Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7

Streitner C, Hennig L, Korneli C, Staiger D (2010)
BMC Plant Biology 10(1): 221.

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Abstract / Bemerkung
Background: The clock-controlled RNA-binding protein AtGRP7 influences circadian oscillations of its own transcript at the post-transcriptional level. To identify additional targets that are regulated by AtGRP7, transcript profiles of transgenic plants constitutively overexpressing AtGRP7 (AtGRP7-ox) and wild type plants were compared. Results: Approximately 1.4% of the transcripts represented on the Affymetrix ATH1 microarray showed changes in steady-state abundance upon AtGRP7 overexpression. One third of the differentially expressed genes are controlled by the circadian clock, and they show a distinct bias of their phase: The up-regulated genes preferentially peak around dawn, roughly opposite to the AtGRP7 peak abundance whereas the down-regulated genes preferentially peak at the end of the day. Further, transcripts responsive to abiotic and biotic stimuli were enriched among AtGRP7 targets. Transcripts encoding the pathogenesis-related PR1 and PR2 proteins were elevated in AtGRP7-ox plants but not in plants overexpressing AtGRP7 with a point mutation in the RNA-binding domain, indicating that the regulation involves RNA binding activity of AtGRP7. Gene set enrichment analysis uncovered components involved in ribosome function and RNA metabolism among groups of genes upregulated in AtGRP7-ox plants, consistent with its role in post-transcriptional regulation. Conclusion: Apart from regulating a suite of circadian transcripts in a time-of-day dependent manner AtGRP7, both directly and indirectly, affects other transcripts including transcripts responsive to abiotic and biotic stimuli. This suggests a regulatory role of AtGRP7 in the output of the endogenous clock and a complex network of transcripts responsive to external stimuli downstream of the AtGRP7 autoregulatory circuit.
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BMC Plant Biology
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10
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1
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221
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Streitner C, Hennig L, Korneli C, Staiger D. Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7. BMC Plant Biology. 2010;10(1):221.
Streitner, C., Hennig, L., Korneli, C., & Staiger, D. (2010). Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7. BMC Plant Biology, 10(1), 221. doi:10.1186/1471-2229-10-221
Streitner, C., Hennig, L., Korneli, C., and Staiger, D. (2010). Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7. BMC Plant Biology 10, 221.
Streitner, C., et al., 2010. Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7. BMC Plant Biology, 10(1), p 221.
C. Streitner, et al., “Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7”, BMC Plant Biology, vol. 10, 2010, pp. 221.
Streitner, C., Hennig, L., Korneli, C., Staiger, D.: Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7. BMC Plant Biology. 10, 221 (2010).
Streitner, Corinna, Hennig, Lars, Korneli, Christin, and Staiger, Dorothee. “Global transcript profiling of transgenic plants constitutively overexpressing the RNA-binding protein AtGRP7”. BMC Plant Biology 10.1 (2010): 221.
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