Sperm turn their neck to turn right, study
A new study, which might help improve -vitro fertilisation (IVF) and fertility treatments, has shown that sperm is required to move their neck to turn right in order to control the left-turning movement result by the movement of their tails.
The team of researchers at the University of Warwick in London have found that sperm tails rotate in a counter-clockwise motion as it propels sperm to move against the motion of a fluid. As thetails move in a counter-clockwise motion, the sperm are only able to move in a leftwards direction, however, about half of the sperms observed in the experiment were able to move to the right.
The researchers used 3D motion analysis of the sperm to find that the sperm were able to distort their bodies at the mid-piece to counteract the physical forces and were thus able to turn towards the right. The researchers found that there could be two physiologically distinct spermatozoa subpopulations.
VasilyKantsler of the University of Warwick who led the study, said, “We recently have learned that the sperm swim primarily near surfaces, which turned to be crucial for understanding why they navigate against a fluid flow. Analysing the 3D details of how a sperm's flagella beat, we have realised that all the cells rotate their flagella anti-clockwise, which would make them to turn left only. At the same time we have noticed the right moving sperm also have a right bent in the mid-piece section of the flagella providing a force, which would counteract the left-turning.”
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