Expression pattern of OCT 4, NANOG and HSP 90 β gene in oocytes and various stages of in vitro produced sheep embryos

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  • S RAJA Department of Animal Reproduction, Gynaecology and Obstetrics, Madras Veterinary College
  • S BALASUBRAMANIAN Professor and Head, Veterinary University and Peripheral Hospital, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600 007 India
  • G DHINAKARRAJ Professor and Head, Department of Animal Biotechnology, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu 600 007 India
  • C VEERAPANDIAN Dean, Veterinary College and Research Institute, Orathanadu, Thanjavur


Genes, In vitro fertilization, Parthenogenetic activation, Quantitative real time PCR, Sheep


The study was conducted to assess the expression pattern of pluripotent genes (OCT 4 and NANOG) and stress response gene HSP 90 ß by quantitative real time polymerase chain reaction (qRT-PCR) in immature and mature oocytes and 2 cell, 4 cell, morula stages of in vitro fertilized (IVF) and parthenogenetically activated (PA) preimplantation ovine embryos to investigate the similarity between them in turn for the establishment of embryonic stem cells (ESCs) from parthenote embryos. The pluripotent related genes showed almost similar pattern of expression between IVF and PA embryos at all the developmental stages which indicated that PA embryos could be used as an alternate source for the production of embryonic stem cells. The stress response gene showed increased levels after in vitro maturation and non significant differences between IVF and PA embryos, thus, indicating no significant differences between the quantum of stress experienced by the 2 groups of embryos which would not affect the development of embryo quality and in turn affect the parthenote embryonic stem cells (PESCs).


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How to Cite

RAJA, S., BALASUBRAMANIAN, S., DHINAKARRAJ, G., & VEERAPANDIAN, C. (2015). Expression pattern of OCT 4, NANOG and HSP 90 β gene in oocytes and various stages of in vitro produced sheep embryos. The Indian Journal of Animal Sciences, 85(11), 1187–1189.