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Sidpra J, Sudhakar S, Biswas A, Massey F, Turchetti V, Lau T, Cook E, Alvi JR, Elbendary HM, Jewell JL, Riva A, Orsini A, Vignoli A, Federico Z, Rosenblum J, Schoonjans AS, de Wachter M, Delgado Alvarez I, Felipe-Rucián A, Haridy NA, Haider S, Zaman M, Banu S, Anwaar N, Rahman F, Maqbool S, Yadav R, Salpietro V, Maroofian R, Patel R, Radhakrishnan R, Prabhu SP, Lichtenbelt K, Stewart H, Murakami Y, Löbel U, D’Arco F, Wakeling E, Jones W, Hay E, Bhate S, Jacques TS, Mirsky DM, Whitehead MT, Zaki MS, Sultan T, Striano P, Jansen AC, Lequin M, de Vries LS, Severino M, Edmondson AC, Menzies L, Campeau PM, Houlden H, McTague A, Efthymiou S, Mankad K. The clinical and genetic spectrum of inherited glycosylphosphatidylinositol deficiency disorders. Brain 2024; 147:2775-2790. [PMID: 38456468 PMCID: PMC11292905 DOI: 10.1093/brain/awae056] [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: 10/06/2023] [Revised: 12/31/2023] [Accepted: 01/26/2024] [Indexed: 03/09/2024] Open
Abstract
Inherited glycosylphosphatidylinositol deficiency disorders (IGDs) are a group of rare multisystem disorders arising from pathogenic variants in glycosylphosphatidylinositol anchor pathway (GPI-AP) genes. Despite associating 24 of at least 31 GPI-AP genes with human neurogenetic disease, prior reports are limited to single genes without consideration of the GPI-AP as a whole and with limited natural history data. In this multinational retrospective observational study, we systematically analyse the molecular spectrum, phenotypic characteristics and natural history of 83 individuals from 75 unique families with IGDs, including 70 newly reported individuals; the largest single cohort to date. Core clinical features were developmental delay or intellectual disability (DD/ID, 90%), seizures (83%), hypotonia (72%) and motor symptoms (64%). Prognostic and biologically significant neuroimaging features included cerebral atrophy (75%), cerebellar atrophy (60%), callosal anomalies (57%) and symmetric restricted diffusion of the central tegmental tracts (60%). Sixty-one individuals had multisystem involvement including gastrointestinal (66%), cardiac (19%) and renal (14%) anomalies. Though dysmorphic features were appreciated in 82%, no single dysmorphic feature had a prevalence >30%, indicating substantial phenotypic heterogeneity. Follow-up data were available for all individuals, 15 of whom were deceased at the time of writing. Median age at seizure onset was 6 months. Individuals with variants in synthesis stage genes of the GPI-AP exhibited a significantly shorter time to seizure onset than individuals with variants in transamidase and remodelling stage genes of the GPI-AP (P = 0.046). Forty individuals had intractable epilepsy. The majority of individuals experienced delayed or absent speech (95%), motor delay with non-ambulance (64%), and severe-to-profound DD/ID (59%). Individuals with a developmental epileptic encephalopathy (51%) were at greater risk of intractable epilepsy (P = 0.003), non-ambulance (P = 0.035), ongoing enteral feeds (P < 0.001) and cortical visual impairment (P = 0.007). Serial neuroimaging showed progressive cerebral volume loss in 87.5% and progressive cerebellar atrophy in 70.8%, indicating a neurodegenerative process. Genetic analyses identified 93 unique variants (106 total), including 22 novel variants. Exploratory analyses of genotype-phenotype correlations using unsupervised hierarchical clustering identified novel genotypic predictors of clinical phenotype and long-term outcome with meaningful implications for management. In summary, we expand both the mild and severe phenotypic extremities of the IGDs, provide insights into their neurological basis, and vitally, enable meaningful genetic counselling for affected individuals and their families.
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Affiliation(s)
- Jai Sidpra
- Developmental Biology and Cancer Section, University College London Great Ormond Street Institute of Child Health, London WC1N 1EH, UK
| | - Sniya Sudhakar
- Department of Neuroradiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Asthik Biswas
- Department of Neuroradiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Flavia Massey
- Unit of Functional Neurosurgery, National Hospital for Neurology and Neurosurgery, London WC1N 3BG, UK
| | - Valentina Turchetti
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Tracy Lau
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Edward Cook
- Division of Human Genetics, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Javeria Raza Alvi
- Department of Paediatric Neurology, The Children’s Hospital and the University of Child Health Sciences, Lahore, Punjab 54000, Pakistan
| | - Hasnaa M Elbendary
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Dokki, Cairo 12622, Egypt
| | - Jerry L Jewell
- Department of Paediatric Neurology, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Antonella Riva
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova and IRCCS Istituto Giannina Gaslini, 16147 Genova, Italy
| | - Alessandro Orsini
- Department of Paediatric Neurology, University Hospital of Pisa, 56126 Pisa, Italy
| | - Aglaia Vignoli
- Childhood and Adolescence Neurology and Psychiatry Unit, ASST GOM Niguarda, Health Sciences Department, Università degli Studi di Milano, 20142 Milano, Italy
| | - Zara Federico
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova and IRCCS Istituto Giannina Gaslini, 16147 Genova, Italy
- Childhood and Adolescence Neurology and Psychiatry Unit, ASST GOM Niguarda, Health Sciences Department, Università degli Studi di Milano, 20142 Milano, Italy
| | - Jessica Rosenblum
- Department of Clinical Genetics, Antwerp University Hospital, University of Antwerp, 2650 Edegem, Belgium
| | - An-Sofie Schoonjans
- Department of Paediatric Neurology, Antwerp University Hospital, University of Antwerp, 2650 Edegem, Belgium
| | - Matthias de Wachter
- Department of Paediatric Neurology, Antwerp University Hospital, University of Antwerp, 2650 Edegem, Belgium
| | | | - Ana Felipe-Rucián
- Department of Paediatric Neurology, Vall d’Hebron University Hospital, 08035 Barcelona, Spain
| | - Nourelhoda A Haridy
- Department of Neurology, Faculty of Medicine, Assiut University, Assiut 71515, Egypt
| | - Shahzad Haider
- Department of Paediatrics, Wah Medical College NUMS, Wah Cantonment, Punjab 47000, Pakistan
| | - Mashaya Zaman
- Department of Paediatric Neurology and Development, Dr M.R. Khan Shishu Hospital and Institute of Child Health, Dhaka 1216, Bangladesh
| | - Selina Banu
