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Avşar PA, Akçay E, Gürkaş E. Psychotic attack during the clinical course of megalencephalic leukoencephalopathy with subcortical cysts: a case report. Eur Child Adolesc Psychiatry 2024:10.1007/s00787-024-02539-y. [PMID: 39039223 DOI: 10.1007/s00787-024-02539-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 07/16/2024] [Indexed: 07/24/2024]
Abstract
OBJECTIVES Van der Knaap disease or megalencephalic leukoencephalopathy with subcortical cysts (MLC), is a slowly progressive neurodegenerative disease with macrocephaly. We present a case of MLC with a confirmed homozygous MLC1 mutation who presented with a psychotic attack at a very young age. CASE PRESENTATION An 11-year-old girl was admitted to the emergency room with delusions, hallucinations, and irritability. She was diagnosed with MLC at 18 months old. Her psychotic symptoms were improved with the administration of risperidone treatment added to her valproic acid treatment for EEG abnormality. CONCLUSION In this case study we reported the first episode of a psychotic attack during the clinical course of MLC. This case indicates the possibility that MLC influences the onset of the psychotic attack. Further investigation with more patients is needed to identify the relationship.
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Affiliation(s)
- Pınar Aydoğan Avşar
- Department of Child and Adolescent Psychiatry, Alanya Education and Training Hospital, Antalya, Turkey.
| | - Elif Akçay
- Department of Child and Adolescent Psychiatry, Ankara Bilkent City Hospital, Ankara, Turkey
| | - Esra Gürkaş
- Department of Pediatric Neurology, Ankara Bilkent City Hospital, Ankara, Turkey
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2
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Kaur N, Arora K, Radhakrishnan P, Narayanan DL, Shukla A. Intragenic homozygous duplication in HEPACAM is associated with megalencephalic leukoencephalopathy with subcortical cysts type 2A. Neurogenetics 2024; 25:85-91. [PMID: 38280046 DOI: 10.1007/s10048-024-00743-1] [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: 10/16/2023] [Accepted: 01/05/2024] [Indexed: 01/29/2024]
Abstract
Disease-causing variants in HEPACAM are associated with megalencephalic leukoencephalopathy with subcortical cysts 2A (MLC2A, MIM# 613,925, autosomal recessive), and megalencephalic leukoencephalopathy with subcortical cysts 2B, remitting, with or without impaired intellectual development (MLC2B, MIM# 613,926, autosomal dominant). These disorders are characterised by macrocephaly, seizures, motor delay, cognitive impairment, ataxia, and spasticity. Brain magnetic resonance imaging (MRI) in these individuals shows swollen cerebral hemispheric white matter and subcortical cysts, mainly in the frontal and temporal regions. To date, 45 individuals from 39 families are reported with biallelic and heterozygous variants in HEPACAM, causing MLC2A and MLC2B, respectively. A 9-year-old male presented with developmental delay, gait abnormalities, seizures, macrocephaly, dysarthria, spasticity, and hyperreflexia. MRI revealed subcortical cysts with diffuse cerebral white matter involvement. Whole-exome sequencing (WES) in the proband did not reveal any clinically relevant single nucleotide variants. However, copy number variation analysis from the WES data of the proband revealed a copy number of 4 for exons 3 and 4 of HEPACAM. Validation and segregation were done by quantitative PCR which confirmed the homozygous duplication of these exons in the proband and carrier status in both parents. To the best of our knowledge, this is the first report of an intragenic duplication in HEPACAM causing MLC2A.
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Affiliation(s)
- Namanpreet Kaur
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| | - Khyati Arora
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| | - Periyasamy Radhakrishnan
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| | - Dhanya Lakshmi Narayanan
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
- DBT-Wellcome Trust India Alliance Early Career Clinical and Public Health Research Fellow, Hyderabad, India
| | - Anju Shukla
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India.
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3
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Passchier EMJ, Bisseling Q, Helman G, van Spaendonk RML, Simons C, Olsthoorn RCL, van der Veen H, Abbink TEM, van der Knaap MS, Min R. Megalencephalic leukoencephalopathy with subcortical cysts: a variant update and review of the literature. Front Genet 2024; 15:1352947. [PMID: 38487253 PMCID: PMC10938252 DOI: 10.3389/fgene.2024.1352947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 01/29/2024] [Indexed: 03/17/2024] Open
Abstract
The leukodystrophy megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by infantile-onset macrocephaly and chronic edema of the brain white matter. With delayed onset, patients typically experience motor problems, epilepsy and slow cognitive decline. No treatment is available. Classic MLC is caused by bi-allelic recessive pathogenic variants in MLC1 or GLIALCAM (also called HEPACAM). Heterozygous dominant pathogenic variants in GLIALCAM lead to remitting MLC, where patients show a similar phenotype in early life, followed by normalization of white matter edema and no clinical regression. Rare patients with heterozygous dominant variants in GPRC5B and classic MLC were recently described. In addition, two siblings with bi-allelic recessive variants in AQP4 and remitting MLC have been identified. The last systematic overview of variants linked to MLC dates back to 2006. We provide an updated overview of published and novel variants. We report on genetic variants from 508 patients with MLC as confirmed by MRI diagnosis (258 from our database and 250 extracted from 64 published reports). We describe 151 unique MLC1 variants, 29 GLIALCAM variants, 2 GPRC5B variants and 1 AQP4 variant observed in these MLC patients. We include experiments confirming pathogenicity for some variants, discuss particularly notable variants, and provide an overview of recent scientific and clinical insight in the pathophysiology of MLC.
