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Loss-of-Function Variant in the SMPD1 Gene in Progressive Supranuclear Palsy-Richardson Syndrome Patients of Chinese Ancestry
Shen-Yang Lim, Ai Huey Tan, Jia Nee Foo, Yi Jayne Tan, Elaine GY Chew, Azlina Ahmad Annuar, Alfand Marl Dy Closas, Azalea Pajo, Jia Lun Lim, Yi Wen Tay, Anis Nadhirah, Jia Wei Hor, Tzi Shin Toh, Lei Cheng Lit, Jannah Zulkefli, Su Juen Ngim, Weng Khong Lim, Huw R. Morris, Eng-King Tan, Adeline SL Ng
J Mov Disord. 2024;17(2):213-217.   Published online January 31, 2024
DOI: https://doi.org/10.14802/jmd.24009
  • 2,024 View
  • 66 Download
  • 1 Crossref
AbstractAbstract PDFSupplementary Material
Lysosomal dysfunction plays an important role in neurodegenerative diseases, including Parkinson’s disease (PD) and possibly Parkinson-plus syndromes such as progressive supranuclear palsy (PSP). This role is exemplified by the involvement of variants in the GBA1 gene, which results in a deficiency of the lysosomal enzyme glucocerebrosidase and is the most frequently identified genetic factor underlying PD worldwide. Pathogenic variants in the SMPD1 gene are a recessive cause of Niemann–Pick disease types A and B. Here, we provide the first report on an association between a loss-of-function variant in the SMPD1 gene present in a heterozygous state (p.Pro332Arg/p.P332R, which is known to result in reduced lysosomal acid sphingomyelinase activity), with PSP-Richardson syndrome in three unrelated patients of Chinese ancestry.

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  • Parkinson’s Disease is Predominantly a Genetic Disease
    Shen-Yang Lim, Christine Klein
    Journal of Parkinson's Disease.2024; 14(3): 467.     CrossRef
A KMT2B Frameshift Variant Causing Focal Dystonia Restricted to the Oromandibular Region After Long-Term Follow-up
Alfand Marl F. Dy Closas, Katja Lohmann, Ai Huey Tan, Norlinah Mohamed Ibrahim, Jia Lun Lim, Yi Wen Tay, Kalai Arasu Muthusamy, Azlina Binti Ahmad-Annuar, Christine Klein, Shen-Yang Lim
J Mov Disord. 2023;16(1):91-94.   Published online December 20, 2022
DOI: https://doi.org/10.14802/jmd.22109
  • 1,647 View
  • 96 Download
  • 2 Web of Science
  • 2 Crossref
AbstractAbstract PDFSupplementary Material
KMT2B-linked dystonia (DYT-KMT2B) is a childhood-onset dystonia syndrome typically beginning in the lower limbs and progressing caudocranially to affect the upper limbs with eventual prominent craniocervical involvement. Despite its recent recognition, it now appears to be one of the more common monogenic causes of dystonia syndromes. Here, we present an atypical case of DYT-KMT2B with oromandibular dystonia as the presenting feature, which remained restricted to this region three decades after symptom onset. This appears to be the first reported case of DYT-KMT2B from Southeast Asia and provides further supporting evidence for the pathogenic impact of the KMT2B c.6210_6213delTGAG variant.

Citations

Citations to this article as recorded by  
  • Genetic Update and Treatment for Dystonia
    Jan Koptielow, Emilia Szyłak, Olga Szewczyk-Roszczenko, Piotr Roszczenko, Jan Kochanowicz, Alina Kułakowska, Monika Chorąży
    International Journal of Molecular Sciences.2024; 25(7): 3571.     CrossRef
  • KMT2B-Related Dystonia in Indian Patients With Literature Review and Emphasis on Asian Cohort
    Debjyoti Dhar, Vikram V Holla, Riyanka Kumari, Neeharika Sriram, Jitender Saini, Ravi Yadav, Akhilesh Pandey, Nitish Kamble, Babylakshmi Muthusamy, Pramod Kumar Pal
    Journal of Movement Disorders.2023; 16(3): 285.     CrossRef

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