Aragonite shells are more ancient than calcite ones in bivalves: new evidence based on omics
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Two calcium carbonate crystal polymorphs, aragonite and calcite, are the main inorganic components of mollusk shells. Some fossil evidences suggest that aragonite shell is more ancient than calcite shell for the Bivalvia. But, the molecular biology evidence for the above deduction is absent. In this study, we searched for homologs of bivalve aragonite-related and calcite-related shell proteins in the oyster genome, and found that no homologs of calcite-related shell protein but some homologs of aragonite-related shell proteins in the oyster genome. We explained the results as the new evidence to support that aragonite shells are more ancient than calcite shells in bivalves combined the published biogeological and seawater chemistry data.
KeywordsCrassostrea gigas Aragonite shell Calcite shell Aragonite sea Calcite sea Biomineralization
This research was supported by the National Basic Research Program of China (973 Program) (no. 2010CB126401), the National Natural Science Foundation of China (no. 40730845 and 31302181), the earmarked fund for Modern Agro-industry Technology Research System, Taishan Scholar Program of Shandon and Taishan Scholars Climb Program of Shandong.
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