Science and Nature

Unraveling a mystery of dinoflagellate genomic architecture

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Unique work from a Stanford University-led crew of researchers including Carnegie’s Arthur Grossman and Tingting Xiang unravels a longstanding mystery in regards to the relationship between form and performance within the genetic enviornment topic of a diverse team of algae known as dinoflagellates.

Their findings, printed in Nature Genetics, take into accout implications for figuring out genomic organizational principles of all organisms.

Dinoflagellates embody extra than 2,000 species of marine and freshwater plankton, somewhat quite so much of that are photosynthetic, and a few of which also ingest assorted organisms for food. They play a broad series of roles in diverse ecosystems, including inaccurate environments, and are predominantly known to humans because the trigger of toxic “red tides” and because the provision of most ocean bioluminescence.

Some photosynthetic dinoflagellates are also needed to the health of coral reefs. These algae are taken up by particular particular person coral cells and form mutually purposeful relationships whereby vitamins are exchanged. Ocean warming and pollution can trigger this relationship between the alga and animal to interrupt down, ensuing in ghostly white “bleached” corals that are at likelihood of starvation, which can also lead to the demise of reef ecosystems.

“Love animals and flowers, dinoflagellates are complex eukaryotic organisms and are evolutionarily attention-grabbing as a outcome of their genetic enviornment topic is packaged in a approach that is odd among organisms with complex cell architecture,” mentioned lead author Georgi Marinov of Stanford University.

One defining characteristic of eukaryotes is that their DNA is housed inner a nucleus within each and each cell and is organized as separate items known as chromosomes. Furthermore, in most eukaryotes, segments of DNA are atomize spherical a spool-indulge in complex of proteins known as a nucleosome. This organization is belief to predate the final ancestor of all eukaryotes. It helps to condense the genetic enviornment topic into a minute space and control salvage entry to to the DNA and how the genes encoded in it are activated to divulge the cell’s physiological gains.

“By distinction, even supposing dinoflagellates are eukaryotes, their genome just isn’t any longer packaged as nucleosomes, but somewhat appears to be like to be permanently condensed and exist in a liquid crystal snort,” Grossman explained. “We amassed take into accout so mighty to search out out about how genome architecture influences genome plot in all eukaryotes; so, dinoflagellate‘s distinctive ‘tight’ packaging of DNA can also abet us perceive the similarities and differences in organizational principles among eukaryote genomes.”

To delve into this search recordsdata from, the research crew—which also included Stanford’s Alexandro E. Trevino, Anshul Kundaje, and William J. Greenleaf—veteran sophisticated technology to procedure the 3D spatial relationships of the genetic enviornment topic of the dinoflagellate Breviolum minutum.

“Our work printed topological sides within the Breviolum genome that change from the a form of fashions of dinoflagellate genome organization which had been predicted for the rationale that 1960s,” mentioned Xiang.

They chanced on proof of elephantine self-interacting areas of DNA within the dinoflagellate genome known as “topologically associating domains.” The work means that this genomic architecture is attributable to the route of whereby genes are transcribed into RNA; this RNA is therefore translated into proteins that salvage the cell’s diverse actions.

If fact be told, when transcription used to be inhibited, the architecture ‘loosened up,” indicating that the rigidly preserved topographical sides are, certainly, a plot of gene task.

“There are many extra questions raised by these outcomes, which signify a huge step forward in unraveling the mysteries of the dinoflagellate genome. They’re also offering a new standpoint on structure-plot relationships inherent to chromosomes,” Grossman concluded.

More records:
Georgi Ok. Marinov et al, Transcription-dependent domain-scale three-dimensional genome organization within the dinoflagellate Breviolum minutum, Nature Genetics (2021). DOI: 10.1038/s41588-021-00848-5

Unraveling a mystery of dinoflagellate genomic architecture (2021, Would possibly per chance well presumably 3)
retrieved 4 Would possibly per chance well presumably 2021

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