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  • 1
    Publication Date: 2014-01-16
    Description: Motivation: RNA-seq technology has been widely adopted as an attractive alternative to microarray-based methods to study global gene expression. However, robust statistical tools to analyze these complex datasets are still lacking. By grouping genes with similar expression profiles across treatments, cluster analysis provides insight into gene functions and networks, and hence is an important technique for RNA-seq data analysis. Results: In this manuscript, we derive clustering algorithms based on appropriate probability models for RNA-seq data. An expectation-maximization algorithm and another two stochastic versions of expectation-maximization algorithms are described. In addition, a strategy for initialization based on likelihood is proposed to improve the clustering algorithms. Moreover, we present a model-based hybrid-hierarchical clustering method to generate a tree structure that allows visualization of relationships among clusters as well as flexibility of choosing the number of clusters. Results from both simulation studies and analysis of a maize RNA-seq dataset show that our proposed methods provide better clustering results than alternative methods such as the K-means algorithm and hierarchical clustering methods that are not based on probability models. Availability and implementation: An R package, MBCluster.Seq, has been developed to implement our proposed algorithms. This R package provides fast computation and is publicly available at http://www.r-project.org . Contact: sy@swufe.edu.cn ; pliu@iastate.edu Supplementary Information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 2
    Publication Date: 2008-01-19
    Description: Dietary vitamin A deficiency causes eye disease in 40 million children each year and places 140 to 250 million at risk for health disorders. Many children in sub-Saharan Africa subsist on maize-based diets. Maize displays considerable natural variation for carotenoid composition, including vitamin A precursors alpha-carotene, beta-carotene, and beta-cryptoxanthin. Through association analysis, linkage mapping, expression analysis, and mutagenesis, we show that variation at the lycopene epsilon cyclase (lcyE) locus alters flux down alpha-carotene versus beta-carotene branches of the carotenoid pathway. Four natural lcyE polymorphisms explained 58% of the variation in these two branches and a threefold difference in provitamin A compounds. Selection of favorable lcyE alleles with inexpensive molecular markers will now enable developing-country breeders to more effectively produce maize grain with higher provitamin A levels.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2933658/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2933658/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harjes, Carlos E -- Rocheford, Torbert R -- Bai, Ling -- Brutnell, Thomas P -- Kandianis, Catherine Bermudez -- Sowinski, Stephen G -- Stapleton, Ann E -- Vallabhaneni, Ratnakar -- Williams, Mark -- Wurtzel, Eleanore T -- Yan, Jianbing -- Buckler, Edward S -- S06-GM08225/GM/NIGMS NIH HHS/ -- SC1 GM081160/GM/NIGMS NIH HHS/ -- SC1 GM081160-01/GM/NIGMS NIH HHS/ -- SC1 GM081160-02/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2008 Jan 18;319(5861):330-3. doi: 10.1126/science.1150255.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Genomic Diversity, Cornell University, Ithaca, NY 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18202289" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Breeding ; Carotenoids/*analysis/metabolism ; Crosses, Genetic ; Cryptoxanthins ; Gene Expression Regulation, Plant ; *Genetic Variation ; Haplotypes ; Intramolecular Lyases/*genetics/metabolism ; Molecular Sequence Data ; Mutagenesis ; Nutritive Value ; Polymorphism, Genetic ; Quantitative Trait Loci ; Xanthophylls/analysis/metabolism ; Zea mays/chemistry/enzymology/*genetics ; beta Carotene/analysis/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2009-12-08
    Description: We report an improved draft nucleotide sequence of the 2.3-gigabase genome of maize, an important crop plant and model for biological research. Over 32,000 genes were predicted, of which 99.8% were placed on reference chromosomes. Nearly 85% of the genome is composed of hundreds of families of transposable elements, dispersed nonuniformly across the genome. These were responsible for the capture and amplification of numerous gene fragments and affect the composition, sizes, and positions of centromeres. We also report on the correlation of methylation-poor regions with Mu transposon insertions and recombination, and copy number variants with insertions and/or deletions, as well as how uneven gene losses between duplicated regions were involved in returning an ancient allotetraploid to a genetically diploid state. These analyses inform and set the stage for further investigations to improve our understanding of the domestication and agricultural improvements of maize.