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Plant fertility defects induced by the enhanced expression of microRNA167

Cell Research 2006年第5期16卷 457-465页

作者： Peng Ru~1 Lin Xu~1 Hong Ma~(2,3) Hai Huang~(1,2) ~1National Laboratory of Plant Molecular Genetics,Shanghai institute of Plant Physiology and Ecology,Shanghai institute for Biological sciences,300 Fenglin Road,Shanghai 200032,China ~2SIBS-SJTU-PSU Joint Center for life sciences,Shanghai institute of Plant Physiology and Ecologgy,Shanghai institute for Biological sciences,300 Fenglin Road,Shanghai 200032,China ~3department of biology and the huck institute for the life sciences,the pennsylvania state university,university park,pa 16802,usa National Laboratory of Plant Molecular Genetics Shanghai Institute of Plant Physiology and Ecology Shanghai Institute for Biological Sciences Shanghai China SIBS-SJTU-PSU Joint Center for life sciences Shanghai Institute of Plant Physiology and Ecology Shanghai Institute for Biological Sciences Shanghai China department of biology and the huck institute for the life sciences The Pennsylvania State University University Park USA

The plant hormone auxin plays a critical role in regulating plant growth and *** advances havebeen made in the understanding of auxin response pathways,primarily by the characterization of auxin response mu-tants in *** addition,microRNAs (miRNAs) have been shown to be critical regulators of genes importantfor normal plant development and ***,little is known about possible interactions between miRNAsand hormonal signaling during norlnal *** we show that an Arabidopsis microRNA,miR167,whichhas a complementary sequence to a portion of the A UXIN RESPONSE FACTOR6 (ARF6) and ARF8 mRNAs,can causetranscript degradation for ARFS,but not for *** report phenotypic characterizations of35S::MIR167b transgeniclines,and show that severe 35S::MIR167b transgenic lines had phenotypes similar to those of an arf6 arf8 double *** transgenic phenotypes suggest that miR167 may repress ARF6 at the level of *** demonstrate that thetransgenic plants are defective in all four whorls of floral *** the transgenic flowers,filaments were abnormallyshort,anthers could not properly release pollen,and pollen grains did not *** results provide an importantlink between the miRNA-mediated regulatory pathway of gene expression and the auxin signaling network promotingplant reproductive development.

关键词： Arabidopsis auxin response factor microRNA167 floral organ pollen germination

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Double-stranded DNA breaks and gene functions in recombination and meiosis

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Cell Research 2006年第5期16卷 402-412页

作者： Wuxing Li~1 Hong Ma~1 ~1The department of biology,The Intercollege Graduate Degree Program in Plant Physiology,The huck institutes of the life sciences,the pennsylvania state university,university park,pa 16802,usa The department of biology The Intercollege Graduate Degree Program in Plant Physiology The Huck Institutes of the Life Sciences The Pennsylvania State University University Park USA

Meiotic prophase Ⅰ is a long and complex *** recombination is an important process that occursbetween homologous chromosomes during meiotic prophase Ⅰ.Formation of chiasmata,which hold homologous chro-mosomes together until the metaphase Ⅰ to anaphase Ⅰ transition,is critical for proper chromosome *** have suggested that the SPO 11 proteins have conserved functions in a number of organisms in generating sites ofdouble-stranded DNA breaks (DSBs) that are thought to be the starting points of homologous *** these sites of DSBs requires the function of RecA homologs,such as RAD51,DMC 1,and others,as suggested bymutant studies;thus *** to repair these meiotic DSBs results in abnormal chromosomal alternations,leading todisrupted *** discoveries on the functions of these RecA homologs have improved the understanding of themechanisms underlying meiotic homologous recombination.

关键词： meiosis homologous recombination double-stranded DNA breaks SPO11 RAD51 DMC1

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The Ray Wu Society for life sciences

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Chinese Science Bulletin 2003年第8期48卷 839-840页

作者： MA Hong department of biology and The huck institute for life sciences, the pennsylvania state university, 315 Wartik Laboratory, university park, pa 16802, usa (e-mail: Hxm16@psu.edu) Penn state Univ Dept Biol Wartik Lab 315 University Pk PA 16802 USA Penn state Univ Huck Inst Life Sci Wartik Lab 315 University Pk PA 16802 USA

