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It is challenging to explore the relationship between these different types of genomic data sets. In this paper, we focus on a multivariate statistical method, canonical correlation analysis (CCA) method for this problem. Conventional CCA method does not work effectively if the number of data samples is significantly less than that of biomarkers, which is a typical case for genomic data (<jats:italic>e.g.<\/jats:italic>, SNPs). Sparse CCA (sCCA) methods were introduced to overcome such difficulty, mostly using penalizations with <jats:italic>l<\/jats:italic>-1 norm (CCA-<jats:italic>l<\/jats:italic>1) or the combination of <jats:italic>l<\/jats:italic>-1and <jats:italic>l<\/jats:italic>-2 norm (CCA-elastic net). However, they overlook the structural or group effect within genomic data in the analysis, which often exist and are important (<jats:italic>e.g.<\/jats:italic>, SNPs spanning a gene interact and work together as a group).<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>We propose a new group sparse CCA method (CCA-sparse group) along with an effective numerical algorithm to study the mutual relationship between two different types of genomic data (<jats:italic>i.e.<\/jats:italic>, SNP and gene expression). We then extend the model to a more general formulation that can include the existing sCCA models. We apply the model to feature\/variable selection from two data sets and compare our group sparse CCA method with existing sCCA methods on both simulation and two real datasets (human gliomas data and NCI60 data). We use a graphical representation of the samples with a pair of canonical variates to demonstrate the discriminating characteristic of the selected features. Pathway analysis is further performed for biological interpretation of those features.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>The CCA-sparse group method incorporates group effects of features into the correlation analysis while performs individual feature selection simultaneously. It outperforms the two sCCA methods (CCA-<jats:italic>l<\/jats:italic>1 and CCA-group) by identifying the correlated features with more true positives while controlling total discordance at a lower level on the simulated data, even if the group effect does not exist or there are irrelevant features grouped with true correlated features. Compared with our proposed CCA-group sparse models, CCA-<jats:italic>l<\/jats:italic>1 tends to select less true correlated features while CCA-group inclines to select more redundant features.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2105-14-245","type":"journal-article","created":{"date-parts":[[2013,8,12]],"date-time":"2013-08-12T00:14:36Z","timestamp":1376266476000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":103,"title":["Group sparse canonical correlation analysis for genomic data integration"],"prefix":"10.1186","volume":"14","author":[{"given":"Dongdong","family":"Lin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jigang","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingyao","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vince D","family":"Calhoun","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong-Wen","family":"Deng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu-Ping","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,8,12]]},"reference":[{"key":"6013_CR1","volume-title":"Proteomics Hum Genomics","author":"JS Hamid","year":"2009","unstructured":"Hamid JS, et al: Data integration in genetics and genomics: methods and challenges. 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