- Department of Paediatric Neurology and Development, Dr M.R. Khan Shishu Hospital and Institute of Child Health, Dhaka 1216, Bangladesh
| | - Najwa Anwaar
- Department of Paediatrics, The Children’s Hospital and the University of Child Health Sciences, Lahore, Punjab 54000, Pakistan
| | - Fatima Rahman
- Department of Paediatrics, The Children’s Hospital and the University of Child Health Sciences, Lahore, Punjab 54000, Pakistan
| | - Shazia Maqbool
- Department of Paediatrics, The Children’s Hospital and the University of Child Health Sciences, Lahore, Punjab 54000, Pakistan
| | - Rashmi Yadav
- Division of Human Genetics, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Vincenzo Salpietro
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Reza Maroofian
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Rajan Patel
- Department of Paediatric Radiology, Texas Children’s Hospital, Baylor College of Medicine, Houston, Houston, TX 77030, USA
| | - Rupa Radhakrishnan
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Sanjay P Prabhu
- Department of Radiology, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Klaske Lichtenbelt
- Department of Clinical Genetics, University Medical Centre Utrecht, 3584 CX Utrecht, The Netherlands
| | - Helen Stewart
- Oxford Centre for Genomic Medicine, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 7HE, UK
| | - Yoshiko Murakami
- Laboratory of Immunoglycobiology, Research Institute for Microbial Diseases, Osaka University, Osaka 565, Japan
| | - Ulrike Löbel
- Department of Neuroradiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Felice D’Arco
- Department of Neuroradiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Emma Wakeling
- Department of Clinical Genetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Wendy Jones
- Department of Clinical Genetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Eleanor Hay
- Department of Clinical Genetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Sanjay Bhate
- Department of Neurology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Thomas S Jacques
- Developmental Biology and Cancer Section, University College London Great Ormond Street Institute of Child Health, London WC1N 1EH, UK
- Department of Histopathology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - David M Mirsky
- Department of Neuroradiology, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Matthew T Whitehead
- Division of Neuroradiology, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Maha S Zaki
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Dokki, Cairo 12622, Egypt
| | - Tipu Sultan
- Department of Paediatric Neurology, The Children’s Hospital and the University of Child Health Sciences, Lahore, Punjab 54000, Pakistan
| | - Pasquale Striano
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova and IRCCS Istituto Giannina Gaslini, 16147 Genova, Italy
| | - Anna C Jansen
- Department of Paediatric Neurology, Antwerp University Hospital, University of Antwerp, 2650 Edegem, Belgium
| | - Maarten Lequin
- Department of Radiology and Nuclear Medicine, University Medical Centre Utrecht, 3584 CX Utrecht, The Netherlands
| | - Linda S de Vries
- Department of Neonatology, University Medical Centre Utrecht, 3584 CX Utrecht, The Netherlands
| | | | - Andrew C Edmondson
- Division of Human Genetics, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lara Menzies
- Department of Clinical Genetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Philippe M Campeau
- Department of Paediatrics, CHU Sainte Justine Research Centre, University of Montreal, Montreal QC H3T 1C5, Canada
| | - Henry Houlden
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Amy McTague
- Department of Neurology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
- Developmental Neurosciences, University College London Great Ormond Street Institute of Child Health, London, WC1N 1EH, UK
| | - Stephanie Efthymiou
- Department of Neuromuscular Disorders, University College London Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Kshitij Mankad
- Developmental Biology and Cancer Section, University College London Great Ormond Street Institute of Child Health, London WC1N 1EH, UK
- Department of Neuroradiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
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2
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Sadamitsu K, Yanagi K, Hasegawa Y, Murakami Y, Low SE, Ooshima D, Matsubara Y, Okamoto N, Kaname T, Hirata H. A novel homozygous variant of the PIGK gene caused by paternal disomy in a patient with neurodevelopmental disorder, cerebellar atrophy, and seizures. J Hum Genet 2024:10.1038/s10038-024-01264-3. [PMID: 38902431 DOI: 10.1038/s10038-024-01264-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/27/2024] [Accepted: 05/30/2024] [Indexed: 06/22/2024]
Abstract
Glycosylphosphatidylinositol (GPI)-anchored proteins are located at the cell surface by a covalent attachment between protein and GPI embedded in the plasma membrane. This attachment is catalyzed by GPI transamidase comprising five subunits (PIGK, PIGS, PIGT, PIGU, and GPAA1) in the endoplasmic reticulum. Loss of either subunit of GPI transamidase eliminates cell surface localization of GPI-anchored proteins. In humans, pathogenic variants in either subunit of GPI transamidase cause neurodevelopmental disorders. However, how the loss of GPI-anchored proteins triggers neurodevelopmental defects remains largely unclear. Here, we identified a novel homozygous variant of PIGK, NM_005482:c.481A > G,p. (Met161Val), in a Japanese female patient with neurodevelopmental delay, hypotonia, cerebellar atrophy, febrile seizures, hearing loss, growth impairment, dysmorphic facial features, and brachydactyly. The missense variant was found heterozygous in her father, but not in her mother. Zygosity analysis revealed that the homozygous PIGK variant in the patient was caused by paternal isodisomy. Rescue experiments using PIGK-deficient CHO cells revealed that the p.Met161Val variant of PIGK reduced GPI transamidase activity. Rescue experiments using pigk mutant zebrafish confirmed that the p.Met161Val variant compromised PIGK function in tactile-evoked motor response. We also demonstrated that axonal localization of voltage-gated sodium channels and concomitant generation of action potentials were impaired in pigk-deficient neurons in zebrafish, suggesting a link between GPI-anchored proteins and neuronal defects. Taken together, the missense p.Met161Val variant of PIGK is a novel pathogenic variant that causes the neurodevelopmental disorder.
