A homozygous missense variant, p.Ser166Leu in the PRPF40B gene, in a 7.7 Mb region of homozygosity in a consanguineous Turkish family with essential tremor - Summary - MDSpire
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A homozygous missense variant, p.Ser166Leu in the PRPF40B gene, in a 7.7 Mb region of homozygosity in a consanguineous Turkish family with essential tremor
To identify the genetic basis of essential tremor (ET) in a specific consanguineous Turkish family.
Key Findings:
Identified a homozygous missense variant, p.Ser166Leu, in the PRPF40B gene.
The variant was located within a 7.7 Mb region of homozygosity and segregated with ET in the family, with some members also diagnosed with Parkinson’s Disease.
The mutant PRPF40B showed altered localization to the nuclear membrane compared to wildtype.
Interpretation:
The PRPF40B p.Ser166Leu variant is predicted to alter the function of the protein based on in silico studies, which has been implicated in neurological disorders.
Limitations:
Study limited to a single consanguineous family, which may affect generalizability; broader studies are needed.
Further functional studies are needed to fully understand the impact of the variant.
Conclusion:
The study highlights a potential genetic cause of essential tremor in a Turkish family, contributing to the understanding of the disorder's genetic basis.
Diagnosing Parkinson’s disease has long depended primarily on clinical expertise — careful neurologic examination, longitudinal symptom assessment and the nuanced interpretation of movement abnormalities.
