Demecolcine-assisted enucleation for bovine cloning.
The present study demonstrated that demecolcine treatment for at least 30 min produces a membrane protrusion in metaphase II-stage bovine oocytes. The maternal chromosome mass is condensed within the protrusion, which makes it easy to remove the maternal chromosomes for nuclear transfer (NT). Maturation promoting factor activity, but not mitogen-activated protein kinase activity, increased up to 30% in oocytes during demecolcine treatment. One normal healthy calf was obtained after transfer of four NT blastocysts produced following demecolcine treatment. Demecolcine treatment did not increase the potential of NT oocytes to develop into blastocysts. The present study demonstrated that chemically-assisted removal of chromosomes is effective for bovine cloning.
Laboratory of Animal Reproduction, College of Agriculture, Kinki University, Nara, Japan.
Tetsuya
T
Tani
Hiroaki
H
Shimada
Yoko
Y
Kato
Yukio
Y
Tsunoda
D000199:Actins / Q000032:analysis; D000818:Animals; D001665:Binding Sites; D001755:Blastocyst / Q000166:cytology; D002417:Cattle; D033481:Chromosomes, Mammalian / Q000187:drug effects; D019976:Cloning, Organism / Q000379:methods*; D003208:Concanavalin A / Q000378:metabolism; D003703:Demecolcine / Q000494:pharmacology*; D004624:Embryo Transfer; D005260:Female; D016200:Maturation-Promoting Factor / Q000032:analysis; D008856:Microscopy, Fluorescence; D020929:Mitogen-Activated Protein Kinase Kinases / Q000032:analysis; D053652:Nuclear Transfer Techniques; D009865:Oocytes / Q000737:chemistry / Q000187:drug effects*; D011247:Pregnancy; D011494:Protein Kinases / Q000378:metabolism; D013997:Time Factors
D000199:Actins; D003208:Concanavalin A; D011494:Protein Kinases; C102333:histone H1 kinase; D016200:Maturation-Promoting Factor; D020929:Mitogen-Activated Protein Kinase Kinases; D003703:Demecolcine