy controls. Of the 67 cases, 29 presented ataxia. The signs of cerebellar atrophy appeared in the MRIs of most patients, while signs of iron accumulation were absent in older-aged patients with a compound heterozygous mutation. Thirty-eight patients showed no ataxia. A negative or mild extrapyramidal symptom accompanied by a low age, a homogenous mutation, while moderate or severe extrapyramidal symptoms were associated with an old age and a compound heterozygous mutation. CONCLUSION A novel compound heterozygous mutation of the PLA2G6 gene, c.1648delC and c.991G > T, is associated with adult onset ataxia. Phenotype-genotype variations of PLA2G6 are predicted to be caused by the loss of protein or enzyme activity of phospholipase-2.
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Affiliation(s)
- Yan Ji
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Yusheng Li
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Changhe Shi
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Yuan Gao
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Jing Yang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Dongyi Liang
- The Medical College of ZhengZhou University, Zhengzhou, Henan, 450050, China
| | - Zhihua Yang
- The Medical College of ZhengZhou University, Zhengzhou, Henan, 450050, China
| | - Yuming Xu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China.
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Zhang H, Xiang B, Chen H, Chen X, Cai T. A novel deletion mutation in KMT2A identified in a child with ID/DD and blood eosinophilia. BMC MEDICAL GENETICS 2019; 20:38. [PMID: 30841869 PMCID: PMC6402113 DOI: 10.1186/s12881-019-0776-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 02/25/2019] [Indexed: 02/08/2023]
Abstract
Background The KMT2A gene encoded lysine methyltransferase plays an essential role in regulating gene expression during early development and hematopoiesis. To date, 92 different mutations of KMT2A have been curated in the human gene mutation database (HGMD), resulting in Wiedemann-Steiner syndrome (WDSTS) and intellectual disability (ID)/developmental delay (DD). Case presentation In this report, we present a de novo heterozygous deletion mutation [c.74delG; p. (Gly26Alafs*2)] in the KMT2A gene, which was identified by trio-based whole exome sequencing from a 5.5-year-old boy with ID/DD, stereotypic hand movements and blood eosinophilia. Many deleterious germline mutations of KMT2A have been documented to affect development of central nervous system, oral and craniofacial tissues, but not blood eosinophils. Conclusions This is the first report of a rare case with ID/DD as well as eosinophilia, resulting from a previously undescribed null mutation of KMT2A. Our findings expand the phenotypical spectrum in affected individuals with KMT2A mutations, and may shed some insight into the role of KMT2A in eosinophil metabolism. Electronic supplementary material The online version of this article (10.1186/s12881-019-0776-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Haixia Zhang
- Second Xiangya Hospital, Central South University, Changsha, 410002, Hunan, China.,Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Bingwu Xiang
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Hui Chen
- The Second Affiliated Hospital of Wenzhou Medical University, Zhejiang, China
| | - Xiang Chen
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Tao Cai
- Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, 20892, USA.
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Xiong J, Xiang B, Chen X, Cai T. Case report: a novel mutation in ZIC2 in an infant with microcephaly, holoprosencephaly, and arachnoid cyst. Medicine (Baltimore) 2019; 98:e14780. [PMID: 30855487 PMCID: PMC6417543 DOI: 10.1097/md.0000000000014780] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
RATIONALE Holoprosencephaly (HPE) is a severe congenital brain malformation resulting from failed or incomplete forebrain division in early pregnancy. PATIENT CONCERNS In this study, we reported a 9-month old infant girl with mild microcephaly, semilobor HPE, and arachnoid cyst. DIAGNOSES Potential genetic defects were screened directly using trio-case whole exome sequencing (WES) rather than traditional karyotype, microarray, and Sanger sequencing of select genes. OUTCOMES A previous unpublished de novo missense mutation (c.1069C >G, p.H357D) in the 3rd zinc finger domain (ZFD3) of the ZIC2 gene was identified in the affected individual, but not in the parents. Sanger sequencing using specific primers verified the mutation. Extensive bioinformatics analysis confirmed the pathogenicity of this extremely rare mutation. Phenotype-genotype analysis revealed significant correlation between the 3rd zinc-finger domain with semilobor HPE. LESSONS These findings expanded the spectrum of the ZIC2 gene mutations and associated clinical manifestations, which is the first identification of a mutated ZIC2 gene in a Han infant girl with mild microcephaly, semilobor HPE, and arachnoid cyst.
