The evolution of mollusc shells

Wiley Interdisciplinary Reviews. Developmental Biology
Carmel McDougall, Bernard M Degnan

Abstract

Molluscan shells are externally fabricated by specialized epithelial cells on the dorsal mantle. Although a conserved set of regulatory genes appears to underlie specification of mantle progenitor cells, the genes that contribute to the formation of the mature shell are incredibly diverse. Recent comparative analyses of mantle transcriptomes and shell proteomes of gastropods and bivalves are consistent with shell diversity being underpinned by a rapidly evolving mantle secretome (suite of genes expressed in the mantle that encode secreted proteins) that is the product of (a) high rates of gene co-option into and loss from the mantle gene regulatory network, and (b) the rapid evolution of coding sequences, particular those encoding repetitive low complexity domains. Outside a few conserved genes, such as carbonic anhydrase, a so-called "biomineralization toolkit" has yet to be discovered. Despite this, a common suite of protein domains, which are often associated with the extracellular matrix and immunity, appear to have been independently and often uniquely co-opted into the mantle secretomes of different species. The evolvability of the mantle secretome provides a molecular explanation for the evolution and diversity of mollus...Continue Reading

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Citations

Sep 26, 2019·Proceedings of the National Academy of Sciences of the United States of America·Vanessa SchoepplerIgor Zlotnikov
Mar 15, 2019·Proceedings of the National Academy of Sciences of the United States of America·Adam B JohnsonJ David Lambert
May 25, 2020·Biological Reviews of the Cambridge Philosophical Society·Duncan J E Murdock
Dec 8, 2019·International Journal of Molecular Sciences·Mun Hwan ChoiDaewon Jeong
Dec 16, 2020·Genome Biology and Evolution·Rebecca M VarneyKevin M Kocot
Dec 18, 2020·Frontiers in Genetics·Jian Ming Khor, Charles A Ettensohn
Oct 15, 2020·Development·Kristen M Koenig, Jeffrey M Gross

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