基于转录组信息的甘松MADS-box转录因子家族分析

目的 基于转录组数据筛选鉴定分析甘松Nardostachys jatamansi MADS-box转录因子家族。方法 利用生物信息学的方法全面分析甘松MADS-box基因家族成员的蛋白理化性质、亚细胞定位、基因结构、导肽、信号肽及跨膜结构域、系统进化树。结果 在甘松转录组数据中共鉴定出20个MADS-box转录因子,含有90～365个氨基酸,相对分子质量在10 179.96～41 707.68,理论等电点范围为4.87～10.43,主要在细胞核表达,均含有MADS保守结构域,均不含信号肽、导肽以及跨膜结构域。系统发育分析表明甘松MADS蛋白主要属于TypeII型。结论 利用生物信息学分析手段,鉴定了甘松MADS-box家族转录因子,为甘松深入研究甘松MADS-box蛋白的生物学功能提供参考,为甘松的药用成分合成调控机制提供研究基础,为培育优质甘松新品种提供依据。     

PAF1-complex-mediated histone methylation of FLOWERING LOCUS C chromatin is required for the vernalization-responsive, winter-annual habit in Arabidopsis

The winter-annual habit (which typically involves a requirement for exposure to the cold of winter to flower in the spring) in Arabidopsis thaliana is mainly due to the repression of flowering by relatively high levels of FLC expression. Exposure to prolonged cold attenuates FLC expression through a process known as vernalization and thus permits flowering to occur in the spring. Here we show that the elevated FLC expression characteristic of nonvernalized winter annuals requires two genes, EARLY FLOWERING 7 (ELF7) and EARLY FLOWERING 8 (ELF8), that are homologs of components of the PAF1 complex of Saccharomyces cerevisiae. Furthermore, ELF7 and ELF8 are also required for the expression of other genes in the FLC clade of flowering repressors such as MAF2 and FLM. FLC, FLM, and MAF2 are involved in multiple flowering pathways that account for the broad effects of elf7 and elf8 mutations on flowering behavior. ELF7 and ELF8 are required for the enhancement of histone 3 trimethylation at Lys 4 in FLC chromatin. This modification of FLC chromatin appears to be required to elevate FLC expression to levels that can delay flowering in plants that have not been vernalized. A model of the role of ELF7, ELF8, and other previously described genes in the modification of the chromatin of flowering repressors is presented.     

当归MADS-box生物信息学及SOC1克隆与表达分析

目的 对当归Angelica sinensis MADS-box基因家族进行筛选与生物信息学分析,并对SOC1-4基因进行克隆与表达验证。方法 基于当归全长转录组筛选MADS-box基因家族,利用在线工具进行生物信息学分析,并利用q RT-PCR检测SOC1-4基因在不同材料中的表达水平。结果 当归全长转录组中含有29个MADS-box基因家族成员,可分为10个亚家族,共含有6个保守基序,蛋白质序列长度为49～422 aa,相对分子质量为5 697.56～49 624.90,等电点为5.06～11.00,亚细胞结果显示当归MADS-box基因家族成员分别定位于叶绿体、细胞核、细胞质和线粒体,二级结构预测及3D建模显示同一亚家族结构相似;SOC1-4基因克隆片段与全长转录组测序结果一致;SOC1-4基因随种苗春化作用和植株发育时期延长呈现高表达,在抽薹植株、茎和叶中高表达,而在冷冻规避春化作用种苗中呈现低表达。结论 当归含有29个MADS-box成员,各成员理化性质和结构存在一定的差异,SOC1-4基因表达水平与当归抽薹开花生理调控一致,为当归MADS-box基因家族调控抽薹开花相关研究...