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They generate bicarbonate from metabolic carbon dioxide and through calcium carbonate crystal formation play a key role in the regulation of mineralized structures. To better understand how \u03b1-CAs contribute to shell mineralization in the marine Mediterranean mussel (<jats:italic>Mytilus galloprovincialis<\/jats:italic>) we characterized them in the mantle. Phylogenetic analysis revealed that mollusc \u03b1-CA evolution was affected by lineage and species-specific events. Ten \u03b1-CAs were found in the Mediterranean mussel mantle and the most abundant form was named, MgNACR, as it grouped with oyster nacreins (NACR). Exposure of the Mediterranean mussel to reduced water salinity (18 vs 37 ppt), caused a significant reduction (p\u2009&lt;\u20090.05) in mantle esterase activity and MgNACR transcript abundance (p\u2009&lt;\u20090.05). Protonograms revealed multiple proteins in the mantle with \u03b1\u2013CA hydratase activity and mapped to a protein with a similar size to that deduced for monomeric MgNACR. Our data indicate that MgNACR is a major \u03b1\u2013CA enzyme in mantle and that by homology with oyster nacreins likely regulates mussel shell production. We propose that species-dependent \u03b1-CA evolution may contribute to explain the diversity of bivalve shell structures and their vulnerability to environmental changes.<\/jats:p>","DOI":"10.1038\/s41598-019-46913-2","type":"journal-article","created":{"date-parts":[[2019,7,18]],"date-time":"2019-07-18T10:02:38Z","timestamp":1563444158000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Evolution and diversity of alpha-carbonic anhydrases in the mantle of the Mediterranean mussel (Mytilus galloprovincialis)"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7890-0170","authenticated-orcid":false,"given":"Jo\u00e3o C. 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