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Affiliation(s)
- Emma M. J. Passchier
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
- Department of Integrative Neurophysiology, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, Netherlands
| | - Quinty Bisseling
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
- Department of Integrative Neurophysiology, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, Netherlands
| | - Guy Helman
- Translational Bioinformatics, Murdoch Children’s Research Institute, The Royal Children’s Hospital, Parkville, VIC, Australia
| | | | - Cas Simons
- Translational Bioinformatics, Murdoch Children’s Research Institute, The Royal Children’s Hospital, Parkville, VIC, Australia
- Centre for Population Genomics, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | | | - Hieke van der Veen
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
- Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, Netherlands
| | - Truus E. M. Abbink
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
| | - Marjo S. van der Knaap
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
- Department of Integrative Neurophysiology, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, Netherlands
| | - Rogier Min
- Department of Child Neurology, Amsterdam Leukodystrophy Center, Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam Neuroscience, Amsterdam, Netherlands
- Department of Integrative Neurophysiology, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, Netherlands
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4
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Chen X, Qu H, Yao Q, Cai X, He T, Zhang X. Case report: Analysis of a gene variant and prenatal diagnosis in a family with megalencephalic leukoencephalopathy with subcortical cysts. Front Neurol 2023; 14:1253398. [PMID: 37928140 PMCID: PMC10622957 DOI: 10.3389/fneur.2023.1253398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 09/18/2023] [Indexed: 11/07/2023] Open
Abstract
Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare inherited cerebral white matter disorder in children. Pathogenic variations in the causative gene MLC1 are found in approximately 76% of patients and are inherited in an autosomal recessive manner. In this study, we identified an IVS2 + 1delG variant in MLC1 in the firstborn girl of a pregnant woman who has the clinical features of MLC, including macrocephaly, motor development delay, progressive functional deterioration, and myelinopathy, whereas no obvious subcortical cysts were observed by magnetic resonance imaging of the brain. The proband is homozygous for the IVS2 + 1delG mutation, which was inherited from the parents. This variant disrupts the donor splice site, causing an abnormal transcript that results in a premature termination codon and produces a truncated protein, which was confirmed to affect splicing by MLC1 cDNA analysis. This variant was also detected in family members, and a prenatal diagnosis for the fetus was undertaken. Eventually, the couple gave birth to an unaffected baby. Furthermore, we conducted a long-term follow-up of the proband's clinical course. This report improves our understanding of the genetic and phenotypic characteristics of MLC and provides a new genetic basis for prenatal diagnosis and genetic counseling.
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Affiliation(s)
- Xi Chen
- Department of Medical Genetics and Prenatal Diagnosis Center, West China Second University Hospital, Sichuan University, Chengdu, China
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
| | - Haibo Qu
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
- Department of Radiology, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Qiang Yao
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
| | - Xiaotang Cai
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
- Department of Rehabilitation, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Tiantian He
- Department of Medical Genetics and Prenatal Diagnosis Center, West China Second University Hospital, Sichuan University, Chengdu, China
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
| | - Xuemei Zhang
- Department of Medical Genetics and Prenatal Diagnosis Center, West China Second University Hospital, Sichuan University, Chengdu, China
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China
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5
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Khalaf-Nazzal R, Dweikat I, Maree M, Alawneh M, Barahmeh M, Doulani RT, Qrareya M, Qadi M, Dudin A. Prevalent MLC1 mutation causing autosomal recessive megalencephalic leukoencephalopathy in consanguineous Palestinian families. Brain Dev 2022; 44:454-461. [PMID: 35440380 DOI: 10.1016/j.braindev.2022.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND Recessive forms of megalencephalic leukoencephalopathy with subcortical cysts (MLC, OMIM 604004) is a rare early-onset leukodystrophy that presents with macrocephaly, seizures, slowly progressive gross motor deterioration, and MRI evidence of diffuse symmetric white matter swelling and subcortical cysts in the anterior temporal and frontoparietal regions. Later in the disease course, significant spasticity and ataxia develop, which may be accompanied by intellectual deterioration. This disease is caused mostly by biallelic pathogenic variants in the MLC1 gene. METHODS In this study, we analysed the clinical and molecular architecture of 6 individuals, belonging to 4 unrelated consanguineous Palestinian families, presenting with consistent MLC features. We sequenced the entire coding and flanking intronic regions of the MLC1 gene. RESULTS In all recruited individuals, we detected one recurrent homozygous splice donor mutation NM_015166.4: c.423 + 1G > A. All parents were heterozygous carriers. The mutation abolishes a highly conserved splice site in humans and other species. In silico splice predictors suggested the loss of a canonical splice donor site (CADD score 33.0. SpliceAI: 0.980). The c.423 + 1G > A variant is rare; it was detected in only 4 heterozygous carriers in gnomAD. CONCLUSION In this study, we identified a recurrent MLC1 variant (c.423 + 1G > A) as the cause of MLC among a group of Palestinian patients originating from a particular region of the country. Cost-effective studies should be performed to evaluate the implementation of carrier screening in adults originating from this region. Our findings have the potential to contribute to improved genetic diagnosis and carrier testing for individuals within this population and the wider community.
