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PMID: 22888310 Published · epublish English Journal Article

Discovery and Replication of Gene Influences on Brain Structure Using LASSO Regression.

Frontiers in neuroscience ·Vol. 6 ·2012-00-00 ·Pages 115

Kohannim O, Hibar DP, Stein JL, Jahanshad N, Hua X, Rajagopalan P, Toga AW, Jack CR, Weiner MW, de Zubicaray GI, McMahon KL, Hansell NK, Martin NG, Wright MJ, Thompson PM, Alzheimer’s Disease Neuroimaging Initiative

Abstract

We implemented least absolute shrinkage and selection operator (LASSO) 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). Our approach powerfully complements univariate techniques in detecting influences of genes on the living brain.

Keywords
GWAS LASSO MACROD2 MRI imaging genetics neuroimaging
Authors & Affiliations
16 authors, click to expand affiliations / ORCID
Kohannim Omid
Imaging Genetics Center at the Laboratory of Neuro Imaging, Department of Neurology, UCLA School of Medicine Los Angeles, CA, USA.
Hibar Derrek P
Stein Jason L
Jahanshad Neda
Hua Xue
Rajagopalan Priya
Toga Arthur W
Jack Clifford R
Weiner Michael W
de Zubicaray Greig I
McMahon Katie L
Hansell Narelle K
Martin Nicholas G
Wright Margaret J
Thompson Paul M
Alzheimer’s Disease Neuroimaging Initiative
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Article Info
Journal
Frontiers in neuroscience
Abbr.
Front Neurosci
ISSN
1662-453X
Published
2012-00-00
Epub
2012-00-06
Pages
115
Language
English
Region
Switzerland
NLM ID
101478481
PMCID
PMC3412288
Grants
NIA NIH HHS · R01 AG040060 · United States
NCRR NIH HHS · R21 RR019771 · United States
NIA NIH HHS · P50 AG016570 · United States
NICHD NIH HHS · R01 HD050735 · United States
NIA NIH HHS · K01 AG030514 · United States
NIBIB NIH HHS · R21 EB001561 · United States
NIA NIH HHS · F30 AG041681 · United States
NIGMS NIH HHS · T32 GM008042 · United States
NIA NIH HHS · U24 AG021886 · United States
NIA NIH HHS · U01 AG024904 · United States
NIA NIH HHS · U19 AG010483 · United States
NIMH NIH HHS · R01 MH097268 · United States
NIA NIH HHS · P30 AG010129 · United States
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