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NMDA receptor gene variations as modifiers in Huntington disease: a replication study
Genetic variations in N-methyl D-aspartate receptor genes GRIN2A and GRIN2B are associated with age at onset in Huntington disease (HD). This study replicated findings and identified new associations in specific patient subgroups.
Area of Science:
- Neurogenetics
- Human Genetics
- Pharmacogenetics
Background:
- Huntington disease (HD) is a neurodegenerative disorder caused by a CAG repeat expansion.
- Age at onset (AO) in HD is influenced by genetic modifiers beyond the primary mutation.
- N-methyl D-aspartate (NMDA) receptor genes are potential candidates for modulating HD progression.
Purpose of the Study:
- To replicate the association of GRIN2A and GRIN2B gene variations with AO in HD.
- To investigate potential associations in specific AO subtypes within the European Huntington Disease Network (EHDN) REGISTRY cohort.
Main Methods:
- Analysis of genetic variations in GRIN2A and GRIN2B genes.
- Utilized the EHDN REGISTRY cohort for replication study.
- Stratified analysis based on age at onset (AO) subtypes.
Main Results:
- Replicated the association between GRIN2A rs2650427 variation and AO in the overall HD cohort.
- Identified nominally significant associations for GRIN2A rs1969060 and GRIN2B rs1806201 variations with AO in specific AO subtypes.
Conclusions:
- NMDA receptor subtype genes (GRIN2A, GRIN2B) contain variations associated with AO in Huntington disease.
- Findings support the role of NMDA receptor pathways in HD pathogenesis and variability.
- Further research into these genetic loci may offer insights into HD therapeutic targets.
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Genetic Lingo