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Affiliation(s)
- Reham Khalaf-Nazzal
- Faculty of Medicine, Arab American University of Palestine, Jenin, Palestine.
| | - Imad Dweikat
- Faculty of Medicine, Arab American University of Palestine, Jenin, Palestine
| | - Mosab Maree
- Medicine Department, Faculty of Medicine and Health Sciences, An-Najah National University, and An-Najah National University Hospital, Nablus, Palestine
| | - Maysa Alawneh
- Medicine Department, Faculty of Medicine and Health Sciences, An-Najah National University, and An-Najah National University Hospital, Nablus, Palestine
| | - Myassar Barahmeh
- Biomedical Sciences Department, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Rasha T Doulani
- Clinical Sciences Department, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Mohammad Qrareya
- Clinical Sciences Department, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Mohammad Qadi
- Biomedical Sciences Department, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
| | - Anwar Dudin
- Pediatric Neurology Outpatient Clinic, Ramallah, Palestine
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6
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Sadek AA, Aladawy MA, Mansour TMM, Ibrahim MF, Mohamed MM, Gad EF, Othman AA, Ahmed HA, Kasim AK, Wagdy WM, Hasan MHT, Abdelkreem E. Clinicoradiologic Correlation in 22 Egyptian Children With Megalencephalic Leukoencephalopathy With Subcortical Cysts. J Child Neurol 2022; 37:380-389. [PMID: 35322718 DOI: 10.1177/08830738221078683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare genetic form of cerebral white matter disease whose clinicoradiologic correlation has not been completely understood. In this study, we investigated the association between clinical and brain magnetic resonance imaging (MRI) features in 22 Egyptian children (median age 7 years) with MLC. Gross motor function was assessed using the Gross Motor Function Classification System, and evaluation of brain MRI followed a consistent scoring system. Each parameter of extensive cerebral white matter T2 hyperintensity, moderate-to-severe wide ventricle/enlarged subarachnoid space, and greater than 2 temporal subcortical cysts was significantly associated (P < .05) with worse Gross Motor Function Classification System score, language abnormality, and ataxia. Having >2 parietal subcortical cysts was significantly related to a worse Gross Motor Function Classification System score (P = .04). The current study indicates that patients with MLC manifest signification association between certain brain MRI abnormalities and neurologic features, but this should be confirmed in larger studies.