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Affiliation(s)
- Kenichiro Sadamitsu
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, Sagamihara, 252-5258, Japan
| | - Kumiko Yanagi
- Department of Genome Medicine, National Center for Child Health and Development, Tokyo, 157-8535, Japan
| | - Yuiko Hasegawa
- Department of Medical Genetics, Osaka Women's and Children's Hospital, Izumi, 594-1101, Japan
| | - Yoshiko Murakami
- Laboratory of Immunoglycobiology, Research Institute for Microbial Diseases, Osaka University, Suita, 565-0871, Japan
| | - Sean E Low
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, Sagamihara, 252-5258, Japan
| | - Daikun Ooshima
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, Sagamihara, 252-5258, Japan
| | - Yoichi Matsubara
- National Center for Child Health and Development, Tokyo, 157-8535, Japan
| | - Nobuhiko Okamoto
- Department of Medical Genetics, Osaka Women's and Children's Hospital, Izumi, 594-1101, Japan
| | - Tadashi Kaname
- Department of Genome Medicine, National Center for Child Health and Development, Tokyo, 157-8535, Japan.
| | - Hiromi Hirata
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, Sagamihara, 252-5258, Japan.
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3
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Bayat A, Lindau T, Aledo-Serrano A, Gil-Nagel A, Barić I, Bartoniček D, Mateševac J, Ramadža DP, Žigman T, Pušeljić S, Dorner S, Bupp C, Devries S, Møller RS. GPI-anchoring disorders and the heart: Is cardiomyopathy an overlooked feature? Clin Genet 2023; 104:598-603. [PMID: 37489290 DOI: 10.1111/cge.14405] [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: 06/26/2023] [Revised: 07/07/2023] [Accepted: 07/09/2023] [Indexed: 07/26/2023]
Abstract
Glycosylphosphatidylinositol anchoring disorders (GPI-ADs) are a subgroup of congenital disorders of glycosylation. GPI biosynthesis requires proteins encoded by over 30 genes of which 24 genes are linked to neurodevelopmental disorders. Patients, especially those with PIGA-encephalopathy, have a high risk of premature mortality which sometimes is attributed to cardiomyopathy. We aimed to explore the occurrence of cardiomyopathy among patients with GPI-ADs and to raise awareness about this potentially lethal feature. Unpublished patients with genetically proven GPI-ADs and cardiomyopathy were identified through an international collaboration and recruited through the respective clinicians. We also reviewed the literature for published patients with cardiomyopathy and GPI-AD and contacted the corresponding authors for additional information. We identified four novel and unrelated patients with GPI-AD and cardiomyopathy. Cardiomyopathy was diagnosed before adulthood and was the cause of early demise in two patients. Only one patients underwent cardiac workup after being diagnosed with a GPI-AD. All were diagnosed with PIGA-encephalopathy and three had a disease-causing variant at the same residue. The literature reports five additional children with GPI-AD related cardiomyopathy, three of which died before adulthood. We have shown that patients with GPI-ADs are at risk of developing cardiomyopathy and that regular cardiac workup with echocardiography is necessary.
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Affiliation(s)
- Allan Bayat
- Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark
- Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Tobias Lindau
- Department of General Pediatrics, Gemeinschaftsklinikum Mittelrhein, Koblenz, Germany
| | - Angel Aledo-Serrano
- Epilepsy Program, Neurology Department, Hospital Ruber Internacional, Madrid, Spain
| | - Antonio Gil-Nagel
- Epilepsy Unit, Neurology Department, Hospital Ruber Internacional, Madrid, Spain
| | - Ivo Barić
- Department of Pediatrics, University Hospital Center, Zagreb, Croatia
- Faculty of Medicine, University Hospital Center, Zagreb, Croatia
| | | | - Josipa Mateševac
- Department of Neurology, University Hospital Center, Zagreb, Croatia
| | - Danijela Petković Ramadža
- Department of Pediatrics, University Hospital Center, Zagreb, Croatia
- Faculty of Medicine, University Hospital Center, Zagreb, Croatia
| | - Tamara Žigman
- Department of Pediatrics, University Hospital Center, Zagreb, Croatia
- Faculty of Medicine, University Hospital Center, Zagreb, Croatia
| | - Silvija Pušeljić
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
- Department of Pediatrics, University Hospital Center Osijek, Osijek, Croatia
| | - Sanja Dorner
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
- Department of Pediatrics, University Hospital Center Osijek, Osijek, Croatia
| | - Caleb Bupp
- Medical Genetics and Genomics at Corewell Health and Helen DeVos Children's Hospital, Grand Rapids, Michigan, USA
| | - Seth Devries
- Department of Pediatric Neurology, Helen DeVos Children's Hospital, Grand Rapids, Michigan, USA
| | - Rikke Steensbjerre Møller
- Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark
- Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
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4
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Xu Y, Li T, Zhou Z, Hong J, Chao Y, Zhu Z, Zhang Y, Qu Q, Li D. Structures of liganded glycosylphosphatidylinositol transamidase illuminate GPI-AP biogenesis. Nat Commun 2023; 14:5520. [PMID: 37684232 PMCID: PMC10491789 DOI: 10.1038/s41467-023-41281-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
Many eukaryotic receptors and enzymes rely on glycosylphosphatidylinositol (GPI) anchors for membrane localization and function. The transmembrane complex GPI-T recognizes diverse proproteins at a signal peptide region that lacks consensus sequence and replaces it with GPI via a transamidation reaction. How GPI-T maintains broad specificity while preventing unintentional cleavage is unclear. Here, substrates- and products-bound human GPI-T structures identify subsite features that enable broad proprotein specificity, inform catalytic mechanism, and reveal a multilevel safeguard mechanism against its promiscuity. In the absence of proproteins, the catalytic site is invaded by a locally stabilized loop. Activation requires energetically unfavorable rearrangements that transform the autoinhibitory loop into crucial catalytic cleft elements. Enzyme-proprotein binding in the transmembrane and luminal domains respectively powers the conformational rearrangement and induces a competent cleft. GPI-T thus integrates various weak specificity regions to form strong selectivity and prevent accidental activation. These findings provide important mechanistic insights into GPI-anchored protein biogenesis.
