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Title: Aberrant profile of gene expression in cloned mouse embryos derived from donor cumulus nuclei
Authors: Tong, G.Q.
Heng, B.C. 
Tan, L.G.
Ng, S.C.
Keywords: Development
Gene expression
Nuclear transfer
Somatic cell
Issue Date: 2006
Citation: Tong, G.Q., Heng, B.C., Tan, L.G., Ng, S.C. (2006). Aberrant profile of gene expression in cloned mouse embryos derived from donor cumulus nuclei. Cell and Tissue Research 325 (2) : 231-243. ScholarBank@NUS Repository.
Abstract: Somatic cell nuclear transfer has successfully been used to clone several mammalian species including the mouse, albeit with extremely low efficiency. This study investigated gene expression in cloned mouse embryos derived from cumulus cell donor nuclei, in comparison with in vivo fertilized mouse embryos, at progressive developmental stages. Enucleation was carried out by the conventional puncture method rather than by the piezo-actuated technique, whereas nuclear transfer was achieved by direct cumulus nuclear injection. Embryonic development was monitored from chemically induced activation on day 0 until the blastocyst stage on day 4. Poor developmental competence of cloned embryos was observed, which was confirmed by lower cell counts in cloned blastocysts, compared with the in vivo fertilized controls. Subsequently, real-time polymerase chain reaction was used to analyze and compare embryonic gene expression at the 2-cell, 4-cell, and blastocyst stages, between the experimental and control groups. The results showed reduced expression of the candidate genes in cloned 2-cell stage embryos, as manifested by poor developmental competence, compared with expression in the in vivo fertilized controls. Cloned 4-cell embryos and blastocysts, which had overcome the developmental block at the 2-cell stage, also showed up-regulated and down-regulated expression of several genes, strongly suggesting incomplete nuclear reprogramming. We have therefore demonstrated that aberrant embryonic gene expression is associated with low developmental competence of cloned mouse embryos. To improve the efficiency of somatic cell nuclear transfer, strategies to rectify aberrant gene expression in cloned embryos should be investigated. © Springer-Verlag 2006.
Source Title: Cell and Tissue Research
ISSN: 0302766X
DOI: 10.1007/s00441-006-0189-1
Appears in Collections:Staff Publications

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