Expansion and loss events characterized the occurrence of MIF-like genes in bivalves


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umberto.rosani [ at ] awi.de

Abstract

Macrophage migration inhibitory factor (MIF) dynamically connects innate and adaptive immune systems in vertebrate animals, allowing highly orchestrated systemic responses to various insults. The occurrence of MIF-like genes in non-vertebrate organisms suggests its origin from an ancestral metazoan gene, whose function is still a matter of debate. In the present work, by analyzing available genomic and transcriptomic data from bivalve mollusks, we identified 137 MIF-like sequences, which were classified into three types, based on phylogeny and conservation of key residues: MIF, D-DT, and the lineage-specific type MDL. Comparative genomics revealed syntenic conservation of homologous genes at the family level, the loss of D-DT in the Ostreidae family as well as the expansion of MIF-like genes in the Mytilidae family, possibly underpinning the neofunctionalization of duplicated gene copies. In M. galloprovincialis, MIF and one D-DT were mostly expressed in haemocytes and mantle rim of untreated animals, while D-DT paralogs often showed very limited expression, suggesting an accessory role or their persistence as relict genes.



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Eprint ID
49888
DOI 10.1016/j.fsi.2019.07.019

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Rosani, U. , Domeneghetti, S. , Gerdol, M. , Pallavicini, A. and Venier, P. (2019): Expansion and loss events characterized the occurrence of MIF-like genes in bivalves , Fish & Shellfish Immunology, 93 , pp. 39-49 . doi: 10.1016/j.fsi.2019.07.019


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eu-repo/grantAgreement/EC/H2020/678589


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