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TBC1D24 Mutations in a Sibship with Multifocal Polymyoclonus.
Adeline Ngoh1,2, Jose Bras3,4, Rita Guerreiro3,4
1Neurosciences Unit, University College London, Institute of Child Health, London, UK.
Genetic testing identified compound heterozygous mutations in the TBC1D24 gene in siblings with polymyoclonus and neurodevelopmental delay. This finding expands the known spectrum of TBC1D24-related disorders.
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Molecular genetic technologies have advanced the understanding of rare neurological disorders.
- Myoclonus is a key feature in several genetic neurological conditions.
Purpose of the Study:
- To identify the genetic cause of polymyoclonus and neurodevelopmental delay in a family.
- To investigate the role of TBC1D24 gene mutations in neurological disorders.
Main Methods:
- Whole-exome sequencing was performed on two affected siblings.
- Diagnostic neurometabolic investigations were conducted prior to genetic analysis.
Main Results:
- Compound heterozygous mutations in the TBC1D24 gene were identified in both siblings.
- The identified mutations include a missense change (c.457G>A) and a novel frameshift mutation (c.545del).
- TBC1D24 is known to be associated with epilepsy and hearing loss.
Conclusions:
- TBC1D24-related disorders should be considered in the differential diagnosis of children presenting with polymyoclonus.
- This study expands the phenotypic spectrum associated with TBC1D24 mutations.
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