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Affiliation(s)
- Yidan Xu
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences (CAS), University of CAS, Shanghai, China
| | - Tingting Li
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences (CAS), University of CAS, Shanghai, China
| | - Zixuan Zhou
- Shanghai Stomatological Hospital, School of Stomatology, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Department of Systems Biology for Medicine, Fudan University, Shanghai, China
| | - Jingjing Hong
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences (CAS), University of CAS, Shanghai, China
| | - Yulin Chao
- Shanghai Stomatological Hospital, School of Stomatology, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Department of Systems Biology for Medicine, Fudan University, Shanghai, China
| | - Zhini Zhu
- Shanghai Stomatological Hospital, School of Stomatology, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Department of Systems Biology for Medicine, Fudan University, Shanghai, China
| | - Ying Zhang
- Shanghai Stomatological Hospital, School of Stomatology, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Department of Systems Biology for Medicine, Fudan University, Shanghai, China
| | - Qianhui Qu
- Shanghai Stomatological Hospital, School of Stomatology, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Department of Systems Biology for Medicine, Fudan University, Shanghai, China.
| | - Dianfan Li
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences (CAS), University of CAS, Shanghai, China.
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Fontana P, Budillon A, Simeone D, Del Vecchio Blanco F, Caiazza M, D'Amico A, Lonardo F, Nigro V, Limongelli G, Scarano G. A Novel Homozygous GPAA1 Variant in a Patient with a Glycosylphosphatidylinositol Biosynthesis Defect. Genes (Basel) 2023; 14:1444. [PMID: 37510348 PMCID: PMC10379968 DOI: 10.3390/genes14071444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/11/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023] Open
Abstract
Glycosylphosphatidylinositol biosynthesis defect 15 is a rare autosomal recessive disorder due to biallelic loss of function of GPAA1. At the moment, less than twenty patients have been reported, usually compound heterozygous for GPAA1 variants. The main clinical features are intellectual disability, hypotonia, seizures, and cerebellar atrophy. We describe a 4-year-old male with a novel, homozygous variant. The patient presents with typical features, such as developmental delay, hypotonia, seizures, and atypical features, such as macrocephaly, preauricular, and cheek appendages. When he was 15 months, the cerebellum was normal. When he was 33 months old, after the molecular diagnosis, magnetic resonance imaging was repeated, showing cerebellar atrophy. This case extends the clinical spectrum of the GPAA1-related disorder and helps to delineate phenotypic differences with defects of other subunits of the transamidase complex.
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Affiliation(s)
- Paolo Fontana
- Medical Genetics Unit, P.O. Gaetano Rummo, A.O.R.N. San Pio, Via dell'Angelo, 1, 82100 Benevento, Italy
| | - Alberto Budillon
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138 Naples, Italy
| | - Domenico Simeone
- Medical Genetics Unit, P.O. Gaetano Rummo, A.O.R.N. San Pio, Via dell'Angelo, 1, 82100 Benevento, Italy
| | - Francesca Del Vecchio Blanco
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138 Naples, Italy
| | - Martina Caiazza
- Inherited and Rare Cardiovascular Disease Unit, Department of Translational Medical Sciences, University of Campania "Luigi Vanvitelli", Via L. Bianchi, 80131 Naples, Italy
| | - Alessandra D'Amico
- Department of Radiology, "Tortorella" Private Hospital, Via Nicola Aversano, 1, 84124 Salerno, Italy
| | - Fortunato Lonardo
- Medical Genetics Unit, P.O. Gaetano Rummo, A.O.R.N. San Pio, Via dell'Angelo, 1, 82100 Benevento, Italy
| | - Vincenzo Nigro
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138 Naples, Italy
- Telethon Institute of Genetics and Medicine, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Giuseppe Limongelli
- Inherited and Rare Cardiovascular Disease Unit, Department of Translational Medical Sciences, University of Campania "Luigi Vanvitelli", Via L. Bianchi, 80131 Naples, Italy
- Institute of Cardiovascular Sciences, University College of London and St. Bartholomew's Hospital, London WC1E 6DD, UK
| | - Gioacchino Scarano
- Medical Genetics Unit, P.O. Gaetano Rummo, A.O.R.N. San Pio, Via dell'Angelo, 1, 82100 Benevento, Italy
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6
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Mastrangelo M, Gasparri V, Bernardi K, Foglietta S, Ramantani G, Pisani F. Epilepsy Phenotypes of Vitamin B6-Dependent Diseases: An Updated Systematic Review. CHILDREN 2023; 10:children10030553. [PMID: 36980111 PMCID: PMC10047402 DOI: 10.3390/children10030553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/12/2023] [Accepted: 03/13/2023] [Indexed: 03/17/2023]
Abstract
Background: Vitamin B6-dependent epilepsies include treatable diseases responding to pyridoxine or pyridoxal-5Iphosphate (ALDH7A1 deficiency, PNPO deficiency, PLP binding protein deficiency, hyperprolinemia type II and hypophosphatasia and glycosylphosphatidylinositol anchor synthesis defects). Patients and methods: We conducted a systematic review of published pediatric cases with a confirmed molecular genetic diagnosis of vitamin B6-dependent epilepsy according to PRISMA guidelines. Data on demographic features, seizure semiology, EEG patterns, neuroimaging, treatment, and developmental outcomes were collected. Results: 497 published patients fulfilled the inclusion criteria. Seizure onset manifested at 59.8 ± 291.6 days (67.8% of cases in the first month of life). Clonic, tonic-clonic, and myoclonic seizures accounted for two-thirds of the cases, while epileptic spasms were observed in 7.6%. Burst-suppression/suppression-burst represented the most frequently reported specific EEG pattern (14.4%), mainly in PLPB, ALDH7A1, and PNPO deficiency. Pyridoxine was administered to 312 patients (18.5% intravenously, 76.9% orally, 4.6% not specified), and 180 also received antiseizure medications. Pyridoxine dosage ranged between 1 and 55 mg/kg/die. Complete seizure freedom was achieved in 160 patients, while a significant seizure reduction occurred in 38. PLP, lysine-restricted diet, and arginine supplementation were used in a small proportion of patients with variable efficacy. Global developmental delay was established in 30.5% of a few patients in whom neurocognitive tests were performed. Conclusions: Despite the wide variability, the most frequent hallmarks of the epilepsy phenotype in patients with vitamin B6-dependent seizures include generalized or focal motor seizure semiology and a burst suppression/suppression burst pattern in EEG.
