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Knowing a gene expression signature in heart disease can lead to the development of more efficient diagnosis and treatments that may prevent premature deaths. A large amount of microarray data is available in public repositories and can be used to identify differentially expressed genes. However, most of the microarray datasets are composed of a reduced number of samples and to obtain more reliable results, several datasets have to be merged, which is a challenging task. The identification of differentially expressed genes is commonly done using statistical methods. Nonetheless, these methods are based on the definition of an arbitrary threshold to select the differentially expressed genes and there is no consensus on the values that should be used.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Nine publicly available microarray datasets from studies of different heart diseases were merged to form a dataset composed of 689 samples and 8354 features. Subsequently, the adjusted<jats:italic>p<\/jats:italic>-value and fold change were determined and by combining a set of adjusted<jats:italic>p<\/jats:italic>-values cutoffs with a list of different fold change thresholds, 12 sets of differentially expressed genes were obtained. To select the set of differentially expressed genes that has the best accuracy in classifying samples from patients with heart diseases and samples from patients with no heart condition, the random forest algorithm was used. A set of 62 differentially expressed genes having a classification accuracy of approximately 95% was identified.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We identified a gene expression signature common to different cardiac diseases and supported our findings by showing their involvement in the pathophysiology of the heart. The approach used in this study is suitable for the identification of gene expression signatures, and can be extended to different diseases.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s13040-020-00217-8","type":"journal-article","created":{"date-parts":[[2020,7,8]],"date-time":"2020-07-08T12:03:48Z","timestamp":1594209828000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Merging microarray studies to identify a common gene expression signature to several structural heart diseases"],"prefix":"10.1186","volume":"13","author":[{"given":"Olga","family":"Fajarda","sequence":"first","affiliation":[]},{"given":"Sara","family":"Duarte-Pereira","sequence":"additional","affiliation":[]},{"given":"Raquel M.","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9 Lu\u00eds","family":"Oliveira","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,7,8]]},"reference":[{"issue":"1","key":"217_CR1","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1093\/bmb\/ldp028","volume":"92","author":"CD Mathers","year":"2009","unstructured":"Mathers CD, Boerma T, Ma Fat D. 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