Tang Haibao, Bowers John E, Wang Xiyin, Ming Ray, Alam Maqsudul, Paterson Andrew H
Plant Genome Mapping Laboratory, University of Georgia, Athens, GA 30602, USA.
Science. 2008 Apr 25;320(5875):486-8. doi: 10.1126/science.1153917.
Correlated gene arrangements among taxa provide a valuable framework for inference of shared ancestry of genes and for the utilization of findings from model organisms to study less-well-understood systems. In angiosperms, comparisons of gene arrangements are complicated by recurring polyploidy and extensive genome rearrangement. New genome sequences and improved analytical approaches are clarifying angiosperm evolution and revealing patterns of differential gene loss after genome duplication and differential gene retention associated with evolution of some morphological complexity. Because of variability in DNA substitution rates among taxa and genes, deviation from collinearity might be a more reliable phylogenetic character.
分类群之间相关的基因排列为推断基因的共同祖先以及利用模式生物的研究结果来研究了解较少的系统提供了一个有价值的框架。在被子植物中，基因排列的比较因反复出现的多倍体现象和广泛的基因组重排而变得复杂。新的基因组序列和改进的分析方法正在阐明被子植物的进化，并揭示基因组复制后不同的基因丢失模式以及与某些形态复杂性进化相关的不同基因保留模式。由于不同分类群和基因之间DNA替代率存在差异，偏离共线性可能是一个更可靠的系统发育特征。