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Affiliation(s)
- Mario Mastrangelo
- Child Neurology and Psychiatry Unit, Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy
- Department of Neuroscience/Mental Health, Azienda Ospedaliero-Universitaria Policlinico Umberto I, 00161 Rome, Italy
- Correspondence:
| | - Valentina Gasparri
- Child Neurology and Psychiatry Unit, Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy
| | - Katerina Bernardi
- Child Neurology and Psychiatry Unit, Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy
| | - Silvia Foglietta
- Child Neurology and Psychiatry Unit, Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy
| | - Georgia Ramantani
- Department of Neuropediatrics, University Children’s Hospital Zurich and University of Zurich, 8032 Zurich, Switzerland
| | - Francesco Pisani
- Child Neurology and Psychiatry Unit, Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy
- Department of Neuroscience/Mental Health, Azienda Ospedaliero-Universitaria Policlinico Umberto I, 00161 Rome, Italy
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7
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Musante L, Faletra F, Meier K, Tomoum H, Najarzadeh Torbati P, Blair E, North S, Gärtner J, Diegmann S, Beiraghi Toosi M, Ashrafzadeh F, Ghayoor Karimiani E, Murphy D, Murru FM, Zanus C, Magnolato A, La Bianca M, Feresin A, Girotto G, Gasparini P, Costa P, Carrozzi M. TTC5 syndrome: Clinical and molecular spectrum of a severe and recognizable condition. Am J Med Genet A 2022; 188:2652-2665. [PMID: 35670379 PMCID: PMC9541101 DOI: 10.1002/ajmg.a.62852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 03/31/2022] [Accepted: 04/30/2022] [Indexed: 01/24/2023]
Abstract
Biallelic mutations in the TTC5 gene have been associated with autosomal recessive intellectual disability (ARID) and subsequently with an ID syndrome including severe speech impairment, cerebral atrophy, and hypotonia as clinical cornerstones. A TTC5 role in IDs has been proposed based on the physical interaction of TTC5 with p300, and possibly reducing p300 co-activator complex activity, similarly to what was observed in Menke-Hennekam 1 and 2 patients (MKHK1 and 2) carrying, respectively, mutations in exon 30 and 31 of CREBBP and EP300, which code for the TTC5-binding region. Recently, TTC5-related brain malformation has been linked to tubulinopathies due to the function of TTC5 in tubulins' dynamics. We reported seven new patients with novel or recurrent TTC5 variants. The deep characterization of the molecular and phenotypic spectrum confirmed TTC5-related disorder as a recognizable, very severe neurodevelopmental syndrome. In addition, other relevant clinical aspects, including a severe pre- and postnatal growth retardation, cryptorchidism, and epilepsy, have emerged from the reversal phenotype approach and the review of already published TTC5 cases. Microcephaly and facial dysmorphism resulted in being less variable than that documented before. The TTC5 clinical features have been compared with MKHK1 published cases in the hypothesis that clinical overlap in some characteristics of the two conditions was related to the common p300 molecular pathway.
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Affiliation(s)
- Luciana Musante
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Flavio Faletra
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Kolja Meier
- Department of Pediatrics and Adolescent MedicineUniversity Medical Center GöttingenGöttingenGermany
| | - Hoda Tomoum
- Department of PediatricsAin Shams UniversityCairoEgypt
| | | | - Edward Blair
- Oxford Centre for Genomic MedicineOxford University Hospitals NHS Foundation TrustOxfordUK
| | - Sally North
- Oxford Centre for Genomic MedicineOxford University Hospitals NHS Foundation TrustOxfordUK
| | - Jutta Gärtner
- Department of Pediatrics and Adolescent MedicineUniversity Medical Center GöttingenGöttingenGermany
| | - Susann Diegmann
- Department of Pediatrics and Adolescent MedicineUniversity Medical Center GöttingenGöttingenGermany
| | - Mehran Beiraghi Toosi
- Pediatric Neurology Department, Ghaem HospitalMashhad University of Medical SciencesMashhadIran
| | - Farah Ashrafzadeh
- Department of Pediatrics, Faculty of MedicineMashhad University of Medical SciencesMashhadIran
| | - Ehsan Ghayoor Karimiani
- Department of Molecular GeneticsNext Generation Genetic PolyclinicMashhadIran
- Molecular and Clinical Sciences InstituteSt. George's, University of LondonLondonUK
- Innovative Medical Research Center, Mashhad BranchIslamic Azad UniversityMashhadIran
| | - David Murphy
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
| | - Flora Maria Murru
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Caterina Zanus
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Andrea Magnolato
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Martina La Bianca
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Agnese Feresin
- Department of Medical, Surgical and Health SciencesUniversity of TriesteTriesteItaly
| | - Giorgia Girotto
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
- Department of Medical, Surgical and Health SciencesUniversity of TriesteTriesteItaly
| | - Paolo Gasparini
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
- Department of Medical, Surgical and Health SciencesUniversity of TriesteTriesteItaly
| | - Paola Costa
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
| | - Marco Carrozzi
- Institute for Maternal and Child Health ‐ IRCCS “Burlo Garofolo”TriesteItaly
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8
