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Published on: July 30, 2011
Molecular network of Abdominal-A in Scylla paramamosain revealed through RNA interference and transcriptomic analysis
Yin Zhang1, Yali Chen1, Shihao Shi1
1Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, 515063, China; International Joint Research Center for the Development and Utilization of Important Mariculture Varieties Surrounding the South China Sea Region, Shantou University, Shantou, 515063, China; STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, 515063, China.
Abstract:
The larval development of crustaceans involves profound appendage transformations, and elucidating the underlying molecular regulatory mechanisms is crucial for understanding the fundamental principles of body plan formation. The Hox gene Abdominal-A (Abd-A) plays a key role in arthropod appendage patterning and formation. This study employed RNA interference (RNAi) coupled with high-throughput transcriptomics to define the regulatory role of SpAbd-A in pleopod morphogenesis during mud crab (Scylla paramamosain) larval development. Transcriptome sequencing was conducted on individuals displaying developmental abnormalities, such as pleopod degeneration or complete loss, after SpAbd-A RNAi treatment during the zoea IV stage of S. paramamosain. 333 differentially expressed genes (99 upregulated, 234 downregulated) were identified. Key pathways and processes were affected including: chitin metabolism (chitin deacetylase 8, resilin, β-N-acetylhexosaminidase, peritrophin-1, endochitinase-like, adult cuticle protein ACP-20); juvenile hormone (JH) signaling (juvenile hormone epoxide hydrolase 1, juvenile hormone esterase); appendage patterning and development (engrailed-2a, empty spiracles, aristaless, distal-less, Abdominal-B, BarH-like 1 homeobox protein, LIM homeobox 1); and specific pathways (organic anion transporting polypeptide 74D, ubiquitin-specific protease 8). Functional enrichment analysis confirmed profound disruptions in chitin catabolic processes, lipid transporter activity, and hormone biosynthetic pathways. This study provides the comprehensive molecular characterization establishing Abd-A as a critical regulator of crustacean appendage morphogenesis. The identified Hox-centered regulatory network present novel targets for enhancing larval quality in commercial mud crab aquaculture through biomacromolecule-based developmental engineering strategies.
