Some mouse sperm try to sabotage rivals in race to fertilise the egg

Sperm have one goal – to reach the egg and fertilise it – and it seems that some mouse sperm cells carrying a certain genetic mutation may boost their chances of doing so by sabotaging their rivals. Bernhard Herrmann at the Max Planck Institute for Molecular Genetics in Berlin, Germany, and his colleagues analysed sperm samples from mice. They found that sperm from some mice, carrying a genetic variant called the t haplotype, move faster and swim in straight lines. Other sperm without this variant from the same mice swim less productively, often moving slower and in circles. Previous research has shown that mice with two copies the t haplotype genetic variant are more likely to be infertile, but this new study suggests that males with one copy of the…
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