Technical aspects of the piezo, laser-assisted, and conventional methods for nuclear transfer of mouse oocytes and their efficiency and efficacy: Piezo minimizes damage of the ooplasmic membrane at injection.
Assessment of the advantages and disadvantages of the piezo, laser, and conventional methods for nuclear transfer has remained elusive. Furthermore, although the piezo method had been used by some investigators for research of sperm injection and nuclear transfer for several years, many researchers have failed to operate the technique smoothly and achieve reproducible results. The procedures of nuclear transfer using piezo were ascertained and described in detail. Mouse oocytes were enucleated, and injected with cumulus cells using the piezo, laser, or conventional methods. We investigated the time needed and survival of nuclear transfer. Development was compared among the three methods and parthenogenetic control specimens. The average time of nuclear transfer for each oocyte was significantly shorter using the piezo (118 +/- 9 s) and laser methods (120 +/- 11 s) than using the conventional method (170 +/- 11 s). The damage rate was smaller for the piezo group (10%) than the laser (37%) and conventional (40%) groups. The percentages of blastocyst formation (14%, 12%, and 11%) and the number of nuclei of blastocysts (54 +/- 13, 51 +/- 11, and 52 +/- 12) were similar among the piezo, laser, and conventional groups, but significantly lower than for the control group (83%, 105 +/- 14). The piezo technique is more efficient than the conventional method for nuclear transfer. The laser method is easy to operate, but the equipment is expensive. In addition, piezo induced fewer traumas while breaking the membrane than the aspiration techniques used in the laser and conventional methods.
Chen
Shee-Uan
SU
Department of Obstetrics and Gynecology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
Chao
Kuang-Han
KH
Chang
Chia-Yi
CY
Hsieh
Fon-Jou
FJ
Ho
Hong-Nerng
HN
Yang
Yu-Shih
YS
D000818:Animals; D002462:Cell Membrane / Q000502:physiology; D019976:Cloning, Organism / Q000379:methods*; D005260:Female; D007834:Lasers; D051379:Mice; D008845:Microinjections / Q000295:instrumentation* / Q000379:methods*; D053652:Nuclear Transfer Techniques; D009865:Oocytes