Peripheral T-cell lymphomas represent an unmet medical need. The paucity of biological studies impedes the development of new treatment strategies. In this doctoral thesis, I leveraged next-generation sequencing technologies to identify new gene fusions in peripheral T-cell lymphomas. These insights were used to engineer cell systems and mouse models, which closely resemble human peripheral T-cell lymphomas. These models are valuable tools to understand the biology of peripheral T-cell lymphomas and provide a rational for new treatment regimens.