The influence of cytoplasmic age on the development of embryos made by nuclear transfer

Lavoir, M.-C.; Rumph, N; Fuente, Rabindranath De La; Barnes, Frank L.; King, W.A.; Betteridge, K.J.

doi:10.1016/0093-691x(96)84759-5

Cited by 4 publications

(1 citation statement)

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“…Other studies have examined structural and functional reprogramming events in reconstructed embryos, including nucleolar and mitochondrial morphology (31), nuclear swelling (32), and the exchange of somatic histone H1 subtypes (25). These studies have demonstrated that nuclear reprogramming takes place over several cell cycles and may be delayed or incomplete in the transferred nucleus (32,33). Recently, a differential display analysis that compared cDNA profiles between nuclear-transferred bovine blastocysts with in vivo-and in vitro-derived blastocysts demonstrated that most but not all of the mRNAs are reprogrammed in cloned embryos (34).…”

Section: Discussionmentioning

confidence: 99%

Reprogramming of telomerase activity and rebuilding of telomere length in cloned cattle

Betts¹

2001

Proceedings of the National Academy of Sciences

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Nuclear reprogramming requires the removal of epigenetic modifications imposed on the chromatin during cellular differentiation and division. The mammalian oocyte can reverse these alterations to a state of totipotency, allowing the production of viable cloned offspring from somatic cell nuclei. To determine whether nuclear reprogramming is complete in cloned animals, we assessed the telomerase activity and telomere length status in cloned embryos, fetuses, and newborn offspring derived from somatic cell nuclear transfer. In this report, we show that telomerase activity was significantly (P < 0.05) diminished in bovine fibroblast donor cells compared with embryonic stem-like cells, and surprisingly was 16-fold higher in fetal fibroblasts compared with adult fibroblasts (P < 0.05). Cell passaging and culture periods under serum starvation conditions significantly decreased telomerase activity by approximately 30 -50% compared with nontreated early passage cells (P < 0.05). Telomere shortening was observed during in vitro culture of bovine fetal fibroblasts and in very late passages of embryonic stem-like cells. Reprogramming of telomerase activity was apparent by the blastocyst stage of postcloning embryonic development, and telomere lengths were longer (15-23 kb) in cloned fetuses and offspring than the relatively short mean terminal restriction fragment lengths (14 -18 kb) observed in adult donor cells. Overall, telomere lengths of cloned fetuses and newborn calves (Ϸ20 kb) were not significantly different from those of age-matched control animals (P > 0.05). These results demonstrate that cloned embryos inherit genomic modifications acquired during the donor nuclei's in vivo and in vitro period but are subsequently reversed during development of the cloned animal.

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Section: Discussionmentioning

confidence: 99%

Reprogramming of telomerase activity and rebuilding of telomere length in cloned cattle

Betts¹

2001

Proceedings of the National Academy of Sciences

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Influence of the timing of blastomere isolation after the removal of nocodazole in bovine nuclear transfer

Tanaka

1999

Theriogenology

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Influence of combined activation treatments on the success of bovine nuclear transfer using young or aged oocytes

Tanaka

Kanagawa

1997

Animal Reproduction Science

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The influence of cytoplasmic age on the development of embryos made by nuclear transfer

Cited by 4 publications

References 0 publications

Reprogramming of telomerase activity and rebuilding of telomere length in cloned cattle

Reprogramming of telomerase activity and rebuilding of telomere length in cloned cattle

Influence of the timing of blastomere isolation after the removal of nocodazole in bovine nuclear transfer

Influence of combined activation treatments on the success of bovine nuclear transfer using young or aged oocytes

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