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Affiliation(s)
- Abdelrahim A Sadek
- Neuropsychiatry Unit, Department of Pediatrics, 68890Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Mohammed A Aladawy
- Neurology Unit, Department of Pediatrics, Faculty of Medicine, 195495Al-Azhar University, Assiut, Egypt
| | - Tarek M M Mansour
- Department of Radio-diagnosis, Faculty of Medicine, 68820Al-Azhar University, Assiut, Egypt
| | - Mohamed F Ibrahim
- Neurology Unit, Department of Pediatrics, Faculty of Medicine, 195495Al-Azhar University, Assiut, Egypt
| | - Montaser M Mohamed
- Department of Pediatrics, 68890Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Eman F Gad
- Department of Pediatrics, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Amr A Othman
- Neuropsychiatry Unit, Department of Pediatrics, 68890Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Hosny A Ahmed
- Neurology Unit, Department of Pediatrics, Faculty of Medicine, 195495Al-Azhar University, Assiut, Egypt
| | - Abdin K Kasim
- Department of Neurosurgery, 68890Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Wael M Wagdy
- Department of Radio-diagnosis, 113328Faculty of Medicine, South Valley University, Qena, Egypt
| | - Mohamed H T Hasan
- Department of Radio-diagnosis, Faculty of Medicine, 68820Al-Azhar University, Cairo, Egypt
| | - Elsayed Abdelkreem
- Department of Pediatrics, 68890Faculty of Medicine, Sohag University, Sohag, Egypt
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7
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Hwang J, Park K, Lee GY, Yoon BY, Kim H, Roh SH, Lee BC, Kim K, Lim HH. Transmembrane topology and oligomeric nature of an astrocytic membrane protein, MLC1. Open Biol 2021; 11:210103. [PMID: 34847774 PMCID: PMC8633789 DOI: 10.1098/rsob.210103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
MLC1 is a membrane protein mainly expressed in astrocytes, and genetic mutations lead to the development of a leukodystrophy, megalencephalic leukoencephalopathy with subcortical cysts disease. Currently, the biochemical properties of the MLC1 protein are largely unknown. In this study, we aimed to characterize the transmembrane (TM) topology and oligomeric nature of the MLC1 protein. Systematic immunofluorescence staining data revealed that the MLC1 protein has eight TM domains and that both the N- and C-terminus face the cytoplasm. We found that MLC1 can be purified as an oligomer and could form a trimeric complex in both detergent micelles and reconstituted proteoliposomes. Additionally, a single-molecule photobleaching experiment showed that MLC1 protein complexes could consist of three MLC1 monomers in the reconstituted proteoliposomes. These results can provide a basis for both the high-resolution structural determination and functional characterization of the MLC1 protein.
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Affiliation(s)
- Junmo Hwang
- Neurovascular Unit Research Group, Korea Brain Research Institute (KBRI), 61 Cheomdan-ro, Dong-gu, Daegu 41068, Republic of Korea
| | - Kunwoong Park
- Neurovascular Unit Research Group, Korea Brain Research Institute (KBRI), 61 Cheomdan-ro, Dong-gu, Daegu 41068, Republic of Korea
| | - Ga-Young Lee
- Brain Research Core Facility, Korea Brain Research Institute (KBRI), Daegu, Republic of Korea
| | - Bo Young Yoon
- Neurovascular Unit Research Group, Korea Brain Research Institute (KBRI), 61 Cheomdan-ro, Dong-gu, Daegu 41068, Republic of Korea
| | - Hyunmin Kim
- School of Biological Science, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Sung Hoon Roh
- School of Biological Science, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Byoung-Cheol Lee
- Neurovascular Unit Research Group, Korea Brain Research Institute (KBRI), 61 Cheomdan-ro, Dong-gu, Daegu 41068, Republic of Korea
| | - Kipom Kim
- Brain Research Core Facility, Korea Brain Research Institute (KBRI), Daegu, Republic of Korea
| | - Hyun-Ho Lim
- Neurovascular Unit Research Group, Korea Brain Research Institute (KBRI), 61 Cheomdan-ro, Dong-gu, Daegu 41068, Republic of Korea,Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Republic of Korea
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8
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Amin M, Vignal C, Hamed AAA, Mohammed IN, Elseed MA, Drunat S, Babai A, Eltaraifee E, Elbadi I, Abubaker R, Mustafa D, Yahia A, Koko M, Osman M, Bakhit Y, Elshafea A, Alsiddig M, Haroun S, Lelay G, Elsayed LEO, Ahmed AE, Boespflug-Tanguy O, Dorboz I. Novel variants causing megalencephalic leukodystrophy in Sudanese families. J Hum Genet 2021; 67:127-132. [PMID: 34504271 DOI: 10.1038/s10038-021-00945-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/12/2021] [Accepted: 05/28/2021] [Indexed: 11/09/2022]
Abstract
Mutations in MLC1 cause megalencephalic leukoencephalopathy with subcortical cysts (MLC), a rare form of leukodystrophy characterized by macrocephaly, epilepsy, spasticity, and slow mental deterioration. Genetic studies of MLC are lacking from many parts of the world, especially in Sub-Saharan Africa. Genomic DNA was extracted for 67 leukodystrophic patients from 43 Sudanese families. Mutations were screened using the NGS panel testing 139 leukodystrophies and leukoencephalopathies causing genes (NextSeq500 Illumina). Five homozygous MLC1 variants were discovered in seven patients from five distinct families, including three consanguineous families from the same region of Sudan. Three variants were missense (c.971 T > G, p.Ile324Ser; c.344 T > C, p.Phe115Ser; and c.881 C > T, p.Pro294Leu), one duplication (c.831_838dupATATCTGT, p.Ser280Tyrfs*8), and one synonymous/splicing-site mutation (c.762 C > T, p.Ser254). The segregation pattern was consistent with autosomal recessive inheritance. The clinical presentation and brain MRI of the seven affected patients were consistent with the diagnosis of MLC1. Due to the high frequency of distinct MLC1 mutations found in our leukodystrophic Sudanese families, we analyzed the coding sequence of MLC1 gene in 124 individuals from the Sudanese genome project in comparison with the 1000-genome project. We found that Sudan has the highest proportion of deleterious variants in MLC1 gene compared with other populations from the 1000-genome project.
