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Birth of mice after intracytoplasmic injection of single purified sperm nuclei and detection of messenger RNAs and MicroRNAs in the sperm nuclei.

We have developed a method that effectively removes all of the perinuclear materials of a mouse sperm head, including the acrosome, plasma membrane, perinuclear theca, and nuclear envelope. By injection of a single purified sperm head into a metaphase II mouse oocyte followed by activation with strontium chloride, 93% of the zygotes developed into two-cell embryos. Although only approximately 17% of the transferred two-cell embryos were born alive, all live pups developed into adults, and they appeared to be normal in reproduction and behavior. We detected RNA species, including mRNAs and miRNAs from the purified sperm heads. Our data demonstrate that pure membrane-free sperm heads are sufficient to produce normal offspring through intracytoplasmic sperm injection and that at least part of the RNA molecules are deeply embedded in the sperm nucleus.