Hidden chromosome structures reveal greater complexity in how roundworms organize DNA
Almost every cell in our body contains around two meters (6.6 feet) of DNA, packed into a tiny nucleus. Yet for the cell to function, this enormous amount of genetic material must remain organized and accessible. Researchers at the University of Basel have now discovered three distinct types of large chromosomal domains that help organize DNA in nuclei.
Researchers have uncovered three distinct types of large chromosomal domains within the nucleus of roundworms that help organize DNA. Despite the enormous length of DNA that must fit into a cell's nucleus—comparable to stretching a fishing line across Switzerland—the genetic material remains organized and accessible. Previously, it was believed that certain roundworms lacked large, clearly defined DNA organization structures, but recent research has debunked this notion.
By examining individual DNA molecules using a technique called chromatin tracing, researchers discovered these hidden structures, challenging previous assumptions. One domain resembles the well-known TADs found in vertebrates, while another houses genes crucial for ribosome production, distinct from the nucleolus and with different formation mechanisms.
The discovery of these diverse domain types highlights the fundamental principles of chromosome organization across the animal kingdom and raises questions about their functions and implications for gene regulation.
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