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Affiliation(s)
- Mutaz Amin
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan.,Université de Paris, NeuroDiderot, UMR 1141, INSERM, Paris, France
| | - Cedric Vignal
- Unité de Génétique Moleculaire, Departement de Genetique Médicale, APHP, Hopital Robert-Debré, Paris, France
| | - Ahlam A A Hamed
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | | | - Maha A Elseed
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Severine Drunat
- Université de Paris, NeuroDiderot, UMR 1141, INSERM, Paris, France.,Unité de Génétique Moleculaire, Departement de Genetique Médicale, APHP, Hopital Robert-Debré, Paris, France
| | - Arwa Babai
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | | | - Iman Elbadi
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Rayan Abubaker
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Doaa Mustafa
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Ashraf Yahia
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan.,Institut du Cerveau, INSERM U1127, CNRS UMR7225, Sorbonne Université, Paris, France
| | - Mahmoud Koko
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Melka Osman
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Yousuf Bakhit
- Faculty of Dentistry, University of Khartoum, Khartoum, Sudan
| | - Azza Elshafea
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | | | - Sahwah Haroun
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Gurvan Lelay
- Université de Paris, NeuroDiderot, UMR 1141, INSERM, Paris, France
| | | | - Ammar E Ahmed
- Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Odile Boespflug-Tanguy
- Université de Paris, NeuroDiderot, UMR 1141, INSERM, Paris, France.,Neuropediatrie, LEUKOFRANCE, APHP, Hopital Robert-Debré, Paris, France
| | - Imen Dorboz
- Université de Paris, NeuroDiderot, UMR 1141, INSERM, Paris, France.
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9
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de Waard DM, Bugiani M. Astrocyte-Oligodendrocyte-Microglia Crosstalk in Astrocytopathies. Front Cell Neurosci 2020; 14:608073. [PMID: 33328899 PMCID: PMC7710860 DOI: 10.3389/fncel.2020.608073] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 10/16/2020] [Indexed: 12/12/2022] Open
Abstract
Defective astrocyte function due to a genetic mutation can have major consequences for microglia and oligodendrocyte physiology, which in turn affects the white matter integrity of the brain. This review addresses the current knowledge on shared and unique pathophysiological mechanisms of astrocytopathies, including vanishing white matter, Alexander disease, megalencephalic leukoencephalopathy with subcortical cysts, Aicardi-Goutières syndrome, and oculodentodigital dysplasia. The mechanisms of disease include protein accumulation, unbalanced secretion of extracellular matrix proteins, pro- and anti-inflammatory molecules, cytokines and chemokines by astrocytes, as well as an altered gap junctional network and a changed ionic and nutrient homeostasis. Interestingly, the extent to which astrogliosis and microgliosis are present in these astrocytopathies is highly variable. An improved understanding of astrocyte-microglia-oligodendrocyte crosstalk might ultimately lead to the identification of druggable targets for these, currently untreatable, severe conditions.
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Affiliation(s)
| | - Marianna Bugiani
- Department of Pathology, VU Medical center, Amsterdam UMC, Amsterdam, Netherlands
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10
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Shi K, Shi Z, Yan H, Wang X, Yang Y, Xiong H, Gu Q, Wu Y, Jiang Y, Wang J. A Chinese pedigree with Brown-Vialetto-Van Laere syndrome due to two novel mutations of SLC52A2 gene: clinical course and response to riboflavin. BMC MEDICAL GENETICS 2019; 20:76. [PMID: 31064337 PMCID: PMC6505200 DOI: 10.1186/s12881-019-0811-1] [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: 01/14/2019] [Accepted: 04/23/2019] [Indexed: 12/20/2022]
Abstract
Background Brown-Vialetto-Van Laere Syndrome (BVVLS), a rare neurological disorder characterized by motor, sensory, and cranial neuronopathies, is mainly associated with defective riboflavin transporters encoded by SLC52A2 and SLC52A3 genes. Clinical outcomes have been shown to be improved significantly by high-dose riboflavin supplementation. The aim of this study was to identify genetic causes and further evaluate the clinical course and response to riboflavin in a Chinese pedigree with BVVLS. Case presentation We report the novel compound heterozygous variants c.1328G>A p.(Cys443Tyr) and c.1022_1023insC p. (Leu341Profs*103) of SLC52A2 gene in a female proband who presented in our out-patient clinic at the age of one-year-old with progressive mental and motor regression, breath holding, and brain stem dysfunction including facial weakness, hearing loss, dysphagia. Following high-dose riboflavin supplementation, the respiratory insufficiency and mental, motor, and bulbar function improved. However, sensorineural hearing loss was not improved. The missense variant site was highly conserved. Both variants were not found in the population database gnomAD. The two variants were inherited from her mother and father, respectively. Both variants were predicted to be deleterious by Polyphen2, Mutation taster, and SIFT and were classified as likely pathogenic according to the ACMG guideline. Conclusions Two novel pathogenic variations of SLC52A2 gene were firstly found from a Chinese pedigree with BVVLS. Clinical outcomes could be improved by early diagnosis and riboflavin supplementation.
