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Volume 152, Issue 11

Novel light-regulated genes in : a dissection by cDNA microarrays Free

Abstract

The influence of light on living organisms is critical, not only because of its importance as the main source of energy for the biosphere, but also due to its capacity to induce changes in the behaviour and morphology of nearly all forms of life. The common soil fungus responds to blue light in a synchronized manner, in time and space, by forming a ring of green conidia at what had been the colony perimeter at the time of exposure (photoconidiation). A putative complex formed by the BLR-1 and BLR-2 proteins in appears to play an essential role as a sensor and transcriptional regulator in photoconidiation. Expression analyses using microarrays containing 1438 unigenes were carried out in order to identify early light response genes. It was found that 2.8 % of the genes were light responsive: 2 % induced and 0.8 % repressed. Expression analysis in deletion mutants allowed the demonstration of the occurrence of two types of light responses, a -independent response in addition to the expected -dependent one, as well as a new role of the BLR proteins in repression of transcription. Exposure of to continuous light helped to establish that the light-responsive genes are subject to photoadaptation. Finally, evidence is provided of red-light-regulated gene expression and a possible crosstalk between the blue and red light signalling pathways.

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Keyword(s): EST, expressed sequence tag , LRE, light-responsive element and WCC, white collar complex
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2006-11-01
2024-04-25
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Novel light-regulated genes in Trichoderma atroviride: a dissection by cDNA microarrays
Microbiology 152, 3305 (2006); https://doi.org/10.1099/mic.0.29000-0
/content/journal/micro/10.1099/mic.0.29000-0
/content/journal/micro/10.1099/mic.0.29000-0
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