1
|
Atkinson D, Chamova T, Candayan A, Kastreva K, Asenov O, Litvinenko I, Estrada-Cuzcano A, De Vriendt E, Kukushev G, Tournev I, Jordanova A. Identification and Characterization of Novel Founder Mutations in NDRG1: Refining the Genetic Landscape of Charcot-Marie-Tooth Disease Type 4D in Bulgaria. Int J Mol Sci 2024; 25:9047. [PMID: 39201732 PMCID: PMC11354586 DOI: 10.3390/ijms25169047] [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: 07/18/2024] [Revised: 08/14/2024] [Accepted: 08/16/2024] [Indexed: 09/03/2024] Open
Abstract
Charcot-Marie-Tooth neuropathy type 4D (CMT4D) is a rare genetic disorder of the peripheral nervous system caused by biallelic mutations in the N-Myc Downstream Regulated 1 gene (NDRG1). Patients present with an early onset demyelinating peripheral neuropathy causing severe distal muscle weakness and sensory loss, leading to loss of ambulation and progressive sensorineural hearing loss. The disorder was initially described in the Roma community due to a common founder mutation, and only a handful of disease-causing variants have been described in this gene so far. Here, we present genetic and clinical findings from a large Bulgarian cohort of demyelinating CMT patients harboring recurrent and novel variants in the NDRG1 gene. Notably, two splice-site variants are exclusive to Bulgarian Muslims and reside in ancestral haplotypes, suggesting a founder effect. Functional characterization of these novel variants implicates a loss-of-function mechanism due to shorter gene products. Our findings contribute to a deeper understanding of the genetic and clinical heterogeneity of CMT4D and highlight novel founder mutations in the ethnic minority of Bulgarian Muslims.
Collapse
Affiliation(s)
- Derek Atkinson
- Molecular Neurogenomics Group, VIB Center for Molecular Neurology, VIB, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Teodora Chamova
- Department of Neurology, Medical University-Sofia, 1431 Sofia, Bulgaria
| | - Ayse Candayan
- Molecular Neurogenomics Group, VIB Center for Molecular Neurology, VIB, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Kristina Kastreva
- Department of Neurology, Medical University-Sofia, 1431 Sofia, Bulgaria
| | - Ognian Asenov
- Department of Neurology, Medical University-Sofia, 1431 Sofia, Bulgaria
| | - Ivan Litvinenko
- Department of Pediatrics, Medical University-Sofia, 1431 Sofia, Bulgaria
| | - Alejandro Estrada-Cuzcano
- Molecular Neurogenomics Group, VIB Center for Molecular Neurology, VIB, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Els De Vriendt
- Molecular Neurogenomics Group, VIB Center for Molecular Neurology, VIB, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Georgi Kukushev
- Department of Otorhinolaryngology, Military Medical Academy-Sofia, 1606 Sofia, Bulgaria
| | - Ivailo Tournev
- Department of Neurology, Medical University-Sofia, 1431 Sofia, Bulgaria
- Department of Cognitive Science and Psychology, New Bulgarian University, 1618 Sofia, Bulgaria
| | - Albena Jordanova
- Molecular Neurogenomics Group, VIB Center for Molecular Neurology, VIB, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Department of Medical Chemistry and Biochemistry, Medical University-Sofia, 1431 Sofia, Bulgaria
| |
Collapse
|
2
|
Karakaya T, Turkyilmaz A, Sager G, Inan R, Yarali O, Cebi AH, Akin Y. Molecular characterization of Turkish patients with demyelinating Charcot-Marie-Tooth disease. Neurogenetics 2022; 23:213-221. [DOI: 10.1007/s10048-022-00693-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/04/2022] [Indexed: 10/18/2022]
|
3
|
Genetic Survey of Autosomal Recessive Peripheral Neuropathy Cases Unravels High Genetic Heterogeneity in a Turkish Cohort. Neurol Genet 2022; 8:e656. [PMID: 35198731 DOI: 10.1212/nxg.0000000000000656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|