title: Comparative transcriptomic analysis provides insights into the molecular basis of the metamorphosis and nutrition metabolism change from zoeae to megalopae in Eriocheir sinensis.
abstract: Within the larval period of Eriocheir sinensis, there is pronounced morphological changes upon the molt from the fifth zoeae (Z5) to megalopae (M), and low survival rate exists during this transition, which is typical in crab species. RNA sequencing was applied to Z5 and M of E. sinensis, resulting in the discovery of 19,186 unigenes and 652 differentially expressed genes (DEGs, 3.40% of the unigenes). The important metabolic pathways that might play roles in the larval development of E. sinensis from Z5 to M were detected to be 'Xenobiotics Biodegradation and Metabolism (8.16%)', 'Metabolism of Cofactors and Vitamins (6.70%)', 'Lipid Metabolism (6.36%)', and 'Amino Acid Metabolism (6.28%)'. Further, 19 DEGs possibly contributing to the morphological and sensory capability changes of the larvae were identified, like multiple copies of cuticle protein genes, retinaldehyde-binding protein 1 (RLBP1), envelope protein (Envelope) and hormone-related gene ecdysteroid-regulated 16kDa protein (ESR16). Moreover, 62 DEGs were identified to be related to carbohydrate, lipid and protein digestion and metabolism, such as glucose dehydrogenases (GDHs), lipases (LIPs) and serine proteases (SPs). Among these DEGs, more genes related to the substance metabolism were found up-regulated in Z5 than M, suggesting that more energy might be essential to be released for Z5 to complete the transition into M. Characterization of the crucial DEGs by real-time quantitative PCR re-conformed their expression pattern. This study provides the first genome-wide transcriptomic analysis of E. sinensis Z5 and M for studying the molecular basis of the larvae metamorphosis and nutrition metabolism.
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China.
authors.forename: Yingdong
authors.initials: Y
authors.lastname: Li
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China.
authors.forename: Min
authors.initials: M
authors.lastname: Hui
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; National and Local Joint Engineering Laboratory Of Ecological Mariculture, Qingdao, 266071, China. Electronic address: zhxcui@qdio.ac.cn.
authors.forename: Zhaoxia
authors.initials: Z
authors.lastname: Cui
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Chengwen
authors.initials: C
authors.lastname: Song
authors.affiliation: EMBL, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Shi
mesh_terms: D000818:Animals; D050260:Carbohydrate Metabolism; D003445:Crustacea / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D007814:Larva / Q000254:growth & development / Q000378:metabolism*; D050356:Lipid Metabolism; D008675:Metamorphosis, Biological; D011506:Proteins / Q000378:metabolism; D059467:Transcriptome
chemical_list: D011506:Proteins
keywords: Larval development; Metamorphosis; Mitten crab; Nutrition metabolism; Transcriptomics