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van der Knoop MM, Maroofian R, Fukata Y, van Ierland Y, Karimiani EG, Lehesjoki AE, Muona M, Paetau A, Miyazaki Y, Hirano Y, Selim L, de França M, Fock RA, Beetz C, Ruivenkamp CAL, Eaton AJ, Morneau-Jacob FD, Sagi-Dain L, Shemer-Meiri L, Peleg A, Haddad-Halloun J, Kamphuis DJ, Peeters-Scholte CMPCD, Kurul SH, Horvath R, Lochmüller H, Murphy D, Waldmüller S, Spranger S, Overberg D, Muir AM, Rad A, Vona B, Abdulwahad F, Maddirevula S, Povolotskaya IS, Voinova VY, Gowda VK, Srinivasan VM, Alkuraya FS, Mefford HC, Alfadhel M, Haack TB, Striano P, Severino M, Fukata M, Hilhorst-Hofstee Y, Houlden H. Biallelic ADAM22 pathogenic variants cause progressive encephalopathy and infantile-onset refractory epilepsy. Brain 2022; 145:2301-2312. [PMID: 35373813 PMCID: PMC9337806 DOI: 10.1093/brain/awac116] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 01/31/2022] [Accepted: 03/04/2022] [Indexed: 12/03/2022] Open
Abstract
Pathogenic variants in A Disintegrin And Metalloproteinase (ADAM) 22, the postsynaptic cell membrane receptor for the glycoprotein leucine-rich repeat glioma-inactivated protein 1 (LGI1), have been recently associated with recessive developmental and epileptic encephalopathy. However, so far, only two affected individuals have been described and many features of this disorder are unknown. We refine the phenotype and report 19 additional individuals harbouring compound heterozygous or homozygous inactivating ADAM22 variants, of whom 18 had clinical data available. Additionally, we provide follow-up data from two previously reported cases. All affected individuals exhibited infantile-onset, treatment-resistant epilepsy. Additional clinical features included moderate to profound global developmental delay/intellectual disability (20/20), hypotonia (12/20) and delayed motor development (19/20). Brain MRI findings included cerebral atrophy (13/20), supported by post-mortem histological examination in patient-derived brain tissue, cerebellar vermis atrophy (5/20), and callosal hypoplasia (4/20). Functional studies in transfected cell lines confirmed the deleteriousness of all identified variants and indicated at least three distinct pathological mechanisms: (i) defective cell membrane expression; (ii) impaired LGI1-binding; and/or (iii) impaired interaction with the postsynaptic density protein PSD-95. We reveal novel clinical and molecular hallmarks of ADAM22 deficiency and provide knowledge that might inform clinical management and early diagnostics.
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Affiliation(s)
- Marieke M van der Knoop
- Department of Child Neurology, Sophia Children’s Hospital, Erasmus University Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Reza Maroofian
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK
| | - Yuko Fukata
- Division of Membrane Physiology, Department of Molecular and Cellular Physiology, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan
- Department of Physiological Sciences, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8585, Japan
| | - Yvette van Ierland
- Department of Clinical Genetics, Erasmus University Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Ehsan G Karimiani
- Next Generation Genetic Polyclinic, Razavi International Hospital, Mashhad, Iran
- Genetics Research Centre, Molecular and Clinical Sciences Institute, St. George’s University, London SW17 0RE, UK
| | - Anna Elina Lehesjoki
- Folkhälsan Research Center, Department of Medical and Clinical Genetics, Medicum, University of Helsinki, Helsinki 00290, Finland
| | - Mikko Muona
- Folkhälsan Research Center, Department of Medical and Clinical Genetics, Medicum, University of Helsinki, Helsinki 00290, Finland
- Department of Medical and Clinical Genetics, Medicum, University of Helsinki, Finland,00100 Helsinki, Finland
- Blueprint Genetics, 02150 Espoo, Finland
| | - Anders Paetau
- Department of Pathology, Medicum, University of Helsinki, 00100 Helsinki, Finland
| | - Yuri Miyazaki
- Division of Membrane Physiology, Department of Molecular and Cellular Physiology, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan
- Department of Physiological Sciences, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8585, Japan
| | - Yoko Hirano
- Division of Membrane Physiology, Department of Molecular and Cellular Physiology, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan
- Department of Pediatrics, Graduate School of Medicine, The University of Tokyo, Bunkyo, Tokyo 113-8655, Japan
| | - Laila Selim
- Division of Neurology and Metabolism, Kasr Al Ainy School of Medicine, Cairo University Children Hospital, Cairo, Egypt
| | - Marina de França
- Department of Morphology and Genetics, Clinical Center of Medical Genetics Federal, University of São Paulo, São Paulo, Brazil
| | - Rodrigo Ambrosio Fock
- Department of Morphology and Genetics, Clinical Center of Medical Genetics Federal, University of São Paulo, São Paulo, Brazil
| | | | - Claudia A L Ruivenkamp
- Department of Clinical Genetics, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
| | - Alison J Eaton
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
| | | | - Lena Sagi-Dain
- Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine Technion-Israel Institute of Technology, Genetics Institute, Carmel Medical Center,Haifa, Israel
| | | | - Amir Peleg
- Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine Technion-Israel Institute of Technology, Genetics Institute, Carmel Medical Center,Haifa, Israel
| | - Jumana Haddad-Halloun
- Department of Biology, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Daan J Kamphuis
- Department of Neurology, Reinier de Graaf Hospital, 2625 AD Delft, The Netherlands
| | | | - Semra Hiz Kurul
