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Angius A, Cossu S, Uva P, Oppo M, Onano S, Persico I, Fotia G, Atzeni R, Cuccuru G, Asunis M, Cucca F, Pruna D, Crisponi L. Novel NALCN biallelic truncating mutations in siblings with IHPRF1 syndrome. Clin Genet 2018; 93:1245-1247. [PMID: 29399786 DOI: 10.1111/cge.13162] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 10/18/2017] [Accepted: 10/22/2017] [Indexed: 11/27/2022]
Abstract
Infantile hypotonia with psychomotor retardation and characteristic facies-1 (IHPRF1) is a severe autosomal recessive neurologic disorder with onset at birth or in early infancy. It is caused by mutations in the NALCN gene that encodes a voltage-independent, cation channel permeable to NM, K+ and Ca2+ and forms a channel complex with UNCSO and UNC79. So far, only 4 homozygous mutations have been found in 11 cases belonging to 4 independent consanguineous families. We studied a Sardinian family with 2 siblings presenting dysmorphic facies, hypotonia, psychomotor retardation, epilepsy, absent speech, sleep disturbance, hyperkinetic movement disorder, cachexia and chronic constipation. Polymorphic generalized seizures started at 4 and 6 years, respectively. Anti-epileptic drugs (AEDs) therapy was efficient for female proband's epilepsy, but the male still has weekly seizures. Whole exome sequencing identified 2 novel truncating mutations in NALCN allowing to assess the clinical phenotype to IHPRF1. This is the fifth family reported worldwide, and these are the first European cases with IHPRF1 syndrome with biallelic truncating mutations of NALCN.
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Affiliation(s)
- A Angius
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy
| | - S Cossu
- Department of Neuroscience and Neuro-Rehabilitation, UOC of Neurosurgery, Pediatric Hospital Bambino Gesù, Rome, Italy
| | - P Uva
- Centre for Advanced Studies, Research and Development in Sardinia (CRS4), Science and Technology Park Polaris, Pula, Italy
| | - M Oppo
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy.,Department of Biomedical Science, University of Sassari, Sassari, Italy
| | - S Onano
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy.,Department of Biomedical Science, University of Sassari, Sassari, Italy
| | - I Persico
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy
| | - G Fotia
- Centre for Advanced Studies, Research and Development in Sardinia (CRS4), Science and Technology Park Polaris, Pula, Italy
| | - R Atzeni
- Centre for Advanced Studies, Research and Development in Sardinia (CRS4), Science and Technology Park Polaris, Pula, Italy
| | - G Cuccuru
- Centre for Advanced Studies, Research and Development in Sardinia (CRS4), Science and Technology Park Polaris, Pula, Italy
| | - M Asunis
- Azienda Ospedaliera Brotzu, SSD of Neurology and Pediatric Epilettology, Cagliari, Italy
| | - F Cucca
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy.,Department of Biomedical Science, University of Sassari, Sassari, Italy
| | - D Pruna
- Azienda Ospedaliera Brotzu, SSD of Neurology and Pediatric Epilettology, Cagliari, Italy
| | - L Crisponi
- Institute of Genetic and Biomedical Research, National Research Council (CNR), Cagliari, Italy.,Department of Biomedical Science, University of Sassari, Sassari, Italy
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