与单子叶植物相比，双子叶植物中 11S 球蛋白基因的基因重复和进化速率的加快与更高的蛋白质合成有关。
Gene duplication and an accelerated evolutionary rate in 11S globulin genes are associated with higher protein synthesis in dicots as compared to monocots.
机构信息
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, PR China.
出版信息
BMC Evol Biol. 2012 Jan 31;12:15. doi: 10.1186/1471-2148-12-15.
BACKGROUND
Seed storage proteins are a major source of dietary protein, and the content of such proteins determines both the quantity and quality of crop yield. Significantly, examination of the protein content in the seeds of crop plants shows a distinct difference between monocots and dicots. Thus, it is expected that there are different evolutionary patterns in the genes underlying protein synthesis in the seeds of these two groups of plants.
RESULTS
Gene duplication, evolutionary rate and positive selection of a major gene family of seed storage proteins (the 11S globulin genes), were compared in dicots and monocots. The results, obtained from five species in each group, show more gene duplications, a higher evolutionary rate and positive selections of this gene family in dicots, which are rich in 11S globulins, but not in the monocots.
CONCLUSION
Our findings provide evidence to support the suggestion that gene duplication and an accelerated evolutionary rate may be associated with higher protein synthesis in dicots as compared to monocots.
背景
种子贮藏蛋白是膳食蛋白质的主要来源，其含量决定了作物产量的数量和质量。重要的是，对作物种子中蛋白质含量的研究表明，单子叶植物和双子叶植物之间存在明显差异。因此，可以预期这两组植物种子中蛋白质合成的相关基因存在不同的进化模式。
结果
比较了双子叶植物和单子叶植物中种子贮藏蛋白（11S 球蛋白基因）这一大基因家族的基因复制、进化率和正选择。从每组的 5 个物种中获得的结果表明，富含 11S 球蛋白的双子叶植物中该基因家族的基因复制更多，进化率更高，正选择也更多，而在单子叶植物中则没有。
结论
我们的研究结果为以下观点提供了证据支持，即与单子叶植物相比，基因复制和进化率的加速可能与双子叶植物中更高的蛋白质合成有关。
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