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Nuclear remodeling and reprogramming in transgenic pig production.
Randall S Prather1, Peter Sutovsky, Jonathan A Green
1Department of Animal Science, University of Missouri at Columbia, Columbia, MO 65211-5300, USA. PratherR@Missouri.Edu
Experimental Biology and Medicine (Maywood, N.J.)
|November 27, 2004
Summary
Cloning pigs via nuclear transfer (NT) is inefficient and can result in abnormal offspring. Understanding early cell cycle events and chromatin remodeling is key to improving cloning success and generating fertile animals.
Area of Science:
- Animal biotechnology
- Reproductive biology
- Genetics
Background:
- Genetic modification of livestock, such as pigs, requires initial alterations in somatic cells.
- These modified somatic cells serve as donors for nuclear transfer (NT) to produce cloned animals.
- Current NT procedures in pigs are inefficient and frequently yield abnormal offspring.
Purpose of the Study:
- To investigate the causes of abnormalities in cloned pigs.
- To understand the critical events occurring in the first cell cycle post-NT.
- To identify factors influencing donor nucleus remodeling by oocyte cytoplasm.
Main Methods:
- Somatic cell nuclear transfer (SCNT) in pigs.
- Analysis of early embryonic development post-NT.
- Assessment of chromatin remodeling and nuclear reconstruction.
Main Results:
- Abnormalities in cloned pigs likely originate in the first cell cycle after NT.
- Potential causes include abnormal donor cells or inadequate oocyte cytoplasm remodeling of the donor nucleus.
- Failure to form a pronucleus-like structure is a key concern.
Conclusions:
- Improving pig cloning efficiency requires a deeper understanding of chromatin remodeling.
- Investigating subsequent developmental gene expression post-NT is crucial.
- Optimizing NT procedures can lead to the generation of more fertile cloned pigs.