玉米副突变及其分子机制  

Paramutation and its molecular mechanisms in maize

作　　者：杨同文[1,2] 李潮海[2] 

机构地区：[1]周口师范学院植物遗传与分子育种重点实验室,周口466000 [2]河南农业大学河南省作物生长和发育调控重点实验室,郑州450002

出　　处：《生命的化学》2012年第2期189-195,共7页Chemistry of Life

基　　金：河南省科技厅自然科学基金项目(092300410074);河南省高校科技创新人才支持计划(2010HASTIT015);周口师范学院重点学科建设经费项目资助

摘　　要：副突变是一种表观遗传现象,通过同源基因间染色质状态信息的转移建立新的基因表达状态,这种表达状态能够通过减数分裂而传递到后代。玉米是研究副突变及其机制的模式植物,目前已经发现有5个基因位点能够发生副突变。对玉米b1副突变系统的广泛研究发现DNA重复序列、siRNA途径、DNA结合蛋白等在副突变状态的建立和维持过程中可能起着重要的作用。Paramutation is an epigenetic phenomenon,which establishes a gene expression state through information transfer of chromatin state between homologous genes,and the new expression state can be transferred through meiosis to the following generation.Maize is a model plant for the study of paramutation and its mechanisms.Five loci paramutation have been discovered in maize so far.The studies on b1 paramutation system in maize have outlined a picture of the mechanism.It is possible that DNA tandem repeats,siRNA pathway and DNA-binding protein play important roles in the establishment and maintenance of the paramutation state in maize.

关 键 词：玉米 副突变 串联重复 siRNA途径 

分 类 号：S513[农业科学—作物学]