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Affiliation(s)
- Kaili Shi
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.,Department of Neurology, Children's Hospital of Shanxi, Taiyuan, 030013, China
| | - Zhen Shi
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.,Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Peking University First Hospital, Beijing, 100034, China
| | - Huifang Yan
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.,Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Peking University First Hospital, Beijing, 100034, China
| | | | - Yanling Yang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Hui Xiong
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Qiang Gu
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China
| | - Ye Wu
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China.,Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Peking University First Hospital, Beijing, 100034, China
| | - Yuwu Jiang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China. .,Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Peking University First Hospital, Beijing, 100034, China. .,Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, 100034, China.
| | - Jingmin Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, 100034, China. .,Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Peking University First Hospital, Beijing, 100034, China. .,Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, 100034, China.
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11
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Identification in Chinese patients with GLIALCAM mutations of megalencephalic leukoencephalopathy with subcortical cysts and brain pathological study on Glialcam knock-in mouse models. World J Pediatr 2019; 15:454-464. [PMID: 31372844 PMCID: PMC6785595 DOI: 10.1007/s12519-019-00284-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 06/25/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare neurological degenerative disorder caused by the mutations of MLC1 or GLIALCAM with autosomal recessive or autosomal dominant inheritance and a different prognosis, characterized by macrocephaly, delayed motor and cognitive development, and bilateral abnormal signals in cerebral white matter (WM) with or without cysts on magnetic resonance imaging (MRI). This study aimed to reveal the clinical and genetic features of MLC patients with GLIALCAM mutations and to explore the brain pathological characteristics and prognosis of mouse models with different modes of inheritance. METHODS Clinical information and peripheral venous blood were collected from six families. Genetic analysis was performed by Sanger sequencing of GLIALCAM. GlialcamArg92Trp/+ and GlialcamLys68Met/Thr132Asn mouse models were generated based on mutations from patients (c.274C>T(p.Arg92Trp) (c.203A>T(p.Lys68Met), and c.395C>A (p.Thr132Asn))). Brain pathologies of the mouse models at different time points were analyzed. RESULTS Six patients were clinically diagnosed with MLC. Of the six patients, five (Pt1-Pt5) presented with a heterozygous mutation in GLIALCAM (c.274C>T(p.Arg92Trp) or c.275G>C(p.Arg92Pro)) and were diagnosed with MLC2B; the remaining patient (Pt6) with two compound heterozygous mutations in GLIALCAM (c.203A>T (p.Lys68Met) and c.395C>A (p.Thr132Asn)) was diagnosed with MLC2A. The mutation c.275C>G (p.Arg92Pro) has not been reported before. Clinical manifestations of the patient with MLC2A (Pt6) progressed with regression, whereas the course of the five MLC2B patients remained stable or improved. The GlialcamArg92Trp/+ and GlialcamLys68Met/ Thr132Asn mouse models showed vacuolization in the anterior commissural WM at 1 month of age and vacuolization in the cerebellar WM at 3 and 6 months, respectively. At 9 months, the vacuolization of the GlialcamLys68Met/ Thr132Asn mouse model was heavier than that of the GlialcamArg92Trp/+ mouse model. Decreased expression of Glialcam in GlialcamArg92Trp/+ and GlialcamLys68Met/ Thr132Asn mice may contribute to the vacuolization. CONCLUSIONS Clinical and genetic characterization of patients with MLC and GLIALCAM mutations revealed a novel mutation, expanding the spectrum of GLIALCAM mutations. The first Glialcam mouse model with autosomal recessive inheritance and a new Glialcam mouse model with autosomal dominant inheritance were generated. The two mouse models with different modes of inheritance showed different degrees of brain pathological features, which were consistent with the patients' phenotype and further confirmed the pathogenicity of the corresponding mutations.
