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Nucleus preservation in early Ediacaran Weng'an embryo-like fossils, experimental taphonomy of nuclei and implications for reading the eukaryote fossil record
Sun, Weichen (孙伟辰)1,3; Yin, Zongjun (殷宗军)1,2; Cunningham, John A.4; Liu, Pengju5; Zhu, Maoyan (朱茂炎)1,2,6; Donoghue, Philip C. J.4
2020-08-06
Source PublicationINTERFACE FOCUS
ISSN2042-8898
Volume10Issue:4Pages:10
Abstract

The challenge of identifying fossilized organelles has long hampered attempts to interpret the fossil record of early eukaryote evolution. We explore this challenge through experimental taphonomy of nuclei in a living eukaryote and microscale physical and chemical characterization of putative nuclei in embryo-like fossils from the early Ediacaran Weng'an Biota. The fossil nuclei exhibit diverse preservational modes that differ in shape, presence or absence of an inner body and the chemistry of the associated mineralization. The nuclei are not directly fossilized; rather, they manifest as external moulds. Experimental taphonomy of epidermal cells from the common onion (Allium cepa) demonstrates that nuclei are more decay resistant than their host cells, generally maintaining their physical dimensions for weeks to months post-mortem, though under some experimental conditions they exhibit shrinkage and/or become shrouded in microbial biofilms. The fossil and experimental evidence may be rationalized in a single taphonomic pathway of selective mineralization of the cell cytoplasm, preserving an external mould of the nucleus that is itself resistant to both decay and mineral replication. Combined, our results provide both a secure identification of the Weng'an nuclei as well as the potential of a fossil record of organelles that might help arbitrate in long-standing debates over the relative and absolute timing of the evolutionary assembly of eukaryote-grade cells.

KeywordEdiacaran Weng'an Biota fossil embryo subcellular structure taphonomy
DOI10.1098/rsfs.2020.0015
Indexed BySCI
Language英语
WOS KeywordEXPERIMENTAL SILICIFICATION ; DOUSHANTUO FORMATION ; ORIGIN ; TISSUE ; FOSSILIZATION ; ORGANISMS ; BIOTA ; LEAF ; ULTRASTRUCTURE ; MICROORGANISMS
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS)[XDB26000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS)[18000000] ; National Natural Science Foundation of China[41672013] ; National Natural Science Foundation of China[41661134048] ; National Natural Science Foundation of China[41921002] ; Youth Innovation Promotion Association of the CAS[2017360] ; Natural Environment Research Council under BETR programme[NE/J018325/1] ; Natural Environment Research Council under BETR programme[NE/P013678/1] ; Natural Environment Research Council[NE/J018325/1] ; Natural Environment Research Council[NE/P013678/1]
WOS Research AreaLife Sciences & Biomedicine - Other Topics
WOS SubjectBiology
WOS IDWOS:000542128100008
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the CAS ; Natural Environment Research Council under BETR programme ; Natural Environment Research Council
PublisherROYAL SOC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32089
Collection中国科学院南京地质古生物研究所
Corresponding AuthorYin, Zongjun (殷宗军); Donoghue, Philip C. J.
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
3.Univ Sci & Technol China, Hefei 230026, Peoples R China
4.Univ Bristol, Sch Earth Sci, Life Sci Bldg,Tyndall Ave, Bristol BS8 1TQ, Avon, England
5.Chinese Acad Geol Sci, Inst Geol, Beijing 100043, Peoples R China
6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Sun, Weichen ,Yin, Zongjun ,Cunningham, John A.,et al. Nucleus preservation in early Ediacaran Weng'an embryo-like fossils, experimental taphonomy of nuclei and implications for reading the eukaryote fossil record[J]. INTERFACE FOCUS,2020,10(4):10.
APA Sun, Weichen ,Yin, Zongjun ,Cunningham, John A.,Liu, Pengju,Zhu, Maoyan ,&Donoghue, Philip C. J..(2020).Nucleus preservation in early Ediacaran Weng'an embryo-like fossils, experimental taphonomy of nuclei and implications for reading the eukaryote fossil record.INTERFACE FOCUS,10(4),10.
MLA Sun, Weichen ,et al."Nucleus preservation in early Ediacaran Weng'an embryo-like fossils, experimental taphonomy of nuclei and implications for reading the eukaryote fossil record".INTERFACE FOCUS 10.4(2020):10.
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