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- Title
Production of calves from G1 fibroblasts.
- Authors
Kasinathan, Poothappillai; Knott, Jason G.; Wang, Zhongde; Jerry, D. Joseph; Robl, James M.
- Abstract
Since the landmark study of Wilmut et al. describing the birth of a cloned lamb derived from a somatic cell nucleus, there has been debate about the donor nucleus cell cycle stage required for somatic cell nuclear transfer (NT). Wilmut et al. suggested that induction of quiescence by serum starvation was critical in allowing donor somatic cells to support development of cloned embryos. In a subsequent report, Cibelli et al. proposed that GO was unnecessary and that calves could be produced from actively dividing fibroblasts. Neither study conclusively documented the importance of donor cell cycle stage for development to term. Other laboratories have had success with NT in several species, and most have used a serum starvation treatment. Here we evaluate methods for producing GO and G1 cell populations and compare development following NT. High confluence was more effective than serum starvation for arresting cells in GO. Pure G1 cell populations could be obtained using a "shakeoff" procedure. No differences in in vitro development were observed between cells derived from the high-confluence treatment and from the "shake-off" treatment. However, when embryos from each treatment were transferred to 50 recipients, five calves were obtained from embryos derived from "shake-off" cells, whereas no embryos from confluent cells survived beyond 180 days of gestation. These results indicate that donor cell cycle stage is important for NT, particularly during late fetal development, and that actively dividing G1 cells support higher development rates than cells in G0.
- Subjects
CALVES; FIBROBLASTS; CLONING
- Publication
Nature Biotechnology, 2001, Vol 19, Issue 12, p1176
- ISSN
1087-0156
- Publication type
Article
- DOI
10.1038/nbt1201-1176