Zinc enrichment and isotopic fractionation in a marine habitat of the c. 2.1 Ga Francevillian Group: A signature of zinc utilization by eukaryotes?
Zinc enrichment and isotopic fractionation in a marine habitat of the c. 2.1 Ga Francevillian Group: A signature of zinc utilization by eukaryotes?
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DOI：
10.1016/j.epsl.2023.118147
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发表时间：
2023-06
影响因子：
5.3
通讯作者：
Frantz Ossa Ossa-Frantz-Ossa-Ossa-115591413;M. Pons;A. Bekker;A. Hofmann;S. Poulton;Morten B. Andersen;A. Agangi;D. Gregory;C. Reinke;Bernd Steinhilber;J. Marin‐Carbonne;R. Schoenberg
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作者：
Frantz Ossa Ossa-Frantz-Ossa-Ossa-115591413;M. Pons;A. Bekker;A. Hofmann;S. Poulton;Morten B. Andersen;A. Agangi;D. Gregory;C. Reinke;Bernd Steinhilber;J. Marin‐Carbonne;R. Schoenberg
限制真核生物发生的时间和真核生物进化枝的分化是进化生物学中的一个主要挑战。在这里，我们提出了微量金属浓度和锌同位素数据的c。2.1 10亿年前的Francevillian集团黄铁矿化结构，以前被描述为第一个殖民地多细胞生物的假定残留物，以及它们的宿主黑色页岩。相对于寄主岩石，黄铁矿化构造强烈富集锌、钴和镍，至少一个数量级，锌同位素组成明显较轻。高浓度的含水锌，钴和镍的代谢需求结合较轻的锌同位素的优先吸收可能表明金属酶利用的真核生物在海洋栖息地c。2.1亿年前一旦得到证实，这将为真核发生提供一个关键的校准点，这表明这一重大的进化创新可能与大氧化事件后期大气氧含量升高同时发生，比目前广泛接受的时间早约4亿年。
Constraining the timing of eukaryogenesis and the divergence of eukaryotic clades is a major challenge in evolutionary biology. Here, we present trace metal concentration and zinc isotope data for c. 2.1 billion-year-old Francevillian Group pyritized structures, previously described as putative remnants of the first colonial multicellular organisms, and their host black shales. Relative to the host rocks, pyritized structures are strongly enriched in zinc, cobalt and nickel, by at least one order of magnitude, with markedly lighter zinc isotope compositions. A metabolic demand for high concentrations of aqueous zinc, cobalt, and nickel combined with preferential uptake of lighter zinc isotopes may indicate metalloenzyme utilization by eukaryotes in marine habitats c. 2.1 billion years ago. Once confirmed, this would provide a critical calibration point for eukaryogenesis, suggesting that this major evolutionary innovation may have happened contemporaneously with elevated atmospheric oxygen levels during the latter part of the Great Oxidation Event, some 400 million years earlier than is currently widely accepted.