Study Reveals Key Protein in Endosymbiont Division of Single-Celled Louse
A groundbreaking study, published in Science Advances on March 19, 2025, sheds light on the intricate relationship between a single-celled louse species and its endosymbiont. The research, assigned DOI 10.1126/sciadv.adp8518, explores the control of endosymbiont division in Angomonas deanei, a trypanosomatid from the subfamily Strigomonadinae.
The endosymbiont in A. deanei is an intermediate stage between a bacterial endosymbiont and a host-controlled organelle. This unique relationship has been a focus of an unnamed researcher, whose work was published in the prestigious journal. The endosymbionts of Strigomonadinae, including A. deanei, have lost most genes for division, retaining only a few like FtsZ. All members of this subfamily possess an endosymbiont, which provides metabolic products and co-factors to their host cells.
Meanwhile, at Heinrich-Heine-Universität Düsseldorf, Prof. Dr. Eva Nowack and her team are investigating the assimilation process of endosymbionts. Their work has revealed that a host protein, ETP9, plays a crucial role in the division of the endosymbiont in A. deanei. This protein, controlled from the cell nucleus and dependent on the cell cycle, is essential for the endosymbiont's division.
The study published in Science Advances offers valuable insights into the evolution of endosymbiosis and the complex interplay between host cells and their endosymbionts. The discovery of ETP9's role in endosymbiont division opens new avenues for research and understanding of these ancient relationships.
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