The Ray Wu Society for life sciences (RWS) is a non-profit professional society of Chinese-American and Chinese life scientists with the goal to promote scientific communication among the scientists between usa and China and the life science research in China. The members of the RWS, now numbered more than 300, are a group of elite biologists who have reached the level of assistant professor or equivalent in their careers and are experts of their respective fields including molecular biology and genetics, cell and developmental biology, me- dicine, pharmacology, plant biology, and biotechnology. RWS was founded in early 1998 by a group of life scientists who have come from China during the last 22 years. With the encouragement of Dr. Chris Tan, the Director of the Molecular biology institute in Singapore, who proposed to set up a fund in the name of Prof. Ray Wu of Cornell university to recognize his contribution to the academic exchange between China and the usa. A quick positive response was reflected from American Chinese scholars with a further proposal of forming a professional society. This initiative spread rapidly and widely throughout the existing networks of Chinese life-science professionals.

关键词：生命科学中国美国学术交流科学研究

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How to build a functional gabaergic synapses?

How to build a functional gabaergic synapses?

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中国神经科学学会第四次会员代表大会暨第七届全国学术会议

作者： Gong CHEN department of biology,The huck institutes of life sciences,the pennsylvania state university,university park,pa 16802,usa

GABA is the predominant inhibitory neurotransmitter in the adult *** of GABAergic neurotransmission may be involved in serious neurological disorders,including epilepsy,anxiety,depression,and schizophrenia. Despite the vital function of GABA in the brain,the molecular mechanism of GABAergic synapse formation is still largely *** have employed primary neuronal cultures to study the presynaptic and postsynaptic differentiation during GABAergic *** found that GABAergic postsynaptic assembly is a very rapid process,much faster than its counterpart presynaptic assembly in cultured embryonic *** understand why it is so rapidly assembled,we used heterologous expression system HEK293 cells to study the essential molecular composition of GABAergic postsynaptic *** demonstrate that besides GABAA receptors,which is necessary to detect GABA transmitter,the only molecule needed is a cell adhesion molecule neuroligin-2 to build a fully functional GABAergic postsynaptic apparatus. Furthermore,the delta subunit-containing GABAA receptors,which are usually expressed in extrasynaptic membranes in neurons,are also excluded from the molecularly reconstituted GABAergic synapses formed on HEK293 ***,we have built an efficient system that will allow precise dissection of the molecular mechanisms of GABAergic synapse assembly.

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Receptor-like Kinase and Other Signaling Molecules in Controlling Early Anther Cell Division and Differentiation

Receptor-like Kinase and Other Signaling Molecules in Contro...

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2009整合植物生物学研讨会

作者： Hong Ma~* state Key Laboratory of Genetic Engineering and institute of Plant biology,Center for Evolutionary biology,School of life sciences,Fudan university,Shanghai 200433,China institutes of Biomedical sciences,Fudan university,Shanghai 200032,China department of biology and the huck institutes of the life sciences,the pennsylvania state university,university park,pa16802 usa.

Anther development is crucial for plant reproductive success and its understanding can contribute to better plant breeding *** early anther development,several somatic cell layers and meiocytes are formed by successive rounds of cell division and associated cell *** is clear that various cell types need to be coordinated,but

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Molecular genetic,cell biological and genomic analyses of meiotic recombination in Arabidopsis

Molecular genetic,cell biological and genomic analyses of me...

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从植物科学到农业发展——2012全国植物生物学大会

作者： Hong Ma state Key Laboratory of Genetic Engineering,institute of Plant biology,Center for Evolutionary biology,School of life sciences,Fudan university,Shanghai 2000433,China department of biology, the pennsylvania state university,university park,pa 16802 usa.

Meiotic recombination is crucial for normal meiotic homolog association and segregation, thereby ensuring normal fertility in plants and other *** addition,meiotic recombination redistributes genome variations and affects allelic frequencies each *** have identified and characterized several Arabidopsis genes important for meiotic recombination using molecular *** identify additional genes potentially important for meiotic recombination and other meiotic functions,we analyzed Arabidopsis male meiocyte transcriptome using high throughput sequencing of cDNAs and detected the expression of～16,000 *** found that,among 3,378 known Arabidopsis gene families,3,265 contained meiocyte-expressed genes and 18 were overrepresented in male *** addition,a large number of genes expressed in meiocytes are conserved in other organisms,including 503 single-copy genes shared between Arabidopsis,mouse and *** the genes detected in Arabidopsis meiocytes are those similar to genes for recombination or DNA synthesis,suggesting that they might be involved in meiotic recombination;genetic and cell biological studies of some of these genes reveal new mechanisms of meiotic recombination and support a key role for lagging strand DNA synthesis in crossover formation via the interference-sensitive *** highly conserved nature of these genes further suggests that the newly uncovered mechanisms might be widespread in eukaryotes.

