LEAFY HEAD2,which encodes a putative RNA-binding protein,regulates shoot development of rice

During vegetative development, higher plants continuously form new leaves in regular spatial and temporal patterns. Mutants with abnormal leaf developmental patterns not only provide a great insight into understanding the regulatory mechanism of plant architecture, but also enrich the ways to its modification by which crop yield could be improved. Here, we reported the characterization of the rice leafy-head2 （lhd2） mutant that exhibits shortened plastochron, dwarfism, reduced tiller number, and failure of phase transition from vegetative to reproductive growth. Anatomical and histological study revealed that the rapid emergence of leaves in lhd2 was resulted from the rapid initiation of leaf primordia whereas the reduced tiller number was a consequence of the suppression of the tiller bud outgrowth. The molecular and genetic analysis showed that LHD2 encodes a putative RNA binding protein with 67% similarity to maize TEl. Comparison of genome-scale expression profiles between wild-type and lhd2 plants suggested that LHD2 may regulate rice shoot development through KNOXand hormone-related genes. The similar phenotypes caused by LHD2 mutation and the conserved expression pattern of LHD2 indicated a conserved mechanism in controlling the temporal leaf initiation in grass.

Involvement of XZFP36L1,an RNA-binding protein,in Xenopus neural development

Xenopus ZFP36L1(zinc finger protein 36,C3H type-like 1)belongs to the ZFP36 family of RNA-binding proteins,which contains two characteristic tandem CCCH-type zinc-finger domains.The ZFP36 proteins can bind AU-rich elements in 3'untranslated regions of target mRNAs and promote their turnover.However,the expression and role of ZFP36 genes during neural development in Xenopus embryos remains largely unknown.The present study showed that Xenopus ZFP36L1 was expressed at the dorsal part of the forebrain,forebrain-midbrain boundary,and midbrain-hindbrain boundary from late neurula stages to tadpole stages of embryonic development.Overexpression of XZFP36L1 in Xenopus embryos inhibited neural induction and differentiation,leading to severe neural tube defects.The function of XZP36L1 requires both its zinc finger and C terminal domains,which also affect its subcellular localization.These results suggest that XZFP36L1 is likely involved in neural development in Xenopus and might play an important role in post-transcriptional regulation.

Involvement of XZFP36L1, an RNA-binding protein, in Xenopus neural development ＇

Xenopus ZFP36L1 （zinc finger protein 36, C3H type-like 1） belongs to the ZFP36 family of RNA-binding proteins, which contains two characteristic tandem CCCH-type zinc-finger domains. The ZFP36 proteins can bind AU-rich elements in 3＇ untranslated regions of target mRNAs and promote their turnover. However, the expression and role of ZFP36 genes during neural development in Xenopus embryos remains largely unknown. The present study showed that Xenopus ZFP36L1 was expressed at the dorsal part of the forebrain, forebrain-midbrain boundary, and midbrain-hindbrain boundary from late neurula stages to tadpole stages of embryonic development. Overexpression of XZFP36L1 in Xenopus embryos inhibited neural induction and differentiation, leading to severe neural tube defects. The function of XZP36L1 requires both its zinc finger and C terminal domains, which also affect its subcellular localization. These results suggest that XZFP36L1 is likely involved in neural development in Xenopus and might play an important role in post-transcriptional regulation.

Screening and structure analysis of a cDNA encoding RNA-binding protein

WITH the completion of the plant chloroplast genome,it has been revealed that the chloroplastgenome has the characteristics of both prokaryote and eukaryote.Among the chloroplastgenes,in addition to those with introns,there were complex split genes such as rpl 12.Meanwhile,the transcription rate of different genes is apparently different. All these

Musashi-1在前列腺癌中的表达及其临床意义

目的探讨RNA结合蛋白Musashi-1(MSI1)在前列腺癌(PCa)中的表达及其调控功能。方法基于肿瘤基因组图谱(TCGA)数据库对目的基因MSI1进行差异分析、生存分析和临床相关性分析。通过在DU145细胞中敲低目的基因, 探究MSI1其对前列腺癌细胞DU145增殖、迁移和侵袭能力的影响, 组间比较采用独立样本t检验。结果 MSI1在前列腺癌中表达水平明显高于正常前列腺组织, 差异有统计学意义(7.75±1.01比4.56±0.54, t= 4.82, P<0.01)。且生存分析结果显示, 低表达MSI1组的无病生存期明显长于高表达组[风险比(HR):1.71(1.15~2.53), P<0.01]。T1+T2期MSI1表达水平和T3+T4期表达水平无统计学意义(t=0.38, P>0.05)。MSI表达水平[HR:1.47(1.02~2.10), P<0.05]、T分期[HR:1.93(1.02~3.60), P<0.05]及Gleason评分[HR:3.17(1.59~6.30), P<0.01]可作为前列腺癌的预后因素。细胞计数试剂盒(CCK-8)结果, 第4天Ctrl DU145细胞在波长450 nm吸光度(A)值为0.929±0.085, 而shMSI1#1和shMSI1#2 DU145实验组第4天A值分别为0.687±0.005和0.711±0.018, 与对照组比较差异有统计学意义(t=42.21、44.19, P<0.01)。DU145中ctrl组伤口愈合面积显著高于si-MSI1#1和si-MSI1#2组, 组间比较差异有统计学意义(P<0.01)。同时前列腺癌细胞迁移侵袭实验发现, ctrl组及si-MSI1#1和si-MSI1#2组PC3迁移细胞分别为790.9±80.7、403.3±49.9和504.6±117.3, 组间比较差异有统计学意义(t=21.80、13.55, P<0.01)。结论 MSI1在前列腺癌组织中高表达且与前列腺癌患者的不良预后明显相关。抑制MSI1可有效抑制前列腺癌细胞的增殖、侵袭能力。