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Affiliation(s)
- Jianjun Xiong
- College of Basic Medical Science, Jiujiang University, Jiujiang, Jiangxi
- Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD
| | - Bingwu Xiang
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Xiang Chen
- Physical Medicine and Rehabilitation Center, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Tao Cai
- Experimental Medicine Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD
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Guo YP, Tang BS, Guo JF. PLA2G6-Associated Neurodegeneration (PLAN): Review of Clinical Phenotypes and Genotypes. Front Neurol 2018; 9:1100. [PMID: 30619057 PMCID: PMC6305538 DOI: 10.3389/fneur.2018.01100] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 12/03/2018] [Indexed: 12/18/2022] Open
Abstract
Phospholipase A2 group VI (PLA2G6)-associated neurodegeneration (PLAN) includes a series of neurodegenerative diseases that result from the mutations in PLA2G6. PLAN has genetic and clinical heterogeneity, with different mutation sites, mutation types and ethnicities and its clinical phenotype is different. The clinical phenotypes and genotypes of PLAN are closely intertwined and vary widely. PLA2G6 encodes a group of VIA calcium-independent phospholipase A2 proteins (iPLA2β), an enzyme involved in lipid metabolism. According to the age of onset and progressive clinical features, PLAN can be classified into the following subtypes: infantile neuroaxonal dystrophy (INAD), atypical neuroaxonal dystrophy (ANAD) and parkinsonian syndrome which contains adult onset dystonia parkinsonism (DP) and autosomal recessive early-onset parkinsonism (AREP). In this review, we present an overview of PLA2G6-associated neurodegeneration in the context of current research.
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Affiliation(s)
- Yu-Pei Guo
- Center for Brain Disorders Research, Capital Medical University and Beijing Institute of Brain Disorders, Beijing, China.,Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Bei-Sha Tang
- Center for Brain Disorders Research, Capital Medical University and Beijing Institute of Brain Disorders, Beijing, China.,Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Center for Medical Genetics, Central South University, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
| | - Ji-Feng Guo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Center for Medical Genetics, Central South University, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
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Koh K, Ichinose Y, Ishiura H, Nan H, Mitsui J, Takahashi J, Sato W, Itoh Y, Hoshino K, Tsuji S, Takiyama Y. PLA2G6-associated neurodegeneration presenting as a complicated form of hereditary spastic paraplegia. J Hum Genet 2018; 64:55-59. [PMID: 30302010 DOI: 10.1038/s10038-018-0519-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/31/2018] [Accepted: 09/14/2018] [Indexed: 11/09/2022]
Abstract
PLA2G6-associated neurodegeneration (PLAN) comprises heterogeneous neurodegenerative disorders, including infantile neuroaxonal dystrophy, neurodegeneration with brain iron accumulation 2B, and Parkinson disease 14 (PARK14). In addition, very recently, PLA2G6 mutations have been reported to represent a phenotype of hereditary spastic paraplegia (HSP). In this study, we screened 383 HSP families to clarify the frequency of PLA2G6 mutations in the Japan Spastic Paraplegia Research Consortium, and revealed the clinical characteristics of HSP with PLA2G6 mutations. We found three families with compound heterozygous mutations of the PLA2G6 gene, c.517 C > T/c.1634A > G, c.662 T > C/c.991 G > T, and c.1187-2 A > G/c.1933C > T, and one family with a homozygous mutation of the PLA2G6 gene, c.1904G > A/c.1904G > A. All three families with compound heterozygous mutations presented a uniform phenotype of a complicated form of HSP with infantile/child-onset spastic paraplegia, cerebellar ataxia, and mental retardation. On the other hand, the family with a homozygous mutation presented a late-onset complicated form of HSP with parkinsonism. This study may extend the clinical and genetic findings for PLAN.
