Eukaryotes are usually divided into four boundaries: plants, animals, fungi, and tiny multicellular organisms called protozoa, covering almost all eukaryotes found on Earth. But researchers at Dalhousie University in Nova Scotia, Canada, recently posted on the British website that they found a new branch of the tree of life, a previously unknown new eukaryote, perhaps The "gate" where it is located is upgraded to a new "boundary".
The paper describes two organisms, one newly discovered in Nova Scotia and the other one discovered in 1988. After DNA analysis, they were found to be more different from other eukaryotes than previously thought.
The researchers called the newly discovered creature Hemimastix Kukwesjijk, named after a greedy hairy ogre in the local Mikmak mythology. From the appearance, the new creature has an elliptical body surrounded by rows of linear flagella. Observed by scanning electron microscopy 3D, this creature is somewhat similar to a hairy pumpkin seed.
One of the research directors, Yanna Eglite, said: "They look a bit clumsy, like ciliates, but the way they swim is less coordinated."
It is reported that Eglit found a sample of new creatures while hiking on a path in Nova Scotia and collected some soil. A few weeks later, after hydrating the soil and observing it under the microscope, she realized that the movement of the new creatures was rare, so she conducted an in-depth study.
The team used single-cell transcriptomics to study individual cells in new organisms and observed the activity of messenger RNA molecules that transmit information between hundreds of genes. Through genetic sequencing, the difference between new organisms and other eukaryotes is revealed.
Alastair Simpson, the lead author of the study and a professor of biology at Dalhousie University, said: "It is a branch of the tree of life that may have been separated for more than a billion years. We don't have any information about it. It opened up a A new door to help people understand the evolution of complex cells and their ancient origins." (Liu Xia)
Source: Technology Daily
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