The world's first oldest egg cloned cattle

Introduction: a young bull was born in the pasture of Iwate Prefecture late on the 19th night, according to the Department of agronomy of Iwate University and the Department of gynaecology of Kato, Tokyo, Japan On the 20th, Kato gynecological hospital announced that the human placenta cells cultivated by the method of returning eggs to old age and children have also been successful All these results bring hope for the treatment of infertility in the elderly The researchers said they first took the nucleus of an egg from a 19-year-old cow that was no longer pregnant, then implanted the nucleus into the egg of a young cow, and then inseminated the egg in vitro, and in May last year, implanted the inseminated eggs into the uterus of four other young cows It was confirmed that two of the four cows were pregnant, and one of them gave birth to a calf late on February 19 This is the world's first calf born by the method of egg rejuvenation On the 20th, Kato women's Hospital of gynaecology announced that they had implanted the nucleus of the eggs of women in their 40s into the eggs of women in their 20s who had removed the nucleus of the eggs They made 14 such eggs successively, 6 of which were mature, 5 of which were successfully inseminated in vitro, 1 of which developed into the embryo cell Now they are frozen and preserved After the safety problems are solved, they are replanted into the womb of women Kato gynecological hospital is a special hospital for the treatment of women's infertility Generally speaking, when a woman is over 40 years old, due to the deterioration of egg cells, even if the egg is fertilized, it is difficult for the fertilized egg to get into bed, which has become a major cause of infertility in the elderly Cell degradation is mainly caused by cytoplasmic degradation It is no doubt that the rejuvenation of eggs will bring the hope of fertility to the elderly infertile women As long as the nucleus of the egg is implanted into an egg that has been removed from the nucleus of a young woman, after in vitro fertilization, cultivation, and then the fertilized egg is implanted back into her own uterus, the offspring with the same genetic genes can be produced However, many experts pointed out that the genetic genes of young women who provide young eggs will also be passed on to infants due to the role of mitochondrial DNA in the cytoplasm of their eggs Therefore, children born by this method are likely to have the genetic genes of three parents and young egg providers Moreover, cytoplasmic diseases are also problems that must be solved This nuclear replacement technique is actually a partial cloning technique At present, there are many problems in animal cloning that have not been solved, so we should be very careful when it is used in human body It is said that the Ministry of health, labor and welfare will enact regulations on assisted reproductive health care next year, when the use of third party eggs may be conditionally opened.