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Use of highly conserved nuclear genes for molecular systematics:an illustration with RAD51 homologs and cohesins

Use of highly conserved nuclear genes for molecular systemat...

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生命之树国际学术研讨会

作者： Hong Ma Zhenguo Lin Xiaofan Zhou and Alexandra Surcel department of biology and the institute of Molecular Evolutionary Genetics The huck institutes of the life sciences The Integrative Bioscience Graduate Program the pennsylvania state university university park pa 16802 usa

＜正＞Understanding the evolutionary relationships between organisms is a cental objective of the Tree of life *** use of nuclear genes to invetisgate organismal relationships has been hampered by the wide-spread and frequent gene duplications found in many *** have found that genes controlling processes that are conserved among eukaryotes,even between prokaryotes and eukaryotes,tend to retain

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Analysis of the Transcriptional Networks for Arabidopsis Pollen Development

Analysis of the Transcriptional Networks for Arabidopsis Pol...

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中国植物生理学会第十次会员代表大会暨全国学术年会

作者： Hong Mastate Key Laboratory of Genetic Engineering and institute of Plant biology, Center for Evolutionary biology, School of life sciences, Fudan university, Shanghai, China 200433 institutes of Biomedical sciences, Fudan university, Shanghai, China 200032 department of biology and the huck institutes of the life sciences, the pennsylvania state university, university park, pa 16802

＜正＞Pollen development occurs in the male organ anther, which has both sporogenous （the germ-line） and somatic

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Phylogenetics and evolution of plant Su（var）3-9 SET genes in land plants:a diversity of structures and functions

Phylogenetics and evolution of plant Su（var）3-9 SET genes ...

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江苏省遗传学会第八届会员代表大会暨学术研讨会

作者： Xinyu Zhu~(1,2),Hongzhi Kong~1,Hong Ma~3,Zhiduan Chen~(*,1) 1 state Key Laboratory of Systematic and Evolutionary Botany,institute of Botany,Chinese Academy of sciences,Beijing 100093,China 2 School of life sciences,Nantong university,Nantong 226019,China 3 School of life sciences,Center for Evolutionary biology,Fudan university,Shanghai 200433,China and department of biology,the pennsylvania state university,university park pa 16802,usa

＜正＞Background:Plants contain numerous Su（var）3-9 homologues（SUVH） and related（SUVR） genes,some of which await functional *** there have been studies on the evolution of plant Su（var）3-9 SET genes,a systemat...

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New synthesis of amphiphilic copolymers PE-g-PEO via esterfication

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Chinese Science Bulletin 2003年第6期48卷 523-525页

作者： L?Yingying1, MA Zhi1,2, HU Youliang1, XU G. X.3 & CHUNG T. C.3 1. state Key Laboratory of Engineering Plastics, Center for Molecular Science, institute of Chemistry, Chinese Academy of sciences, Bei-jing Beijing Lab of Catalysis, Key Lab of Catalysis of China Na-tional Petroleum Corporation, Beijing 100080, China 2. Graduate School of Chinese Academy of sciences, Beijing 100039, China 3. department of Material Science and Engineering, pennsylvania state university, university park, pa 16802, usa state Key Laboratory of Engineering Plastics Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing Beijing Lab of Catalysis Key Lab of Catalysis of China National Petroleum Corporation Beijing China Graduate School of Chinese Academy of sciences Beijing China department of Material Science and Engineering Pennsylvania State University University Park USA

A new series of high molecular weight amphi-philic graft copolymers PE-g-PEO has been prepared. The esterifications between PE-p-MS-g-MA and PEO with OH group at the chain end are carried out under different condi-tions. The compositions of these graft copolymers are studied by NMR and FTIR. It is found to be a convenient and effi-cient way to prepare high molecular weight PE-g-PEO graft copolymers.

关键词：聚乙烯聚(乙烯氧化物) 酯化反应合成方法亲油亲水两性片断共聚物 PE-g-PEO

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