@inproceedings{55a95e6b77424355a3e214137347f18e,
title = "Genetic clustering on the hippocampal surface for genome-wide association studies",
abstract = "Imaging genetics aims to discover how variants in the human genome influence brain measures derived from images. Genome-wide association scans (GWAS) can screen the genome for common differences in our DNA that relate to brain measures. In small samples, GWAS has low power as individual gene effects are weak and one must also correct for multiple comparisons across the genome and the image. Here we extend recent work on genetic clustering of images, to analyze surface-based models of anatomy using GWAS. We performed spherical harmonic analysis of hippocampal surfaces, automatically extracted from brain MRI scans of 1254 subjects. We clustered hippocampal surface regions with common genetic influences by examining genetic correlations (rg) between the normalized deformation values at all pairs of surface points. Using genetic correlations to cluster surface measures, we were able to boost effect sizes for genetic associations, compared to clustering with traditional phenotypic correlations using Pearson's r.",
keywords = "3D surfaces, GWAS, clustering, heritability, hippocampus, imaging genetics",
author = "Hibar, {Derrek P.} and Medland, {Sarah E.} and Stein, {Jason L.} and Sungeun Kim and Li Shen and Saykin, {Andrew J.} and {De Zubicaray}, {Greig I.} and McMahon, {Katie L.} and Montgomery, {Grant W.} and Martin, {Nicholas G.} and Wright, {Margaret J.} and Srdjan Djurovic and Agartz, {Ingrid A.} and Andreassen, {Ole A.} and Thompson, {Paul M.}",
year = "2013",
doi = "10.1007/978-3-642-40763-5_85",
language = "English",
isbn = "9783642407628",
series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",
number = "PART 2",
pages = "690--697",
booktitle = "Medical Image Computing and Computer-Assisted Intervention, MICCAI 2013 - 16th International Conference, Proceedings",
edition = "PART 2",
note = "16th International Conference on Medical Image Computing and Computer Assisted Intervention, MICCAI 2013 ; Conference date: 22-09-2013 Through 26-09-2013",
}