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              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 14-10-2016)  
              6. 
				
				
				Polyadenylated tail length variation 
				pattern in ultra-rapid vitrified bovine oocytes - 
				
				
				D. J. Dutta, Himangshu Raj and Hiramoni Dev 
              
              Veterinary World, 9(10): 1070-1074   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2016.1070-1074 
                
				  
				
				D. J. Dutta: 
				
				Department of Veterinary Physiology, Faculty of Veterinary 
				Science, Assam Agricultural University, Khanapara, Guwahati - 
				781 022, Assam, India; duttadj@hotmail.com 
				
				Himangshu Raj: 
				
				Department of Veterinary Physiology, Faculty of Veterinary 
				Science, Assam Agricultural University, Khanapara, Guwahati - 
				781 022, Assam, India; xrajxyz@yahoo.co.in 
				
				Hiramoni Dev: 
				
				Department of Veterinary Physiology, Faculty of Veterinary 
				Science, Assam Agricultural University, Khanapara, Guwahati - 
				781 022, Assam, India; drhsd@rediffmail.com   
				
				Received: 18-02-2016, Accepted: 28-08-2016, Published online: 
				14-10-2016   
				
              	
              	Corresponding author: 
              	
				
				D. J. Dutta, e-mail: duttadj@hotmail.com 
 
              Citation: 
				
				Dutta DJ, Raj H, Dev H (2016) Polyadenylated tail length 
				variation pattern in ultra-rapid vitrified bovine oocytes,
				
				
				Veterinary World, 9(10): 
				1070-1074. 
 
              
				Abstract 
 
				
				
				Aim: 
				
				The current study aims at investigating the polyadenylated (poly[A]) 
				tail length of morphologically high and low competent oocytes at 
				different developmental stages. Furthermore, effect of 
				ultra-rapid vitrification on the poly(A) tail length was 
				studied. 
				
				
				Materials and Methods: 
				
				Fresh bovine cumulus oocyte complexes from abattoir originated 
				ovaries were graded based on morphological characters and 
				matured 
				
				in vitro. 
				Cryopreservation was done by ultra-rapid vitrification method. 
				mRNA was isolated from different categories of oocyte and 
				subjected to ligation-mediated poly(A) test followed by 
				polymerase chain reaction for determining the poly(A) tail 
				length of β actin, gap junction protein alpha 1 (GJA1), poly(A) 
				polymerase alpha (PAPOLA), and heat shock 70 kDa protein (HSP70) 
				transcripts. 
				
				
				Results: 
				
				GJA1, PAPOLA, and HSP70 showed significantly higher poly(A) in 
				immature oocytes of higher competence irrespective of 
				vitrification effects as compared to mature oocytes of higher 
				competence. 
				
				
				Conclusion: 
				
				mRNA poly(A) tail size increases in developmentally high 
				competent immature bovine oocytes. There was limited effect of 
				ultra-rapid vitrification of bovine oocytes on poly(A). 
				
				Keywords: 
				
				ligation-mediated poly(A) test, oocyte, poly-adenylated tail, 
				vitrification. 
 
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