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12
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Hamilton EMC, Tekturk P, Cialdella F, van Rappard DF, Wolf NI, Yalcinkaya C, Çetinçelik Ü, Rajaee A, Kariminejad A, Paprocka J, Yapici Z, Bošnjak VM, van der Knaap MS. Megalencephalic leukoencephalopathy with subcortical cysts: Characterization of disease variants. Neurology 2018; 90:e1395-e1403. [PMID: 29661901 PMCID: PMC5902784 DOI: 10.1212/wnl.0000000000005334] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/16/2018] [Indexed: 01/08/2023] Open
Abstract
Objective To provide an overview of clinical and MRI characteristics of the different variants of the leukodystrophy megalencephalic leukoencephalopathy with subcortical cysts (MLC) and identify possible differentiating features. Methods We performed an international multi-institutional, cross-sectional observational study of the clinical and MRI characteristics in patients with genetically confirmed MLC. Clinical information was obtained by questionnaires for physicians and retrospective chart review. Results We included 204 patients with classic MLC, 187 of whom had recessive mutations in MLC1 (MLC1 variant) and 17 in GLIALCAM (MLC2A variant) and 38 patients with remitting MLC caused by dominant GLIALCAM mutations (MLC2B variant). We observed a relatively wide variability in neurologic disability among patients with classic MLC. No clinical differences could be identified between patients with MLC1 and MLC2A. Patients with MLC2B invariably had a milder phenotype with preservation of motor function, while intellectual disability and autism were relatively frequent. Systematic MRI review revealed no MRI features that distinguish between MLC1 and MLC2A. Radiologic improvement was observed in all patients with MLC2B and also in 2 patients with MLC1. In MRIs obtained in the early disease stage, absence of signal abnormalities of the posterior limb of the internal capsule and cerebellar white matter and presence of only rarefied subcortical white matter instead of true subcortical cysts were suggestive of MLC2B. Conclusion Clinical and MRI features did not distinguish between classic MLC with MLC1 or GLIALCAM mutations. Absence of signal abnormalities of the internal capsule and cerebellar white matter are MRI findings that point to the remitting phenotype.
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Affiliation(s)
- Eline M C Hamilton
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Pinar Tekturk
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Fia Cialdella
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Diane F van Rappard
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Nicole I Wolf
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Cengiz Yalcinkaya
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Ümran Çetinçelik
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Ahmad Rajaee
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Ariana Kariminejad
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Justyna Paprocka
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Zuhal Yapici
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Vlatka Mejaški Bošnjak
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - Marjo S van der Knaap
- From the Department of Child Neurology and Amsterdam Neuroscience (E.M.C.H., F.C., D.F.v.R., N.I.W., M.S.v.d.K.), VU University Medical Center, Amsterdam, the Netherlands; Division of Child Neurology, Department of Neurology, Istanbul Faculty of Medicine (P.T., Z.Y.), and Division of Child Neurology, Department of Neurology, Cerrahpasa Medical School (C.Y.), Istanbul University; clinical geneticist in private practice (Ü.Ç.), Merkez Mahallesi, İstanbul, Turkey; Kariminejad-Najmabadi Pathology & Genetics Center (A.R., A.K.), Tehran, Iran; Department of Pediatric Neurology (J.P.), School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Department of Neuropediatrics (V.M.B.), Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia; and Department of Functional Genomics (M.S.v.d.K.), Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands.
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Choi SA, Kim SY, Yoon J, Choi J, Park SS, Seong MW, Kim H, Hwang H, Choi JE, Chae JH, Kim KJ, Kim S, Lee YJ, Nam SO, Lim BC. A Unique Mutational Spectrum of MLC1 in Korean Patients With Megalencephalic Leukoencephalopathy With Subcortical Cysts: p.Ala275Asp Founder Mutation and Maternal Uniparental Disomy of Chromosome 22. Ann Lab Med 2017; 37:516-521. [PMID: 28840990 PMCID: PMC5587825 DOI: 10.3343/alm.2017.37.6.516] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 03/18/2017] [Accepted: 06/25/2017] [Indexed: 11/30/2022] Open
Abstract
Background Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare inherited disorder characterized by infantile-onset macrocephaly, slow neurologic deterioration, and seizures. Mutations in the causative gene, MLC1, are found in approximately 75% of patients and are inherited in an autosomal recessive manner. We analyzed MLC1 mutations in five unrelated Korean patients with MLC. Methods Direct Sanger sequencing was used to identify MLC1 mutations. A founder effect of the p.Ala275Asp variant was demonstrated by haplotype analysis using single-nucleotide polymorphic (SNP) markers. Multiple ligation-dependent probe amplification (MLPA) and comparative genomic hybridization plus SNP array were used to detect exonic deletions or uniparental disomy (UPD). Results The most prevalent pathogenic variant was c.824C>A (p.Ala275Asp) found in 7/10 (70%) alleles. Two pathogenic frameshift variants were found: c.135delC (p.Cys46Alafs*12) and c.337_353delinsG (p.Ile113Glyfs*4). Haplotype analysis suggested that the Korean patients with MLC harbored a founder mutation in p.Ala275Asp. The p.(Ile113Glyfs*4) was identified in a homozygous state, and a family study revealed that only the mother was heterozygous for this variant. Further analysis of MLPA and SNP arrays for this patient demonstrated loss of heterozygosity of chromosome 22 without any deletion, indicating UPD. The maternal origin of both chromosomes 22 was demonstrated by haplotype analysis. Conclusions This study is the first to describe the mutational spectrum of Korean patients with MLC, demonstrating a founder effect of the p.Ala275Asp variant. This study also broadens our understanding of the mutational spectrum of MLC1 by demonstrating a homozygous p.(Ile113Glyfs*4) variant resulting from UPD of chromosome 22.