- Izmir Biomedicine and Genome Center, Dokuz Eylul University Health Campus, Izmir, Turkey
- Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
- Department of Paediatric Neurology, School of Medicine, Dokuz Eylul University, Izmir, Turkey
| | - Rita Horvath
- Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK
- Department of Clinical Neurosciences, John Van Geest Centre for Brain Repair, School of Clinical Medicine, University of Cambridge, Cambridge, UK
| | - Hanns Lochmüller
- CNAG-CRG, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Barcelona, Spain
- Children’s Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
- Department of Neuropediatrics and Muscle Disorders, Medical Center–University of Freiburg, Faculty of Medicine, Freiburg, Germany
- Division of Neurology, Department of Medicine, The Ottawa Hospital; and Brain and Mind Research Institute, University of Ottawa, Ottawa, Canada
| | - David Murphy
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK
| | - Stephan Waldmüller
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen 72076, Germany
| | | | - David Overberg
- Department of Pediatrics, Klinikum Bremen-Mitte, Bremen 28205, Germany
| | - Alison M Muir
- Division of Genetic Medicine, Department of Pediatrics, University of Washington and Seattle Children’s Hospital, Seattle, WA 98195, USA
| | - Aboulfazl Rad
- Department of Otolaryngology - Head and Neck Surgery, Tübingen Hearing Research Centre, Eberhard Karls University Tübingen, Tübingen 72076, Germany
| | - Barbara Vona
- Department of Otolaryngology - Head and Neck Surgery, Tübingen Hearing Research Centre, Eberhard Karls University Tübingen, Tübingen 72076, Germany
| | - Firdous Abdulwahad
- Department of Translational Genomics, King Faisal Specialist Hospital and Research Center, Riyadh 11564, Saudi Arabia
| | - Sateesh Maddirevula
- Department of Translational Genomics, King Faisal Specialist Hospital and Research Center, Riyadh 11564, Saudi Arabia
| | - Inna S Povolotskaya
- Veltischev Research and Clinical Institute for Pediatrics of the Pirogov Russian National Research Medical University of the Russian Ministry of Health, Moscow, Russia
| | - Victoria Y Voinova
- Veltischev Research and Clinical Institute for Pediatrics of the Pirogov Russian National Research Medical University of the Russian Ministry of Health, Moscow, Russia
- Mental Health Research Center, Moscow 107076, Russia
| | - Vykuntaraju K Gowda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | | | - Fowzan S Alkuraya
- Department of Translational Genomics, King Faisal Specialist Hospital and Research Center, Riyadh 11564, Saudi Arabia
| | - Heather C Mefford
- Division of Genetic Medicine, Department of Pediatrics, University of Washington and Seattle Children’s Hospital, Seattle, WA 98195, USA
| | - Majid Alfadhel
- Genetics and Precision Medicine Department, King Abdullah Specialized Children's Hospital (KASCH), King Abdulaziz Medical City, Ministry of National Guard-Health Affairs (MNG-HA), Riyadh, Saudi Arabia
- Medical Genomics Research Department, King Abdullah International Medical Research Center (KAIMRC), King Saud Bin Abdulaziz University for Health Sciences, King AbdulAziz Medical City, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
| | - Tobias B Haack
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen 72076, Germany
- Centre for Rare Diseases, University of Tübingen, Tübingen 72076, Germany
| | - Pasquale Striano
- IRCCS Istituto Giannina Gaslini, 16147 Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | | | - Masaki Fukata
- Division of Membrane Physiology, Department of Molecular and Cellular Physiology, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan
- Department of Physiological Sciences, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8585, Japan
| | - Yvonne Hilhorst-Hofstee
- Department of Clinical Genetics, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
| | - Henry Houlden
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK
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9
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Ness TJ, Gamage DG, Ekanayaka SA, Hendrickson TL. A Soluble, Minimalistic Glycosylphosphatidylinositol Transamidase (GPI-T) Retains Transamidation Activity. Biochemistry 2022; 61:1273-1285. [PMID: 35730892 DOI: 10.1021/acs.biochem.2c00196] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Glycosylphosphatidylinositol (GPI) anchoring of proteins is a eukaryotic, post-translational modification catalyzed by GPI transamidase (GPI-T). The Saccharomyces cerevisiae GPI-T is composed of five membrane-bound subunits: Gpi8, Gaa1, Gpi16, Gpi17, and Gab1. GPI-T has been recalcitrant to in vitro structure and function studies because of its complexity and membrane-solubility. Furthermore, a reliable, quantitative, in vitro assay for this important post-translational modification has remained elusive despite its discovery more than three decades ago.Three recent reports describe the structure of GPI-T from S. cerevisiae and humans, shedding critical light on this important enzyme and offering insight into the functions of its different subunits. Here, we present the purification and characterization of a truncated soluble GPI-T heterotrimer complex (Gpi823-306, Gaa150-343, and Gpi1620-551) without transmembrane domains. Using this simplified heterotrimer, we report the first quantitative method to measure GPI-T activity in vitro and demonstrate that this soluble, minimalistic GPI-T retains transamidase activity. These results contribute to our understanding of how this enzyme is organized and functions, and provide a method to screen potential GPI-T inhibitors.