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Affiliation(s)
- Kishin Koh
- Department of Neurology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Yuta Ichinose
- Department of Neurology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Hiroyuki Ishiura
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Haitian Nan
- Department of Neurology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Jun Mitsui
- Department of Molecular Neurology, The University of Tokyo, Tokyo, Japan
| | | | - Wakiro Sato
- Department of Immunology, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yoshiaki Itoh
- Department of Neurology, Osaka City University, Osaka, Japan
| | - Kyoko Hoshino
- Department of Pediatrics, Minamiwakayama Medical Center, Wakayama, Japan
| | - Shoji Tsuji
- Department of Molecular Neurology, The University of Tokyo, Tokyo, Japan.,International University of Health and Welfare Graduate School, Chiba, Japan
| | - Yoshihisa Takiyama
- Department of Neurology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
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Novel PLA2G6 mutations and clinical heterogeneity in Chinese cases with phospholipase A2-associated neurodegeneration. Parkinsonism Relat Disord 2018; 49:88-94. [DOI: 10.1016/j.parkreldis.2018.02.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 01/30/2018] [Accepted: 02/06/2018] [Indexed: 01/17/2023]
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11
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Targeted sequencing and functional analysis reveal brain-size-related genes and their networks in autism spectrum disorders. Mol Psychiatry 2017; 22:1282-1290. [PMID: 28831199 DOI: 10.1038/mp.2017.140] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Revised: 03/31/2017] [Accepted: 05/19/2017] [Indexed: 02/08/2023]
Abstract
Autism spectrum disorder (ASD) represents a set of complex neurodevelopmental disorders with large degrees of heritability and heterogeneity. We sequenced 136 microcephaly or macrocephaly (Mic-Mac)-related genes and 158 possible ASD-risk genes in 536 Chinese ASD probands and detected 22 damaging de novo mutations (DNMs) in 20 genes, including CHD8 and SCN2A, with recurrent events. Nine of the 20 genes were previously reported to harbor DNMs in ASD patients from other populations, while 11 of them were first identified in present study. We combined genetic variations of the 294 sequenced genes from publicly available whole-exome or whole-genome sequencing studies (4167 probands plus 1786 controls) with our Chinese population (536 cases plus 1457 controls) to optimize the power of candidate-gene prioritization. As a result, we prioritized 67 ASD-candidate genes that exhibited significantly higher probabilities of haploinsufficiency and genic intolerance, and significantly interacted and co-expressed with each another, as well as other known ASD-risk genes. Probands with DNMs or rare inherited mutations in the 67 candidate genes exhibited significantly lower intelligence quotients, supporting their strong functional impact. In addition, we prioritized 39 ASD-related Mic-Mac-risk genes, and showed their interaction and co-expression in a functional network that converged on chromatin remodeling, synapse transmission and cell cycle progression. Genes within the three functional subnetworks exhibited distinct and recognizable spatiotemporal-expression patterns in human brains and laminar-expression profiles in the developing neocortex, highlighting their important roles in brain development. Our results indicate some of Mic-Mac-risk genes are involved in ASD.
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Whole-exome sequencing identifies a novel de novo mutation in DYNC1H1 in epileptic encephalopathies. Sci Rep 2017; 7:258. [PMID: 28325891 PMCID: PMC5428060 DOI: 10.1038/s41598-017-00208-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 02/14/2017] [Indexed: 11/23/2022] Open
Abstract
Epileptic encephalopathies (EE) are a group of severe childhood epilepsy disorders characterized by intractable seizures, cognitive impairment and neurological deficits. Recent whole-exome sequencing (WES) studies have implicated significant contribution of de novo mutations to EE. In this study, we utilized WES for identifying causal de novo mutations in 4 parent-offspring trios affected by West syndrome. As a result, we found two deleterious de novo mutations in DYNC1H1 and RTP1 in two trios. Expression profile analysis showed that DYNC1H1 and RTP1 are expressed in almost all brain regions and developmental stages. Interestingly, co-expression and genetic interaction network analyses suggested that DYNC1H1 and RTP1 are tightly associated with known epilepsy genes. Furthermore, we observed that the de novo mutations of DYNC1H1 were identified in several different neuropsychiatric disorders including EE, autism spectrum disorders and intellectual disabilities by previous studies, and these mutations primarily occurred in the functional domain of the protein. Taken together, these results demonstrate DYNC1H1 as a strong candidate and RTP1 as a potential candidate on the onset of EE. In addition, this work also proves WES as a powerful tool for the molecular genetic dissection of children affected by sporadic EE.
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