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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Li, Zhongsen Dilkes, Brian P. Bunde, Chris Maddock, Sheila Hill, Patrea Bidney, Dennis Sun, Xifan Gordon-kamm, William Snyder, Jane Sykes, Louisa Farrell, Jeff Larkins, Brian A. Ross, Margit Woo, Young-min Lowe, Keith Hoerster, George Church, Laura |
| Description | Author Affiliation: Gordon-Kamm W ( Pioneer Hi-Bred, International, Inc., Johnston, IA 50131, USA. william.gordon-kamm@pioneer.com); |
| Abstract | The genome of the Mastreviruses encodes a replication-associated protein (RepA) that interacts with members of the plant retinoblastoma-related protein family, which are putative cell cycle regulators. Expression of ZmRb1, a maize retinoblastoma-related gene, and RepA inhibited and stimulated, respectively, cell division in tobacco cell cultures. The effect of RepA was mitigated by over-expression of ZmRb1. RepA increased transformation frequency and callus growth rate of high type II maize germplasm. RepA-containing transgenic maize calli remained embryogenic, were readily regenerable, and produced fertile plants that transmitted transgene expression in a Mendelian fashion. In high type II, transformation frequency increased with the strength of the promoter driving RepA expression. When a construct in which RepA was expressed behind its native LIR promoter was used, primary transformation frequencies did not improve for two elite Pioneer maize inbreds. However, when LIR:RepA-containing transgenic embryos were used in subsequent rounds of transformation, frequencies were higher in the RepA+ embryos. These data demonstrate that RepA can stimulate cell division and callus growth in culture, and improve maize transformation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Cycle DNA Helicases DNA-Binding Proteins Retinoblastoma Protein Metabolism Trans-Activators Zea Mays Cytology Cell Division Molecular Sequence Data Plants, Genetically Modified Proteins Physiology Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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