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Sperm selection by thermotaxis improves ICSI outcome in mice
Collectively, our results indicate that a high quality sperm subpopulation is selected in vitro by thermotaxis and that this subpopulation is also selected in vivo within the fallopian tube possibly by thermotaxis.
www.nature.com/articles/s41598-018-21335-8
223. Can Sperm selection by thermotaxis improve ICSI outcome? [Forum/Discussion]
from: Administrator (office@fertaid.com), Australia on 31/05/2018 11:24:05 PM Profession:
Comment: Sperm selected by a warmer temperature gradient appear to have less DNA damage, better qualities and possibly better embryo quality.
Submission: Currently, the intracytoplasmic sperm injection (ICSI) is the preferred Assisted Reproductive Technology (ART) for the treatment of infertility in humans. Furthermore, the interest for its development in farm animals is rising for improving the management of reproductive processes. However, ICSI still inefficient and reports low percentages of pregnancies to term respect to the number of produced embryos. In addition, a concomitant risk of deleterious effects during the life of ICSI derived offspring has been pointed out. It has been suggested that one of the reasons for these issues is the lack of an effective technique for selecting the spermatozoa. This implies a high probability of injecting spermatozoa with damaged DNA explaining both deleterious and lethal effects on embryos and born descendants. Here we present a novel approach in vitro for the selection of the sperm fraction able to migrate within a temperature gradient by thermotaxis. We show in mouse and human that the DNA ported by this fraction is of much higher integrity than before separation. Moreover, using this selected spermatozoa we achieved a substantial improvement of the ICSI outcome in mouse. Finally we found that this sperm subpopulation show the same distribution of the thermosensor rhodopsin than the spermatozoa selected in vivo within the mouse oviduct suggesting that thermotaxis operates as both guidance and selection mechanism of spermatozoa in vivo. The results discussed here could be of high impact at different social, economic and scientific levels. The use of thermotaxis for selecting spermatozoa opens new possibilities for improving ARTs, increasing the success of the fertility treatments in human and veterinary clinics, and reduce the risk of long term effect associated with ICSI. Furthermore, separation of the thermotactic responsive spermatozoa allows analyzing in deep these capacitated cells which will provide novel and valuable knowledge on basic sperm biology.
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