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Feed efficiency is an economically important trait in genetic improvement programs of  L. vannamei . Residual feed intake (RFI), an ideal measure of feed efficiency, is the difference between observed feed intake and expected feed requirement predicted from maintenance and production. Exploring the molecular basis of RFI is essential to facilitate the genetic breeding of feed efficiency in  L. vannamei . However, few studies have been reported in this aspect. In this study, we sequenced muscle transcriptomes of a high-efficiency group, a low-efficiency group and a control group originating from two families, and compared the gene expression patterns between each extreme group and the control group. A total of 383 differentially expressed genes were identified, most of which were involved in cell proliferation, growth and signaling, glucose homeostasis, energy and nutrients metabolism. Functional enrichment analysis of these genes revealed 13 significantly enriched biological pathways, including signaling pathways such as PI3K-Akt signaling pathway, AMPK signaling pathway and mTOR signaling pathway, as well as some important pathways such as ubiquitin mediated proteolysis, cell cycle, pentose phosphate pathway and glycolysis/gluconeogenesis. These genes and pathways provide initial insight into the molecular mechanisms driving the feed efficiency in  L. vannamei .

Comparative transcriptome analysis of the Pacific White Shrimp (Litopenaeus vannamei) muscle reveals the molecular basis of residual feed intake