Abstract
Gene expression profiling by cDNA microarrays during murine thymus ontogeny has contributed to dissecting the large-scale molecular genetics of T cell maturation. Gene profiling, although useful for characterizing the thymus developmental phases and identifying the differentially expressed genes, does not permit the determination of possible interactions between genes. In order to reconstruct genetic interactions, on RNA level, within thymocyte differentiation, a pair of microarrays containing a total of 1,576 cDNA sequences derived from the IMAGE MTB library was applied on samples of developing thymuses (14–17 days of gestation). The data were analyzed using the GeneNetwork program. Genes that were previously identified as differentially expressed during thymus ontogeny showed their relationships with several other genes. The present method provided the detection of gene nodes coding for proteins implicated in the calcium signaling pathway, such as Prrg2 and Stxbp3, and in protein transport toward the cell membrane, such as Gosr2. The results demonstrate the feasibility of reconstructing networks based on cDNA microarray gene expression determinations, contributing to a clearer understanding of the complex interactions between genes involved in thymus/thymocyte development.
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Acknowledgments
This study was funded by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). The cDNA clones used for preparing the microarrays were kindly ceded by Dr. Catherine Nguyen (INSERM, URM 206, Marseille, France). We thank Guilherme Liberato Silva for help with the GeneNetwork program and discussions.
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Cláudia Macedo and Danielle A. Magalhães contributed equally to this study.
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Macedo, C., Magalhães, D.A., Tonani, M. et al. Genes that code for T cell signaling proteins establish transcriptional regulatory networks during thymus ontogeny. Mol Cell Biochem 318, 63–71 (2008). https://doi.org/10.1007/s11010-008-9857-7
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DOI: https://doi.org/10.1007/s11010-008-9857-7