Synthetic Genomics Research Group, RIKEN Center for Sustainable Resource Science, Yokohama, Japan.
Biodiversity Division, National Institute for Environmental Studies, Tsukuba, Japan.
Nat Commun. 2021 Jun 16;12(1):3593. doi: 10.1038/s41467-021-23741-5.
Photoreceptors are conserved in green algae to land plants and regulate various developmental stages. In the ocean, blue light penetrates deeper than red light, and blue-light sensing is key to adapting to marine environments. Here, a search for blue-light photoreceptors in the marine metagenome uncover a chimeric gene composed of a phytochrome and a cryptochrome (Dualchrome1, DUC1) in a prasinophyte, Pycnococcus provasolii. DUC1 detects light within the orange/far-red and blue spectra, and acts as a dual photoreceptor. Analyses of its genome reveal the possible mechanisms of light adaptation. Genes for the light-harvesting complex (LHC) are duplicated and transcriptionally regulated under monochromatic orange/blue light, suggesting P. provasolii has acquired environmental adaptability to a wide range of light spectra and intensities.
光感受器在绿藻到陆生植物中是保守的，调节着各种发育阶段。在海洋中，蓝光比红光穿透得更深，而蓝光感应是适应海洋环境的关键。在这里，在海洋宏基因组中搜索蓝光光感受器，揭示了在甲藻 Pycnococcus provasolii 中一种由光敏色素和隐花色素组成的嵌合基因（Dualchrome1，DUC1）。DUC1 在橙色/远红光和蓝光光谱范围内检测光，并作为双光受体。对其基因组的分析揭示了光适应的可能机制。在单色橙色/蓝光下，光捕获复合物（LHC）的基因被复制和转录调控，这表明 P. provasolii 已经获得了对广泛的光光谱和强度的环境适应性。
