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NR2A and NR2B receptor gene variations modify age at onset in Huntington disease in a sex-specific manner

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Abstract

In addition to the pathogenetic CAG repeat expansion other genetic factors play a significant role in determining age at onset (AO) in Huntington disease (HD), e.g. variations in the NR2A and NR2B glutamate receptor subunit genes (GRIN2A, GRIN2B). In order to expand these findings we fine-mapped a larger HD patient panel (n = 250) using densely spaced markers flanking the originally associated SNPs in GRIN2A and GRIN2B. In GRIN2A association fine-mapping based on eight additional SNPs confirmed intron 2 as the region of strongest association. In GRIN2B fine-mapping with seven additional SNPs consolidated C2664T as causal genetic variation. Gender stratification of patients revealed differences in the variability in AO attributable to the CAG repeat number and highly significant differences in the AO association with the C2664T and rs8057394/ rs2650427 variations. Addition of the corresponding genotype variations to the effect of CAG repeat lengths resulted in a significant increase of the R 2 values only in females. The sex-specific effect for C2664T is underscored by differences in the genotype and allele frequencies observed for female versus male HD patients (P = 0.01) caused by decreased CC frequency in females. Overall, female HD patients homozygous for the CC genotype tended to have later AO compared to the other two genotypes. Stratification of the results by presumed menopausal status demonstrated that the significant findings were predominantly observed in pre-menopausal patients. We speculate that altered hormone levels herald protective effects of this genotype. Together, GRIN2A and GRIN2B genotype variations explain 7.2% additional variance in AO for HD.

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Acknowledgments

We thank Wiebke Hansen for excellent technical assistance. This work was supported by FoRUM grant 821984.

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Authors and Affiliations

  1. Department of Human Genetics, Ruhr-University, 44780, Bochum, Germany

    Larissa Arning, Stefan Wieczorek & Jörg T. Epplen

  2. Department of Neurology, St. Josef Hospital, Ruhr-University, Bochum, Germany

    Carsten Saft, Jürgen Andrich & Peter H. Kraus

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  1. Larissa Arning
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  2. Carsten Saft
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  3. Stefan Wieczorek
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  4. Jürgen Andrich
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  5. Peter H. Kraus
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  6. Jörg T. Epplen
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Correspondence to Larissa Arning.

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Arning, L., Saft, C., Wieczorek, S. et al. NR2A and NR2B receptor gene variations modify age at onset in Huntington disease in a sex-specific manner. Hum Genet 122, 175–182 (2007). https://doi.org/10.1007/s00439-007-0393-4

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  • DOI: https://doi.org/10.1007/s00439-007-0393-4

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