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Molecular Plant Advance Access originally published online on November 15, 2007
Molecular Plant 2008 1(1):167-177; doi:10.1093/mp/ssm018
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© The Author 2007. Published by Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

Blue-Light-Independent Activity of Arabidopsis Cryptochromes in the Regulation of Steady-State Levels of Protein and mRNA Expression

Yue-Jun Yanga, Ze-Cheng Zuoa, Xiao-Ying Zhaoa, Xu Lia, John Klejnotb, Yan Lia, Ping Chenc, Song-Ping Liangc, Xu-Hong Yub, Xuan-Ming Liua,1 and Chen-Tao Lina,b,1

a Bioenergy and Biomaterial Research Center, Hunan University, Changsha 410082, China
b Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA 90095, USA
c College of Life Sciences, Hunan Normal University, Changsha, China

1 To whom correspondence should be addressed. E-mail clin{at}mcdb.ucla.edu, sw_xml{at}hnu.cn.

Cryptochromes are blue-light receptors that mediate blue-light inhibition of hypocotyl elongation and blue-light stimulation of floral initiation in Arabidopsis. In addition to their blue-light-dependent functions, cryptochromes are also involved in blue-light-independent regulation of the circadian clock, cotyledon unfolding, and hypocotyl inhibition. However, the molecular mechanism associated with the blue-light-independent function of cryptochromes remains unclear. We reported here a comparative proteomics study of the light regulation of protein expression. We showed that, as expected, the protein expression of many metabolic enzymes changed in response to both blue light and red light. Surprisingly, some light-regulated protein expression changes are impaired in the cry1cry2 mutant in both blue light and red light. This result suggests that, in addition to mediating blue-light-dependent regulation of protein expression, cryptochromes are also involved in the blue-light-independent regulation of gene expression. Consistent with this hypothesis, the cry1cry2 mutant exhibited reduced changes of mRNA expression in response to not only blue light, but also red light, although the cryptochrome effects on the red-light-dependent gene expression changes are generally less pronounced. These results support a hypothesis that, in addition to their blue-light-specific functions, cryptochromes also play roles in the control of gene expression mediated by the red/far-red-light receptor phytochromes.


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