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Milella G, Amati A, Lastella P, Zanfardino P, Petruzzella V, Zoccolella S. A novel mutation in the LRSAM1 gene in a family with early onset autosomal dominant Charcot-Marie-Tooth type 2P. Clin Neurol Neurosurg 2024; 237:108158. [PMID: 38330802 DOI: 10.1016/j.clineuro.2024.108158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/28/2024] [Accepted: 02/01/2024] [Indexed: 02/10/2024]
Abstract
Charcot-Marie-Tooth disease type 2P (CMT2P; MIM #614436) is a specific type of axonal neuropathy caused by mutations in the LRSAM1 gene, which is a RING-type E3 ubiquitin ligase. CMT2P can be inherited in two ways: as an autosomal dominant or autosomal recessive trait. In this report, we describe the clinical characteristics of a family with axonal sensory-motor neuropathy caused by a new variant of the LSRAM1 gene, which is associated with early-onset autosomal dominant CMT2P.
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Affiliation(s)
- Giammarco Milella
- Department of Neurology and Stroke Unit "F.M. Puca", AOU Consorziale Policlinico, Bari, Italy
| | - Alessandro Amati
- Department of Translational Biomedicine and Neurosciences (DiBraiN), University of Bari Aldo Moro, Bari, Italy
| | - Patrizia Lastella
- Rare Disease Center, Internal Medicine Unit "C. Frugoni", AOU Policlinico di Bari, 70124 Bari, Italy
| | - Paola Zanfardino
- Department of Translational Biomedicine and Neurosciences (DiBraiN), University of Bari Aldo Moro, Bari, Italy
| | - Vittoria Petruzzella
- Department of Translational Biomedicine and Neurosciences (DiBraiN), University of Bari Aldo Moro, Bari, Italy.
| | - Stefano Zoccolella
- Neurology Unit, ASL Bari, San Paolo Hospital, Bari, Italy; Center for Neurodegenerative Diseases and the Aging Brain at Pia Fondazione "G. Panico", University of Bari Aldo Moro, Tricase (Lecce), Italy.
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Moiseev D, Wazir Z, Liu D, Li J, Hu B. C698R mutation in Lrsam1 gene impairs nerve regeneration in a CMT2P mouse model. Sci Rep 2022; 12:12160. [PMID: 35842440 PMCID: PMC9288509 DOI: 10.1038/s41598-022-15902-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 06/30/2022] [Indexed: 11/17/2022] Open
Abstract
Missense mutation C694R in the RING domain of the LRSAM1 gene results in a dominantly inherited polyneuropathy, Charcot-Marie-Tooth disease type 2P (CMT2P). We have generated and characterized a Lrsam1C698R knock-in mouse model produced through CRISPR/Cas9 technology. Both heterozygous (Lrsam1+/C698R) and homozygous (Lrsam1C698/C698R) knock-in mice exhibited normal motor functions on behavioral tests as well as normal on nerve conduction studies. Axonal density and myelin thickness were not significantly different between mutants and wild-type mice by sciatic nerve morphometric analysis up to 17 months of age. In line with these normal findings, protein–protein interactions between mutant LRSAM1 and RNA-binding proteins (such as FUS and G3BP1) were still present in mouse cells, which differs from the disrupted interactions between these proteins in human CMT2P cells. However, after crush nerve injury, Lrsam1+/C698R mice had a mild, but statistically significant, reduced compound nerve action potential and conduction velocity during recovery. Therefore, C698R mutation results in a mild impaired nerve regeneration in mice. We speculate that repetitive nerve injuries may, at least partially, contribute to the slowly progressive axonal loss in CMT2P.
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Affiliation(s)
- Daniel Moiseev
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Zafar Wazir
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Donghao Liu
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Jun Li
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA.,Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA.,John D. Dingell VA Medical Center, Detroit, MI, USA.,Department of Neurology, Houston Methodist Research Institute, Houston, TX, USA
| | - Bo Hu
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI, USA. .,Department of Neurology, Houston Methodist Research Institute, Houston, TX, USA.
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