FishExp: A comprehensive database and analysis platform for gene expression and alternative splicing of fish species.

The publicly archived RNA-seq data has grown exponentially, while its valuable information has not yet been fully discovered and utilized, such as alternative splicing and its integration with gene expression. This is especially true for fish species which play important roles in ecology, research and the food industry. Furthermore, there is a lack of online platform to analyze users' new data individually and jointly with existing data for the comprehensive analysis of alternative splicing and gene expression. Here, we present FishExp, a web-based data platform covering gene expression and alternative splicing in 26,081 RNA-seq experiments from 44 fishes. It allows users to query the data in a variety of ways, including gene identifier/symbol, functional term, and BLAST alignment. Moreover, users can customize experiments and tools to perform differential/specific expression and alternative splicing analysis, co-expression and cross-species analysis. In addition, functional enrichment is provided to confer biological significance. Notably, users are allowed to submit their own data and perform various analyses using the new data alone or alongside existing data in FishExp. Results of retrieval and analysis can be visualized on the gene-, transcript- and splicing event-level webpage in a highly interactive and intuitive manner. All data in FishExp can be downloaded for more in-depth analysis. The manually curated sample information, uniform data processing and various tools make it efficient for users to gain new insights from these large data sets, facilitating scientific hypothesis generation. FishExp is freely accessible at https://bioinfo.njau.edu.cn/fishExp.