期刊论文详细信息
Frontiers in Neuroscience
Discovery and replication of gene influences on brain structure using LASSO regression
Michael W Weiner1  Clifford R Jack Jr2  Narelle K Hansell3  Nicholas G Martin3  Margaret J Wright3  Jason L Stein4  Priya eRajagopalan4  Neda eJahanshad4  Paul M Thompson4  Xue eHua4  Derrek P Hibar4  Omid eKohannim4  Art eToga4  Katie L McMahon6  Greig I de Zubicaray6 
[1] Department of Veterans Affairs;Mayo Clinic;Queensland Institute of Medical Research;UCLA;UCSF;University of Queensland;
关键词: Neuroimaging;    GWAS;    MRI;    imaging genetics;    LASSO;    MACROD2;   
DOI  :  10.3389/fnins.2012.00115
来源: DOAJ
【 摘 要 】

We implemented LASSO (least absolute shrinkage and selection operator) regression to evaluate gene effects in genome-wide association studies (GWAS) of brain images, using an MRI-derived temporal lobe volume measure from 729 subjects scanned as part of the Alzheimer’s Disease Neuroimaging Initiative (ADNI). Sparse groups of SNPs in individual genes were selected by LASSO, which identifies efficient sets of variants influencing the data. These SNPs were considered jointly when assessing their association with neuroimaging measures. We discovered 22 genes that passed genome-wide significance for influencing temporal lobe volume. This was a substantially greater number of significant genes compared to those found with standard, univariate GWAS. These top genes are all expressed in the brain and include genes previously related to brain function or neuropsychiatric disorders such as MACROD2, SORCS2, GRIN2B, MAGI2, NPAS3, CLSTN2, GABRG3, NRXN3, PRKAG2, GAS7, RBFOX1, ADARB2, CHD4 and CDH13. The top genes we identified with this method also displayed significant and widespread post-hoc effects on voxelwise, tensor-based morphometry (TBM) maps of the temporal lobes. The most significantly associated gene was an autism susceptibility gene known as MACROD2. We were able to successfully replicate the effect of the MACROD2 gene in an independent cohort of 564 young, Australian healthy adult twins and siblings scanned with MRI (mean age: 23.8±2.2 SD years). In exploratory analyses, three selected SNPs in the MACROD2 gene were also significantly associated with performance intelligence quotient (PIQ). Our approach powerfully complements univariate techniques in detecting influences of genes on the living brain.

【 授权许可】

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