Gallois J L, Achard P, Green G, Mache R
Laboratoire de Génétique Moléculaire des Plantes, Université J. Fourier and Centre National de la Recherche Scientifique, BP 53, F-38041 Grenoble Cedex 09, France.
Gene. 2001 Aug 22;274(1-2):179-85. doi: 10.1016/s0378-1119(01)00613-8.
Many chloroplast genes of cyanobacterial origin have been transferred to the nucleus during evolution and their products are re-addressed to chloroplasts. The RPL21 gene encoding the plastid r-protein L21 has been lost in higher plant chloroplast genomes after the divergence from bryophytes. Based on phylogenetic analysis and intron conservation, we now provide evidence that in Arabidopsis a nuclear RPL21c gene of mitochondrial origin has replaced the chloroplast gene. The control of expression of this gene has been adapted to the needs of chloroplast development by the acquisition of plastid-specific regulatory promoter cis-elements.
许多起源于蓝细菌的叶绿体基因在进化过程中已转移至细胞核，其产物又重新定位于叶绿体。编码质体核糖体蛋白L21的RPL21基因在与苔藓植物分化后，已在高等植物叶绿体基因组中丢失。基于系统发育分析和内含子保守性，我们现在提供证据表明，拟南芥中一个源于线粒体的核RPL21c基因已取代了叶绿体基因。通过获得质体特异性调控启动子顺式元件，该基因的表达调控已适应叶绿体发育的需求。
