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Levitin MO, Rawlins LE, Sanchez-Andrade G, Arshad OA, Collins SC, Sawiak SJ, Iffland PH, Andersson MHL, Bupp C, Cambridge EL, Coomber EL, Ellis I, Herkert JC, Ironfield H, Jory L, Kretz PF, Kant SG, Neaverson A, Nibbeling E, Rowley C, Relton E, Sanderson M, Scott EM, Stewart H, Shuen AY, Schreiber J, Tuck L, Tonks J, Terkelsen T, van Ravenswaaij-Arts C, Vasudevan P, Wenger O, Wright M, Day A, Hunter A, Patel M, Lelliott CJ, Crino PB, Yalcin B, Crosby AH, Baple EL, Logan DW, Hurles ME, Gerety SS. Models of KPTN-related disorder implicate mTOR signalling in cognitive and overgrowth phenotypes. Brain 2023; 146:4766-4783. [PMID: 37437211 PMCID: PMC10629792 DOI: 10.1093/brain/awad231] [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: 11/02/2022] [Revised: 05/31/2023] [Accepted: 06/18/2023] [Indexed: 07/14/2023] Open
Abstract
KPTN-related disorder is an autosomal recessive disorder associated with germline variants in KPTN (previously known as kaptin), a component of the mTOR regulatory complex KICSTOR. To gain further insights into the pathogenesis of KPTN-related disorder, we analysed mouse knockout and human stem cell KPTN loss-of-function models. Kptn -/- mice display many of the key KPTN-related disorder phenotypes, including brain overgrowth, behavioural abnormalities, and cognitive deficits. By assessment of affected individuals, we have identified widespread cognitive deficits (n = 6) and postnatal onset of brain overgrowth (n = 19). By analysing head size data from their parents (n = 24), we have identified a previously unrecognized KPTN dosage-sensitivity, resulting in increased head circumference in heterozygous carriers of pathogenic KPTN variants. Molecular and structural analysis of Kptn-/- mice revealed pathological changes, including differences in brain size, shape and cell numbers primarily due to abnormal postnatal brain development. Both the mouse and differentiated induced pluripotent stem cell models of the disorder display transcriptional and biochemical evidence for altered mTOR pathway signalling, supporting the role of KPTN in regulating mTORC1. By treatment in our KPTN mouse model, we found that the increased mTOR signalling downstream of KPTN is rapamycin sensitive, highlighting possible therapeutic avenues with currently available mTOR inhibitors. These findings place KPTN-related disorder in the broader group of mTORC1-related disorders affecting brain structure, cognitive function and network integrity.
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Affiliation(s)
- Maria O Levitin
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Evox Therapeutics Limited, Oxford OX4 4HG, UK
| | - Lettie E Rawlins
- RILD Wellcome Wolfson Medical Research Centre, University of Exeter, Exeter EX2 5DW, UK
- Peninsula Clinical Genetics Service, Royal Devon University Healthcare NHS Foundation Trust, Exeter EX1 2ED, UK
| | | | - Osama A Arshad
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Stephan C Collins
- INSERM Unit 1231, Université de Bourgogne Franche-Comté, Dijon 21078, France
| | - Stephen J Sawiak
- Behavioural and Clinical Neuroscience Institute, University of Cambridge, Cambridge CB2 3EB, UK
- Wolfson Brain Imaging Centre, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Phillip H Iffland
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Malin H L Andersson
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Caleb Bupp
- Spectrum Health, Helen DeVos Children’s Hospital, Grand Rapids, MI 49503, USA
| | - Emma L Cambridge
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Eve L Coomber
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Ian Ellis
- Department of Clinical Genetics, Alder Hey Children’s Hospital, Liverpool L14 5AB, UK
| | - Johanna C Herkert
- Department of Genetics, University Medical Centre, University of Groningen, Groningen 9713 GZ, The Netherlands
| | - Holly Ironfield
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Logan Jory
- Haven Clinical Psychology Practice Ltd, Bude, Cornwall EX23 9HP, UK
| | | | - Sarina G Kant
- Department of Clinical Genetics, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3015 GD, The Netherlands