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Affiliation(s)
- Travis J Ness
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Dilani G Gamage
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Sandamali A Ekanayaka
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Tamara L Hendrickson
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
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10
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Paprocka J, Hutny M, Hofman J, Tokarska A, Kłaniewska M, Szczałuba K, Stembalska A, Jezela-Stanek A, Śmigiel R. Spectrum of Neurological Symptoms in Glycosylphosphatidylinositol Biosynthesis Defects: Systematic Review. Front Neurol 2022; 12:758899. [PMID: 35058872 PMCID: PMC8763846 DOI: 10.3389/fneur.2021.758899] [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: 08/15/2021] [Accepted: 11/15/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Mutations of genes involved in the synthesis of glycosylphosphatidylinositol and glycosylphosphatidylinositol-anchored proteins lead to rare syndromes called glycosylphosphatidylinositol-anchored proteins biosynthesis defects. Alterations of their structure and function in these disorders impair often fundamental processes in cells, resulting in severe clinical image. This study aimed to provide a systematic review of GPIBD cases reports published in English-language literature. Methods: The browsing of open-access databases (PubMed, PubMed Central. and Medline) was conducted, followed by statistical analysis of gathered information concerning neurological symptomatology. The inclusion criteria were: studies on humans, age at onset (<18 y.o.), and report of GPIBD cases with adequate data on the genetic background and symptomatology. Exclusion criteria were: publication type (manuscripts, personal communication, review articles); reports of cases of GPI biosynthesis genes mutations in terms of other disorders; reports of GPIBD cases concentrating on non-neurological symptoms; or articles concentrating solely on the genetic issues of GPI biosynthesis. Risk of bias was assessed using Joanna Brigs Institute Critical Appraisal Checklists. Data synthesis was conducted using STATISTICA 13.3.721.1 (StatSoft Polska Sp. z.o.o.). Used tests were chi-square, Fisher's exact test (for differences in phenotype), and Mann-Whitney U test (for differences in onset of developmental delay). Results: Browsing returned a total of 973 articles which, after ruling out the repetitions and assessing the inclusion and exclusion criteria, led to final inclusion of 77 articles (337 GPIBD cases) in the analysis. The main outcomes were prevalence of neurological symptoms, onset and semiology of seizures and their response to treatment, and onset of developmental delay. Based on this data a synthesis of phenotypical differences between the groups of GPIBD cases and the general GPIBD cases population was made. Discussion: A synthetical analysis of neurological components in clinical image of GPIBD patients was presented. It highlights the main features of these disorders, which might be useful in clinical practice for consideration in differential diagnosis with children presenting with early-onset seizures and developmental delay. The limitation of this review is the scarcity of the specific data in some reports, concerning the semiology and onset of two main features of GPIBD.
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Affiliation(s)
- Justyna Paprocka
- Department of Pediatric Neurology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Michał Hutny
- Students' Scientific Society, Department of Pediatric Neurology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Jagoda Hofman
- Students' Scientific Society, Department of Pediatric Neurology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Agnieszka Tokarska
- Department of Pediatrics and Developmental Age Neurology, Upper Silesian Child Health Centre, Katowice, Poland
| | | | - Krzysztof Szczałuba
- Department of Medical Genetics, Medical University of Warsaw, Warsaw, Poland
| | | | - Aleksandra Jezela-Stanek
- Department of Genetics and Clinical Immunology, National Institute of Tuberculosis and Lung Diseases, Warsaw, Poland
| | - Robert Śmigiel
- Department of Pediatrics, Medical University of Wroclaw, Wroclaw, Poland
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11
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Palagano E, Gordon CT, Uva P, Strina D, Dimartino C, Villa A, Amiel J, Guion-Almeida ML, Vendramini-Pittoli S, Kokitsu-Nakata NM, Zechi-Ceide RM, Sobacchi C. A novel intronic variant in PIGB in Acrofrontofacionasal dysostosis type 1 patients expands the spectrum of phenotypes associated with GPI biosynthesis defects. Bone 2021; 153:116152. [PMID: 34400385 DOI: 10.1016/j.bone.2021.116152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 11/15/2022]
Abstract
Acrofrontofacionasal dysostosis type 1 (AFFND1) is an extremely rare disorder characterized by several dysmorphic features, skeletal abnormalities and intellectual disability, and described only in seven patients in the literature. A biallelic variant in the Neuroblastoma Amplified Sequence (NBAS) gene was recently identified in two Indian patients with AFFND1. Here we report genetic investigation of AFFND1 in the originally described Brazilian families and the identification of an extremely rare, recessively-inherited, intronic variant in the Phosphatidylinositol Glycan class B (PIGB) gene NC_000015.10 (NM_004855.4): c.795-19T > G) in the affected individuals. The PIGB gene encodes an enzyme involved in the biosynthesis of the glycosylphosphatidylinositol (GPI) anchor, which is required for the post-translational modification of a large variety of proteins, enabling their correct cellular localization and function. Recessive variants in PIGB have previously been reported in individuals with a neurodevelopmental syndrome having partial overlap with AFFND1. In vitro assays demonstrated that the intronic variant leads to exon skipping, suggesting the Brazilian AFFND1 patients may be null for PIGB, in agreement with their severe clinical phenotype. These data increase the number of pathogenic variants in the PIGB gene, place AFFND1 among GPI deficiencies and extend the spectrum of phenotypes associated with GPI biosynthesis defects.
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Affiliation(s)
- Eleonora Palagano
- CNR-IRGB, Milan Unit, Milan, Italy; IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | | | - Paolo Uva
- IRCCS G. Gaslini, Genoa, Italy; Italian Institute of Technology, Genoa, Italy
| | - Dario Strina
- CNR-IRGB, Milan Unit, Milan, Italy; IRCCS Humanitas Research Hospital, Rozzano (MI), Italy
| | | | - Anna Villa
- CNR-IRGB, Milan Unit, Milan, Italy; San Raffaele Telethon Institute for Gene Therapy SR-Tiget, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Jeanne Amiel
- INSERM UMR1163, Institut Imagine, Université de Paris, Paris, France; Service de Génétique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Maria L Guion-Almeida
- Department of Clinical Genetics, Hospital for Rehabilitation of Craniofacial Anomalies (HRCA), University of São Paulo, Bauru, Brazil
| | - Siulan Vendramini-Pittoli
- Department of Clinical Genetics, Hospital for Rehabilitation of Craniofacial Anomalies (HRCA), University of São Paulo, Bauru, Brazil
| | - Nancy M Kokitsu-Nakata
- Department of Clinical Genetics, Hospital for Rehabilitation of Craniofacial Anomalies (HRCA), University of São Paulo, Bauru, Brazil
| | - Roseli M Zechi-Ceide
- Department of Clinical Genetics, Hospital for Rehabilitation of Craniofacial Anomalies (HRCA), University of São Paulo, Bauru, Brazil
| | - Cristina Sobacchi
- CNR-IRGB, Milan Unit, Milan, Italy; IRCCS Humanitas Research Hospital, Rozzano (MI), Italy.
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