Synchrotron X-ray absorption spectroscopy of melanosomes in vertebrates and cephalopods: implications for the affinity of Tullimonstrum

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dc.contributor.authorRogers, Christopher S.
dc.contributor.authorAstrop, Timothy I.
dc.contributor.authorWebb, Samuel M.
dc.contributor.authorIto, Shosuke
dc.contributor.authorWakamatsu, Kazumasa
dc.contributor.authorMcNamara, Maria E.
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderHorizon 2020en
dc.contributor.funderU.S. Department of Energyen
dc.date.accessioned2021-09-09T15:43:24Z
dc.date.available2021-09-09T15:43:24Z
dc.date.issued2019-10-23
dc.date.updated2021-09-09T15:31:50Z
dc.description.abstractScreening pigments are essential for vision in animals. Vertebrates use melanins bound in melanosomes as screening pigments, whereas cephalopods are assumed to use ommochromes. Preserved eye melanosomes in the controversial fossil Tullimonstrum (Mazon Creek, IL, USA) are partitioned by size and/or shape into distinct layers. These layers resemble tissue-specific melanosome populations considered unique to the vertebrate eye. Here, we show that extant cephalopod eyes also show tissue-specific size- and/or shape-specific partitioning of melanosomes; these differ from vertebrate melanosomes in the relative abundance of trace metals and in the binding environment of copper. Chemical signatures of melanosomes in the eyes of Tullimonstrum more closely resemble those of modern cephalopods than those of vertebrates, suggesting that an invertebrate affinity for Tullimonstrum is plausible. Melanosome chemistry may thus provide insights into the phylogenetic affinities of enigmatic fossils where melanosome size and/or shape are equivocal.en
dc.description.sponsorshipUS Department of Energy (Office of Science, Office of Basic Energy Sciences under contract no. DE-AC02-76SF00515)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid20191649en
dc.identifier.citationRogers, C. S., Astrop, T. I., Webb, S. M., Ito, S., Wakamatsu, K. and McNamara, M. E. (2019) 'Synchrotron X-ray absorption spectroscopy of melanosomes in vertebrates and cephalopods: implications for the affinity of Tullimonstrum', Proceedings of the Royal Society B: Biological Sciences, 286(1913), 20191649 (8 pp). doi: 10.1098/rspb.2019.1649en
dc.identifier.doi10.1098/rspb.2019.1649en
dc.identifier.eissn1471-2954
dc.identifier.endpage8en
dc.identifier.issn0962-8452
dc.identifier.issued1913en
dc.identifier.journaltitleProceedings of The Royal Society Ben
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/11863
dc.identifier.volume286en
dc.language.isoenen
dc.publisherThe Royal Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::ERC::ERC-STG/637691/EU/Animal coloration through deep time: evolutionary novelty, homology and taphonomy/ANICOLEVOen
dc.relation.urihttps://royalsocietypublishing.org/doi/10.1098/rspb.2019.1649
dc.rights© 2019 The Author(s). Published by the Royal Society.en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectFossil soft tissuesen
dc.subjectKonservat-Lagerstattenen
dc.subjectMelanosomesen
dc.subjectTrace metalsen
dc.titleSynchrotron X-ray absorption spectroscopy of melanosomes in vertebrates and cephalopods: implications for the affinity of Tullimonstrumen
dc.typeArticle (peer-reviewed)en
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