- Department of Clinical Genetics, Leiden University Medical Center, Leiden 2300 RC, The Netherlands
| | - Alexandra Neaverson
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Open Targets, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Esther Nibbeling
- Laboratory for Diagnostic Genome Analysis, Department of Clinical Genetics, Leiden University Medical Center, Leiden 3015 GD, The Netherlands
| | - Christine Rowley
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Institute of Metabolic Science, Cambridge University, Cambridge CB2 0QQ, UK
| | - Emily Relton
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Faculty of Health and Medical Science, University of Surrey, Guildford GU2 7YH, UK
| | - Mark Sanderson
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Ethan M Scott
- New Leaf Center, Clinic for Special Children, Mount Eaton, OH 44659, USA
| | - Helen Stewart
- Oxford Centre for Genomic Medicine, Oxford University Hospitals NHS Trust, Oxford OX3 7HE, UK
| | - Andrew Y Shuen
- London Health Sciences Centre, London, ON N6A 5W9, Canada
- Division of Medical Genetics, Department of Pediatrics, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5W9, Canada
| | - John Schreiber
- Department of Neurology, Children’s National Medical Center, Washington DC 20007, USA
| | - Liz Tuck
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - James Tonks
- Haven Clinical Psychology Practice Ltd, Bude, Cornwall EX23 9HP, UK
| | - Thorkild Terkelsen
- Department of Clinical Genetics, Aarhus University Hospital, Aarhus DK-8200, Denmark
| | - Conny van Ravenswaaij-Arts
- Department of Genetics, University Medical Centre, University of Groningen, Groningen 9713 GZ, The Netherlands
| | - Pradeep Vasudevan
- Department of Clinical Genetics, University Hospitals of Leicester, Leicester Royal Infirmary, Leicester LE1 7RH, UK
| | - Olivia Wenger
- New Leaf Center, Clinic for Special Children, Mount Eaton, OH 44659, USA
| | - Michael Wright
- Institute of Human Genetics, International Centre for Life, Newcastle upon Tyne NE1 7RU, UK
| | - Andrew Day
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Qkine Ltd., Cambridge CB5 8HW, UK
| | - Adam Hunter
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Minal Patel
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Christopher J Lelliott
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Institute of Metabolic Science, Cambridge University, Cambridge CB2 0QQ, UK
| | - Peter B Crino
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Binnaz Yalcin
- INSERM Unit 1231, Université de Bourgogne Franche-Comté, Dijon 21078, France
| | - Andrew H Crosby
- RILD Wellcome Wolfson Medical Research Centre, University of Exeter, Exeter EX2 5DW, UK
| | - Emma L Baple
- RILD Wellcome Wolfson Medical Research Centre, University of Exeter, Exeter EX2 5DW, UK
- Peninsula Clinical Genetics Service, Royal Devon University Healthcare NHS Foundation Trust, Exeter EX1 2ED, UK
| | - Darren W Logan
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Waltham Petcare Science Institute, Waltham on the Wolds LE14 4RT, UK
| | - Matthew E Hurles
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Open Targets, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - Sebastian S Gerety
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Open Targets, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
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2
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Liaqat K, Bharadwaj T, Shah K, Nasir A, Acharya A, Khan S, Ullah I, Schrauwen I, Ahmad W, Leal SM. Nonsense variant in a consanguineous family expands the phenotype of KPTN gene-related syndrome to include hearing impairment. Clin Genet 2023; 104:499-501. [PMID: 37311648 PMCID: PMC11041622 DOI: 10.1111/cge.14390] [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: 04/11/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/15/2023]
Abstract
A short report with two affected siblings from consanguineous family born with intellectual disability, motor disability, language deficit, and hearing impairment and found to carry biallelic nonsense variant in KPTN gene known to be associated with KPTN gene related syndrome.
