摘要
Bivalves are species-rich mollusks with prominent protective roles in coastal ecosystems.Across these ancient lineages,colony-founding larvae anchor themselves either by byssus production or by cemented attachment.The latter mode of sessile life is strongly molded by left-right shell asymmetry during larval development of Ostreoida oysters such as Crassostrea hongkongensis.Here,we sequenced the genome of C.hongkongensis in high resolution and compared it to reference bivalve genomes to unveil genomic determinants driving cemented attachment and shell asymmetry.Importantly,loss of the homeobox gene Antennapedia(Antp)and broad expansion of lineagespecific extracellular gene families are implicated in a shift from byssal to cemented attachment in bivalves.Comparative transcriptomic analysis shows a conspicuous divergence between leftright asymmetrical C.hongkongensis and symmetrical Pinctada fucata in their expression profiles.Especially,a couple of orthologous transcription factor genes and lineage-specific shell-related gene families including that encoding tyrosinases are elevated,and may cooperatively govern asymmetrical shell formation in Ostreoida oysters.
基金
support from the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),China(Grant No. GML2019ZD0407)
the Key Deployment Project of Centre for Ocean Mega-Research of Science, Chinese Academy of Science (Grant No. COMS2019Q11)
the National Natural Science Foundation of China (Grant Nos. 32073002 and 31902404)
the China Agricultural Research System (Grant No. CARS-49)
the Science and Technology Program of Guangzhou, China (Grant No. 201804020073)
Natural Science Foundation of Guangdong, China (Grant No. 2020A1515011533)
the Program of the Pearl River Young Talents of Science and Technology in Guangzhou of China (Grant No. 201806010003)
the Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences (Grant Nos. ISEE2018PY01, ISEE2018PY03, and ISEE2018ZD01)
the Science and Technology Planning Project of Guangdong Province, China (Grant Nos. 2017B030314052 and 201707010177)
