Manning, K and Tör, M and Walley, P and Poole, M and Puddephat, I and Thompson, A.J. and King, G.J. and Giovannoni, J.J. and Seymour, G (2006) A Naturally Occurring Epigenetic Mutation in a Gene Encoding an SBP-box Transcription Factor Inhibits Tomato Fruit Ripening. Nature Genetics, 38 (8). pp. 948-952.Full text not available from this repository. (Request a copy)
A major component in the regulatory network controlling fruit ripening is likely to be the gene at the tomato Colorless non-ripening (Cnr) locus1, 2. The Cnr mutation results in colorless fruits with a substantial loss of cell-to-cell adhesion. The nature of the mutation and the identity of the Cnr gene were previously unknown. Using positional cloning and virus-induced gene silencing, here we demonstrate that an SBP-box (SQUAMOSA promoter binding protein–like) gene resides at the Cnr locus. Furthermore, the Cnr phenotype results from a spontaneous epigenetic change in the SBP-box promoter. The discovery that Cnr is an epimutation was unexpected, as very few spontaneous epimutations have been described in plants3, 4. This study demonstrates that an SBP-box gene is critical for normal ripening and highlights the likely importance of epialleles in plant development and the generation of natural variation.
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|Uncontrolled Keywords:||epigenetic mutation, gene encoding, gene expression, genetics, epigenetics, tomato fruit|
|Subjects:||Q Science > QH Natural history > QH426 Genetics
Q Science > QR Microbiology
|Divisions:||Academic Departments > Institute of Science and the Environment
Research Centres > National Pollen and Aerobiology Research Unit
|Depositing User:||Janet Davidson|
|Date Deposited:||19 Jan 2011 19:45|
|Last Modified:||15 Nov 2012 14:49|
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