Circadian oscillation and development-dependent expression of glycine-rich RNA binding proteins in tomato fruits
Gabriela L. Müller A B , Agustina Triassi A , Clarisa E. Alvarez A , María L. Falcone Ferreyra A , Carlos S. Andreo A , María V. Lara A and María F. Drincovich A
+ Author Affiliations
- Author Affiliations
A Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Facultad de Ciencias Bioquímicas y Farmacéuticas, Suipacha 531, Rosario (2000), Argentina.
B Corresponding author. Email: muller@cefobi-conicet.gov.ar
Functional Plant Biology 41(4) 411-423 https://doi.org/10.1071/FP13239
Submitted: 7 August 2013 Accepted: 22 October 2013 Published: 28 November 2013
Abstract
Glycine-rich RNA-binding proteins (GRPs) are involved in the modulation of the post-transcriptional processing of transcripts and participate as an output signal of the circadian clock. However, neither GRPs nor the circadian rhythmic have been studied in detail in fleshy fruits as yet. In the present work, the GRP1 gene family was analysed in Micro-Tom tomato (Solanum lycopersicum L.) fruit. Three highly homologous LeGRP1 genes (LeGRP1a–c) were identified. For each gene, three products were found, corresponding to the unspliced precursor mRNA (pre-mRNA), the mature mRNA and the alternatively spliced mRNA (preLeGRP1a–c, mLeGRP1a–c and asLeGRP1a–c, respectively). Tomato GRPs (LeGRPs) show the classic RNA recognition motif and glycine-rich region, and were found in the nucleus and in the cytosol of tomato fruit. By using different Escherichia coli mutants, it was found that LeGRP1s contained in vivo RNA-melting abilities and were able to complement the cold-sensitive phenotype of BX04 cells. Particular circadian profiles of expression, dependent on the fruits’ developmental stage, were found for each LeGRP1 form. During ripening off the vine of fruits harvested at the mature green stage, the levels of all LeGRP1a–c forms drastically increased; however, incubation at 4°C prevented such increases. Analysis of the expression of all LeGRP1a–c forms suggests a positive regulation of expression in tomato fruit. Overall, the results obtained in this work reveal a complex pattern of expression of GRPs in tomato fruit, suggesting they might be involved in post-transcriptional modulation of circadian processes of this fleshy fruit.
Additional keywords: alternative spliced products, circadian rhythm, post-transcriptional modulation, Solanum lycopersicum.
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