Molecular analysis of the loss of somatic instability in the bz2::mu1 allele of maize |
| |
Authors: | Avraham Albert Levy and Virginia Walbot |
| |
Institution: | (1) Department of Biological Sciences, Stanford University, 94305-5020 Stanford, CA, USA;(2) Present address: Laboratoire de Biologie Cellulaire, INRA-Centre de Versailles, F-78026 Versailles Cedex, France |
| |
Abstract: | Summary Multiple genetic and epigenetic changes were detected within one plant generation at the bz2:: mu1 mutable allele in a population of 118 plants. Loss of somatic instability in bz2::mu1 was usually correlated with methylation of the Mu1 transposable element; in 6 plants, somatic instability was lost as a result of mutations in bz2::mu1. This is a surprisingly high frequency of mutation per allele (2.5%) for the Mutator family, for which germinal revertants occur at a frequency of about 10–4 per gamete. One germinal excision event was found that contained an 8 by deletion, frameshift mutation in Bronze-2. The three other mutants described occurred as a result of abortive transposition, in which 75–77 by deletions were generated at the junction between Bronze-2 and Mu1. We discuss the possible mechanisms, and the role of host factors in abortive transposition in maize. |
| |
Keywords: | Mutator Transposable elements Excision Abortive transposition Methylation |
本文献已被 SpringerLink 等数据库收录! |
|