Factors affecting Cloning by Somatic Cell Nuclear Transfer (SCNT) in Camels — ASN Events

Factors affecting Cloning by Somatic Cell Nuclear Transfer (SCNT) in Camels (#208)

Nisar A Wani 1
  1. Reproductive Biotechnology Center, Dubai, United Arab Emirates

Cloning by SCNT has a special significance in the genetic improvement of camels and can be used to produce elite males; racing champions; animals with the highest potential for milk production, or the prized beauty camels. Optimization of the techniques for dromedary oocyte maturation, ultrasound guided transvaginal ovum pick-up, chemical activation of mature oocytes  and in vitro embryo culture during the past few years in our lab was the basis for production of world’s first cloned camel (Wani et al., 2010). Injaz, who was born on April 8th 2009, has been produced from the embryo reconstructed with cumulus cell, however, we were successful in producing a cloned camel from the embryo reconstructed with the skin fibroblast of an elite live bull in Feb. 2010. Many more cloned calves have been produced in subsequent years from both cell types. We have demonstrated that both cumulus and skin fibroblast cells from camel can be reprogrammed in reconstructed embryos and such embryos can lead to gestation and the birth of a cloned calves following embryo transfer. This has opened doors for the amelioration and preservation of genetically valuable animals by harvesting the donor cells from a small skin sample from such animals. In order to optimize the nuclear transfer procedure and to make efficient use of the limited number of oocytes available in this species, we compared in vitro matured oocytes obtained from slaughterhouse ovaries and in vivo matured oocytes obtained from stimulated donors by ultrasound guided transvaginal ovum pick-up for their developmental potential after embryo reconstruction by SCNT. We also compared different cell types and cell treatments in the development of reconstructed embryos in vitro, their in vivo development after transfer into recipient surrogate mothers and live births. Studies were also conducted on the synchronization of recipients and their management after cloned embryos were transferred to them. This presentation will discuss affect of different factors on in vitro and in vivo development of reconstructed embryos, current challenges and the future strategies to be applied in order to enhance the use of this technology for application in camelids. 

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