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Zaki MS, Sharaf-Eldin WE, Rafat K, Elbendary HM, Kamel M, Elkhateeb N, Noureldeen MM, Abdeltawab MA, Sadek AA, Essawi ML, Lau T, Murphy D, Abdel-Hamid MS, Holuden H, Issa MY, Gleeson JG. Clinical and molecular spectrum of a large Egyptian cohort with ALS2-related disorders of infantile-onset of clinical continuum IAHSP/JPLS. Clin Genet 2023. [PMID: 37055917 DOI: 10.1111/cge.14338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 03/10/2023] [Accepted: 03/27/2023] [Indexed: 04/15/2023]
Abstract
This study presents 46 patients from 23 unrelated Egyptian families with ALS2-related disorders without evidence of lower motor neuron involvement. Age at onset ranged from 10 months to 2.5 years, featuring progressive upper motor neuron signs. Detailed clinical phenotypes demonstrated inter- and intrafamilial variability. We identified 16 homozygous disease-causing ALS2 variants; sorted as splice-site, missense, frameshift, nonsense and in-frame in eight, seven, four, three, and one families, respectively. Seven of these variants were novel, expanding the mutational spectrum of the ALS2 gene. As expected, clinical severity was positively correlated with disease onset (p = 0.004). This work provides clinical and molecular profiles of a large single ethnic cohort of patients with ALS2 mutations, and suggests that infantile ascending hereditary spastic paralysis (IAHSP) and juvenile primary lateral sclerosis (JPLS) are belonged to one entity with no phenotype-genotype correlation.
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Affiliation(s)
- Maha S Zaki
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Wessam E Sharaf-Eldin
- Department of Medical Molecular Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Karima Rafat
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Hasnaa M Elbendary
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Mona Kamel
- Department of Pediatrics, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Nour Elkhateeb
- Department of Pediatrics, Faculty of Medicine, Cairo University, Cairo, Egypt
- Department of Clinical Genetics, Cambridge University Hospitals, Cambridge, UK
| | - Mahmoud M Noureldeen
- Department of Pediatrics, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt
| | - Mohamed A Abdeltawab
- Department of Pediatrics, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt
| | - Abdelrahim A Sadek
- Pediatric Neurology Department, Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Mona L Essawi
- Department of Medical Molecular Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Tracy Lau
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, London, UK
| | - David Murphy
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, London, UK
| | - Mohamed S Abdel-Hamid
- Department of Medical Molecular Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Henry Holuden
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, London, UK
| | - Mahmoud Y Issa
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Joseph G Gleeson
- Department of Neurosciences, University of California, San Diego, La Jolla, USA
- Rady Children's Hospital, Rady Children's Institute for Genomic Medicine, San Diego, La Jolla, USA
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