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. 2012 Jan;2(1):632-7.
doi: 10.1159/000345980. Epub 2012 Dec 15.

Association of BACE1 Gene Polymorphism With Cerebellar Volume but Not Cognitive Function in Normal Individuals

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Free PMC article

Association of BACE1 Gene Polymorphism With Cerebellar Volume but Not Cognitive Function in Normal Individuals

Alex Tsai et al. Dement Geriatr Cogn Dis Extra. .
Free PMC article

Abstract

Aims: β-Site amyloid precursor protein (APP)-cleaving enzyme 1 (BACE1) is a biological and positional candidate gene for Alzheimer's disease (AD). Previous studies found that BACE1-null mice had impaired performance on cognition and neurodegeneration during the aging process. Additionally, a synonymous polymorphism of BACE1 (rs638405) in exon 5 has been reported to be associated with risk for AD. We hypothesized that this BACE1 gene variant might influence regional brain volumes and cognitive tests in normal individuals.

Methods: Participants were 330 normal volunteers between 21 and 92 years of age (mean age 56.3 ± 22.0 years; 191 males, 139 females). Cognitive tests (the Mini-Mental State Examination and Digit Spans), magnetic resonance imaging, and genotyping of BACE1 rs638405 were examined for each subject. The differences in regional gray matter (GM) volumes between G homozygotes and C-allele carriers were tested using optimized voxel-based morphometry.

Results: Compared to C-allele carriers, G homozygotes exhibited significantly larger GM volumes in the left cerebellar culmen and right cerebellar lingual area, but no significant differences on cognitive function tests.

Conclusion: The findings suggest that the BACE1 rs638405 polymorphism may affect cerebellar morphology, but not cognitive function in healthy humans.

Keywords: Cerebellum; Cognition; Polymorphism; Volumetry; β-Site amyloid precursor protein-cleaving enzyme 1.

Figures

Fig. 1
Fig. 1
Regions showing significant GM volume reduction in C-carriers of BACE1 genotype compared with GG homozygotes. a Regions showing larger regional GM volume in GG homozygotes than C-carriers in the left cerebellar culmen and right cerebellar lingual area. b The glass brain map showing the spatial distribution of GM reduction in subjects with C allele of BACE1 (statistical criteria: uncorrected p < 0.001 with cluster size = 503 voxels). No area of regional GM volume reduction was found in GG homozygotes. Rt = Right; Lt = left.

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