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Affiliation(s)
- Sun Ah Choi
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Soo Yeon Kim
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Jihoo Yoon
- Department of Laboratory Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Joongmoon Choi
- Department of Laboratory Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Sung Sup Park
- Department of Laboratory Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
| | - Moon Woo Seong
- Department of Laboratory Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea.
| | - Hunmin Kim
- Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Hee Hwang
- Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Ji Eun Choi
- Department of Pediatrics, Seoul National University Boramae Medical Center, Seoul, Korea
| | - Jong Hee Chae
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Ki Joong Kim
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Seunghyo Kim
- Department of Pediatrics, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea
| | - Yun Jin Lee
- Department of Pediatrics, Pusan National University Children's Hospital, Pusan National University College of Medicine, Yangsan, Korea
| | - Sang Ook Nam
- Department of Pediatrics, Pusan National University Children's Hospital, Pusan National University College of Medicine, Yangsan, Korea
| | - Byung Chan Lim
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea.
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14
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Wang L, Yu H, Cheng H, He K, Fang Z, Ge L, Cheng T, Jin Y. Deletion of Stk40 impairs definitive erythropoiesis in the mouse fetal liver. Cell Death Dis 2017; 8:e2722. [PMID: 28358362 PMCID: PMC5386544 DOI: 10.1038/cddis.2017.148] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/26/2017] [Accepted: 02/28/2017] [Indexed: 01/09/2023]
Abstract
The serine threonine kinase Stk40 has been shown to involve in mouse embryonic stem cell differentiation, pulmonary maturation and adipocyte differentiation. Here we report that targeted deletion of Stk40 leads to fetal liver hypoplasia and anemia in the mouse embryo. The reduction of erythrocytes in the fetal liver is accompanied by increased apoptosis and compromised erythroid maturation. Stk40-/- fetal liver cells have significantly reduced colony-forming units (CFUs) capable of erythroid differentiation, including burst forming unit-erythroid, CFU-erythroid (CFU-E), and CFU-granulocyte, erythrocyte, megakaryocyte and macrophage, but not CFU-granulocyte/macrophages. Purified Stk40-/- megakaryocyte-erythrocyte progenitors produce substantially fewer CFU-E colonies compared to control cells. Moreover, Stk40-/- fetal liver erythroblasts fail to form normal erythroblastic islands in association with wild type or Stk40-/- macrophages, indicating an intrinsic defect of Stk40-/- erythroblasts. Furthermore, the hematopoietic stem and progenitor cell pool is reduced in Stk40-/- fetal livers but still retains the multi-lineage reconstitution capacity. Finally, comparison of microarray data between wild type and Stk40-/- E14.5 fetal liver cells reveals a potential role of aberrantly activated TNF-α signaling in Stk40 depletion induced dyserythropoiesis with a concomitant increase in cleaved caspase-3 and decrease in Gata1 proteins. Altogether, the identification of Stk40 as a regulator for fetal erythroid maturation and survival provides new clues to the molecular regulation of erythropoiesis and related diseases.
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Affiliation(s)
- Lina Wang
- Laboratory of Molecular Developmental Biology, Shanghai JiaoTong University School of Medicine, Shanghai 200025, China
| | - Hongyao Yu
- Laboratory of Molecular Developmental Biology, Shanghai JiaoTong University School of Medicine, Shanghai 200025, China
| | - Hui Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Tianjin, China
| | - Ke He
- Laboratory of Molecular Developmental Biology, Shanghai JiaoTong University School of Medicine, Shanghai 200025, China
| | - Zhuoqing Fang
- Key Laboratory of Stem Cell Biology, CAS Center for Excellence in Molecular Cell Science, Institute of Health Science, Chinese Academy of Sciences, Shanghai 200032, China
| | - Laixiang Ge
- Laboratory of Molecular Developmental Biology, Shanghai JiaoTong University School of Medicine, Shanghai 200025, China
| | - Tao Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China
- Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Tianjin, China
- Department of Stem Cell & Regenerative Medicine, Peking Union Medical College, Tianjin, China
| | - Ying Jin
- Laboratory of Molecular Developmental Biology, Shanghai JiaoTong University School of Medicine, Shanghai 200025, China
- Key Laboratory of Stem Cell Biology, CAS Center for Excellence in Molecular Cell Science, Institute of Health Science, Chinese Academy of Sciences, Shanghai 200032, China
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