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Affiliation(s)
- Khurram Liaqat
- Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology, Columbia University Medical Center, New York, NY, USA
| | - Thashi Bharadwaj
- Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology, Columbia University Medical Center, New York, NY, USA
| | - Khadim Shah
- Department of Biotechnology, COMSATS University Islamabad, Abbottabad Campus, Khyber Pakhtunkhwa, Pakistan
| | - Abdul Nasir
- Department of Anesthesiology, Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Anushree Acharya
- Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology, Columbia University Medical Center, New York, NY, USA
| | - Saadullah Khan
- Department of Biotechnology and Genetic Engineering, Kohat University of Science and Technology, Kohat, Khyber Pakhtunkhwa, Pakistan
| | - Irfan Ullah
- Department of Chemistry, Shaheed Benazir Bhutto University, Sheringal, Upper Dir, Pakistan
| | - Isabelle Schrauwen
- Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology, Columbia University Medical Center, New York, NY, USA
| | - Wasim Ahmad
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, Pakistan
| | - Suzanne M. Leal
- Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology, Columbia University Medical Center, New York, NY, USA
- Institute for Alzheimer’s Disease and the Aging Brain, Columbia University Medical Center, New York, NY
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3
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Long KLP, Muroy SE, Sorooshyari SK, Ko MJ, Jaques Y, Sudmant P, Kaufer D. Transcriptomic profiles of stress susceptibility and resilience in the amygdala and hippocampus. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.08.527777. [PMID: 36798395 PMCID: PMC9934702 DOI: 10.1101/2023.02.08.527777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
A single, severe episode of stress can bring about myriad responses amongst individuals, ranging from cognitive enhancement to debilitating and persistent anxiety; however, the biological mechanisms that contribute to resilience versus susceptibility to stress are poorly understood. The dentate gyrus (DG) of the hippocampus and the basolateral nucleus of the amygdala (BLA) are key limbic regions that are susceptible to the neural and hormonal effects of stress. Previous work has also shown that these regions contribute to individual variability in stress responses; however, the molecular mechanisms underlying the role of these regions in susceptibility and resilience are unknown. In this study, we profiled the transcriptomic signatures of the DG and BLA of rats with divergent behavioral outcomes after a single, severe stressor. We subjected rats to three hours of immobilization with exposure to fox urine and conducted a behavioral battery one week after stress to identify animals that showed persistent, high anxiety-like behavior. We then conducted bulk RNA sequencing of the DG and BLA from susceptible, resilient, and unexposed control rats. Differential gene expression analyses revealed that the molecular signatures separating each of the three groups were distinct and non-overlapping between the DG and BLA. In the amygdala, key genes associated with insulin and hormonal signaling corresponded with vulnerability. Specifically, Inhbb, Rab31 , and Ncoa3 were upregulated in the amygdala of stress-susceptible animals compared to resilient animals. In the hippocampus, increased expression of Cartpt - which encodes a key neuropeptide involved in reward, reinforcement, and stress responses - was strongly correlated with vulnerability to anxiety-like behavior. However, few other genes distinguished stress-susceptible animals from control animals, while a larger number of genes separated stress-resilient animals from control and stress-susceptible animals. Of these, Rnf112, Tbx19 , and UBALD1 distinguished resilient animals from both control and susceptible animals and were downregulated in resilience, suggesting that an active molecular response in the hippocampus facilitates protection from the long-term consequences of severe stress. These results provide novel insight into the mechanisms that bring about individual variability in the behavioral responses to stress and provide new targets for the advancement of therapies for stress-induced neuropsychiatric disorders.
