Mature spermatozoa are characterized by an head, midpiece and a long tail for locomotion. Now, researchers from the University Hospital Bonn (UKB) and the Transdisciplinary Research Area "Life & Health" at the University of Bonn have found that a loss of the structural protein ACTL7B blocks spermatogenesis in male mice. The cells can no longer develop their characteristic shape and remain in a rather round form. The animals are infertile. The results of the study have now been published in the scientific journal "Development".

A receding hairline, a total loss of hair from the crown, and ultimately, the classical horseshoe-shaped pattern of baldness: Previous research into male pattern hair loss, also termed androgenetic alopecia, has implicated multiple common genetic variants. Human geneticists from the University Hospital of Bonn (UKB) and by the Transdisciplinary Research Unit “Life & Health” of the University of Bonn have now performed a systematic investigation of the extent to which rare genetic variants may also contribute to this disorder. For this purpose, they analyzed the genetic sequences of 72,469 male participants from the UK Biobank project. The analyses identified five significantly associated genes, and further corroborated genes implicated in previous research. The results have now been published in the prestigious scientific journal Nature Communications.

Cisplatin is used successfully in the chemotherapy of testicular cancer. However, patients who develop resistance to the cytostatic drug urgently need alternative therapy options. Researchers at the University Hospital Bonn (UKB) have now been able to elucidate a mechanism underlying cisplatin resistance in testicular cancer. Using CRISPR gene scissors, they identified the NAE1 gene as its driver. Inhibiting this resistance mediator by adding the NAE1 inhibitor MLN4924 not only restores the effect of cisplatin, but also has an additional killing effect on tumor cells. The study results have now been published in the British Journal of Cancer.

Researchers at the Universities of Bonn and Singapore have discovered a new intracellular "smoke detector." The sensor warns of damage to the mitochondria - the microscopic power plants that supply the cell with energy. If it does not function properly, chronic skin diseases can result. The sensor may also be important for unimpaired heart and bowel function. The results have now been published in the journal Nature Immunology.

Hemophilia A is the most common severe form of hemophilia. It affects almost exclusively males. The disease can usually be treated well, but not for all sufferers. A study at the University of Bonn has now elucidated an important mechanism that is crucial for making the therapy effective. The results could help better tailor treatment to patients. They have already been published online in a preliminary version; the final version will soon be published in the "Journal of Clinical Investigation."

The zebrafish serves as a model organism for researchers around the world: it can be used to study important physiological processes that also take place in a similar form in the human body. It is therefore routinely used in the search for possible active substances against diseases. Researchers at the University of Bonn have now described an innovative way to do this. In this process, the larvae fish are made a bit more "human-like". This humanization could make the search for active pharmaceutical substances much more efficient. The results of the pilot study have been published in the journal Cell Chemical Biology.

Our own immune system can become the enemy when mechanisms that are actually protective get out of control. In ANCA-associated vasculitis, excessive inflammatory reactions lead to pulmonary hemorrhages that can be fatal if left untreated. Researchers at the University of Bonn, together with colleagues from Germany, the Netherlands, Switzerland and England, have deciphered a mechanism in mice and patients that leads to the severe disease. The results are now published in the Journal of Experimental Medicine.

The transport of substances across the membrane into the cell is linked to specific membrane transport proteins. Researchers at the University Hospital Bonn (UKB) and the University of Bonn, in collaboration with an international team, have now succeeded in elucidating the molecular structure of a completely new class of such membrane transporters. In addition to the Bonn scientists, researchers from the University of York were also involved. The study has now been published in the journal Nature Communications.