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Ghasemi A, Eslami Ardakani M, Togha M, Yazdi N, Lang AE, Amini E, Rohani M, Alavi A. A Novel Homozygous Variant in the MCOLN1 Gene Associated With Severe Oromandibular Dystonia and Parkinsonism. Can J Neurol Sci 2024:1-9. [PMID: 38532569 DOI: 10.1017/cjn.2024.47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
BACKGROUND Mucolipidosis type IV (MLIV) is a rare, progressive lysosomal storage disorder characterized by severe intellectual disability, delayed motor milestones and ophthalmologic abnormalities. MLIV is an autosomal recessive disease caused by mutations in the MCOLN1 gene, encoding mucolipin-1 which is responsible for maintaining lysosomal function. OBJECTIVES AND METHODS Here, we report a family of four Iranian siblings with cognitive decline, progressive visual and pyramidal disturbances, and abnormal movements manifested by severe oromandibular dystonia and parkinsonism. MRI scans of the brain demonstrated signal abnormalities in the white matter and thinning of the corpus callosum. RESULTS AND CONCLUSIONS Whole-exome sequencing identified a novel homozygous variant, c.362C > T:p. Thr121Met in the MCOLN1 gene consistent with a diagnosis of MLIV. The presentation of MLIV may overlap with a variety of other neurological diseases, and genetic analysis is an important strategy to clarify the diagnosis. This is an important point that clinicians should be familiar with. The novel variant c.362C > T:p. Thr121Met herein described may be related to a comparatively older age at onset. Our study also expands the clinical spectrum of MLIV associated with the MCOLN1 variants and introduces a novel likely pathogenic variant for testing in MLIV cases that remain unresolved.
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Affiliation(s)
- Aida Ghasemi
- Student Research Committee, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
- Genetics research center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
- Neuromuscular Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahdieh Eslami Ardakani
- Neurology Ward, School of Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Mansoureh Togha
- Neurology Ward, School of Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Narges Yazdi
- Department of Neurology, School of Medicine, Rasool Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Anthony E Lang
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, Canada
- Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman. Movement Disorders Clinic, Toronto Western Hospital and Division of Neurology, Toronto, ON, Canada
- Krembil Brain Institute, University Health Network, Toronto, ON, Canada
| | - Elahe Amini
- Department of Neurology, School of Medicine, Rasool Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
- Skull Base Research Center, The Five Senses Health Institute Iran University of Medical Sciences, Tehran, Iran
| | - Mohammad Rohani
- Department of Neurology, School of Medicine, Rasool Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Afagh Alavi
- Genetics research center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
- Neuromuscular Research Center, Tehran University of Medical Sciences, Tehran, Iran
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Gibson D, Brar V, Li R, Kalra A, Goodwin A, Couser N. The High Association of Ophthalmic Manifestations in Individuals With Mucolipidosis Type IV. J Pediatr Ophthalmol Strabismus 2022; 59:332-337. [PMID: 35192386 DOI: 10.3928/01913913-20211206-03] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
PURPOSE To present a case report of mucolipidosis type IV (ML4) and review the literature for all of the ophthalmic abnormalities associated with this disease. METHODS A systematic review of the literature using PubMed/Medline was conducted, and with the addition of the current case report, the eye and ocular adnexa findings of 93 patients with ML4 are summarized. RESULTS The most common ophthalmic findings reported among the 93 patients included corneal clouding (90.3%), strabismus (58.1%), optic nerve pallor (52.2%), retinal dystrophy/pigmentary changes (50.5%), and retinal vascular attenuation (38.9%). Other less commonly reported findings included nystagmus, photophobia, ocular pain, excessive lacrimation, ptosis, and cataracts. CONCLUSIONS The ophthalmic findings discussed in the current case report and literature review serve as indicators for ML4. Early diagnosis of ML4 is important in forming a multidisciplinary management plan, genetic counseling strategy, and maximizing the visual development of affected individuals. [J Pediatr Ophthalmol Strabimus. 2022;59(5):332-337.].
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