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Horn S, Danyel M, Erdmann N, Boschann F, Gunnarsson C, Biskup S, Juengling J, Potratz C, Prager C, Kaindl AM. Case report: KPTN gene-related syndrome associated with a spectrum of neurodevelopmental anomalies including severe epilepsy. Front Neurol 2023; 13:1113811. [PMID: 36703628 PMCID: PMC9871926 DOI: 10.3389/fneur.2022.1113811] [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: 12/01/2022] [Accepted: 12/15/2022] [Indexed: 01/11/2023] Open
Abstract
Biallelic variants in the kaptin gene KPTN were identified recently in individuals with a novel syndrome referred to as autosomal recessive intellectual developmental disorder 41 (MRT41). MRT41 is characterized by developmental delay, predominantly in language development, behavioral abnormalities, and epilepsy. Only about 15 affected individuals have been described in the literature, all with primary or secondary macrocephaly. Using exome sequencing, we identified three different biallelic variants in KPTN in five affected individuals from three unrelated families. In total, two KPTN variants were already reported as a loss of function variants. A novel splice site variant in KPTN was detected in two unrelated families of this study. The core phenotype with neurodevelopment delay was present in all patients. However, macrocephaly was not present in at least one patient. In total, two patients exhibited developmental and epileptic encephalopathies with generalized tonic-clonic seizures that were drug-resistant in one of them. Thus, we further delineate the KPTN-related syndrome, especially emphasizing the severity of epilepsy phenotypes and difficulties in treatment in patients of our cohort.
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Affiliation(s)
- Svea Horn
- Department of Pediatric Neurology, Charité–Universitätsmedizin Berlin, Berlin, Germany,Center for Chronically Sick Children, Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Magdalena Danyel
- Institute of Medical Genetics and Human Genetics, Charité–Universitätsmedizin Berlin, Berlin, Germany,BIH Biomedical Innovation Academy, BIH Charité Clinician Scientist Program, Berlin Institute of Health at Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Nina Erdmann
- Department of Pediatric Neurology, Charité–Universitätsmedizin Berlin, Berlin, Germany,Center for Chronically Sick Children, Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Felix Boschann
- Institute of Medical Genetics and Human Genetics, Charité–Universitätsmedizin Berlin, Berlin, Germany,BIH Biomedical Innovation Academy, BIH Charité Clinician Scientist Program, Berlin Institute of Health at Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Cecilia Gunnarsson
- Department of Clinical Genetics, Linköping University, Linköping, Sweden,Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden,Centre for Rare Diseases in South East Region of Sweden, Linköping University, Linköping, Sweden
| | | | | | - Cornelia Potratz
- Department of Pediatric Neurology, Charité–Universitätsmedizin Berlin, Berlin, Germany,Center for Chronically Sick Children, Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Christine Prager
- Department of Pediatric Neurology, Charité–Universitätsmedizin Berlin, Berlin, Germany,Center for Chronically Sick Children, Charité–Universitätsmedizin Berlin, Berlin, Germany
| | - Angela M. Kaindl
- Department of Pediatric Neurology, Charité–Universitätsmedizin Berlin, Berlin, Germany,Center for Chronically Sick Children, Charité–Universitätsmedizin Berlin, Berlin, Germany,Institute for Cell Biology and Neurobiology, Charité–Universitätsmedizin Berlin, Berlin, Germany,*Correspondence: Angela M. Kaindl ✉
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5
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Pacio Miguez M, Santos-Simarro F, García-Miñaúr S, Velázquez Fragua R, Del Pozo Á, Solís M, Jiménez Rodríguez C, Rufo-Rabadán V, Fernandez VE, Rueda I, Gomez Del Pozo MV, Gallego N, Lapunzina P, Palomares-Bralo M. Pathogenic variants in KPTN, a rare cause of macrocephaly and intellectual disability. Am J Med Genet A 2020; 182:2222-2225. [PMID: 32808430 DOI: 10.1002/ajmg.a.61778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 06/16/2020] [Accepted: 06/21/2020] [Indexed: 12/20/2022]
Affiliation(s)
- Marta Pacio Miguez
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | - Fernando Santos-Simarro
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
| | - Sixto García-Miñaúr
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
| | | | - Ángela Del Pozo
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - Mario Solís
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | - Carmen Jiménez Rodríguez
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | - Virginia Rufo-Rabadán
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | | | - Inmaculada Rueda
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | | | - Natividad Gallego
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain
| | - Pablo Lapunzina
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
| | - María Palomares-Bralo
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, IdiPaz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
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