Abstract
Mouse round spermatids were electrofused with homologous mature oocytes to examine the behaviour of their nuclei within the ooplasm and the abilities of development. A single spermatid was injected in the perivitelline space of a mature oocyte and an electron fusion pulse was given. The best round spermatid-oocyte pairs (RS-O) fusion took place at 20–30 s AC (1 MHz, 50V/cm) followed by a single fusion DC pulse (3 700-3 800 V/cm, 25 μs) and another 30 s AC current. The total survival rate and fusion rate of RS-O were 89.0% (575/646) and 61.9 % (356/575), respectively. 49.2 % (175/356) of fused oocytes developed to 2PN stage. The concentration of Ca2+ in the fusion medium produced no significant effect on the above targets. The 2PN development rate of the fused RS-O from the oocytes collected 14–16 h after hCG injection was higher than others. 32.6% (57/175) of the 2PN oocytes had fully developed spermatid (male) and oocyte (female) pronuclei. The rest spermatid-derived pronuclei remained small in size throughout the pronuclear stage. 192 fertilized eggs were transferred surgically into the oviducts of the pseudopregnant female mouse. 12 offspring were produced.
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Project supported by the State Key Laboratory of Reproductive Biology.
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Liu, L., Sun, Q., Duan, C. et al. Subzonal fertilization of mouse round spermatids. Sci. China Ser. C.-Life Sci. 40, 152–158 (1997). https://doi.org/10.1007/BF02882043
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DOI: https://doi.org/10.1007/BF02882043