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schnable, Patrick S -- Ware, Doreen -- Fulton, Robert S -- Stein, Joshua C -- Wei, Fusheng -- Pasternak, Shiran -- Liang, Chengzhi -- Zhang, Jianwei -- Fulton, Lucinda -- Graves, Tina A -- Minx, Patrick -- Reily, Amy Denise -- Courtney, Laura -- Kruchowski, Scott S -- Tomlinson, Chad -- Strong, Cindy -- Delehaunty, Kim -- Fronick, Catrina -- Courtney, Bill -- Rock, Susan M -- Belter, Eddie -- Du, Feiyu -- Kim, Kyung -- Abbott, Rachel M -- Cotton, Marc -- Levy, Andy -- Marchetto, Pamela -- Ochoa, Kerri -- Jackson, Stephanie M -- Gillam, Barbara -- Chen, Weizu -- Yan, Le -- Higginbotham, Jamey -- Cardenas, Marco -- Waligorski, Jason -- Applebaum, Elizabeth -- Phelps, Lindsey -- Falcone, Jason -- Kanchi, Krishna -- Thane, Thynn -- Scimone, Adam -- Thane, Nay -- Henke, Jessica -- Wang, Tom -- Ruppert, Jessica -- Shah, Neha -- Rotter, Kelsi -- Hodges, Jennifer -- Ingenthron, Elizabeth -- Cordes, Matt -- Kohlberg, Sara -- Sgro, Jennifer -- Delgado, Brandon -- Mead, Kelly -- Chinwalla, Asif -- Leonard, Shawn -- Crouse, Kevin -- Collura, Kristi -- Kudrna, Dave -- Currie, Jennifer -- He, Ruifeng -- Angelova, Angelina -- Rajasekar, Shanmugam -- Mueller, Teri -- Lomeli, Rene -- Scara, Gabriel -- Ko, Ara -- Delaney, Krista -- Wissotski, Marina -- Lopez, Georgina -- Campos, David -- Braidotti, Michele -- Ashley, Elizabeth -- Golser, Wolfgang -- Kim, HyeRan -- Lee, Seunghee -- Lin, Jinke -- Dujmic, Zeljko -- Kim, Woojin -- Talag, Jayson -- Zuccolo, Andrea -- Fan, Chuanzhu -- Sebastian, Aswathy -- Kramer, Melissa -- Spiegel, Lori -- Nascimento, Lidia -- Zutavern, Theresa -- Miller, Beth -- Ambroise, Claude -- Muller, Stephanie -- Spooner, Will -- Narechania, Apurva -- Ren, Liya -- Wei, Sharon -- Kumari, Sunita -- Faga, Ben -- Levy, Michael J -- McMahan, Linda -- Van Buren, Peter -- Vaughn, Matthew W -- Ying, Kai -- Yeh, Cheng-Ting -- Emrich, Scott J -- Jia, Yi -- Kalyanaraman, Ananth -- Hsia, An-Ping -- Barbazuk, W Brad -- Baucom, Regina S -- Brutnell, Thomas P -- Carpita, Nicholas C -- Chaparro, Cristian -- Chia, Jer-Ming -- Deragon, Jean-Marc -- Estill, James C -- Fu, Yan -- Jeddeloh, Jeffrey A -- Han, Yujun -- Lee, Hyeran -- Li, Pinghua -- Lisch, Damon R -- Liu, Sanzhen -- Liu, Zhijie -- Nagel, Dawn Holligan -- McCann, Maureen C -- SanMiguel, Phillip -- Myers, Alan M -- Nettleton, Dan -- Nguyen, John -- Penning, Bryan W -- Ponnala, Lalit -- Schneider, Kevin L -- Schwartz, David C -- Sharma, Anupma -- Soderlund, Carol -- Springer, Nathan M -- Sun, Qi -- Wang, Hao -- Waterman, Michael -- Westerman, Richard -- Wolfgruber, Thomas K -- Yang, Lixing -- Yu, Yeisoo -- Zhang, Lifang -- Zhou, Shiguo -- Zhu, Qihui -- Bennetzen, Jeffrey L -- Dawe, R Kelly -- Jiang, Jiming -- Jiang, Ning -- Presting, Gernot G -- Wessler, Susan R -- Aluru, Srinivas -- Martienssen, Robert A -- Clifton, Sandra W -- McCombie, W Richard -- Wing, Rod A -- Wilson, Richard K -- New York, N.Y. -- Science. 2009 Nov 20;326(5956):1112-5. doi: 10.1126/science.1178534.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Plant Genomics, Iowa State University, Ames, IA 50011, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19965430" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Centromere/genetics ; Chromosome Mapping ; Chromosomes, Plant/genetics ; Crops, Agricultural/genetics ; DNA Copy Number Variations ; DNA Methylation ; DNA Transposable Elements ; DNA, Plant/genetics ; Genes, Plant ; *Genetic Variation ; *Genome, Plant ; Inbreeding ; MicroRNAs/genetics ; Molecular Sequence Data ; Ploidies ; RNA, Plant/genetics ; Recombination, Genetic ; Retroelements ; *Sequence Analysis, DNA ; Zea mays/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2016-08-03
    Description: Many important crops are members of the Poaceae family, which develop root systems characterized by a high degree of root initiation from the belowground basal nodes of the shoot, termed the crown. Although this postembryonic shoot-borne root system represents the major conduit for water uptake, little is known about the...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 5
  • 6
    Publication Date: 2013-02-12
    Description: We report the first study on the genetic control of flowering in Setaria, a panicoid grass closely related to switchgrass, and in the same subfamily as maize and sorghum. A recombinant inbred line mapping population derived from a cross between domesticated Setaria italica (foxtail millet) and its wild relative Setaria viridis (green millet), was grown in eight trials with varying environmental conditions to identify a small number of quantitative trait loci (QTL) that control differences in flowering time. Many of the QTL across trials colocalize, suggesting that the genetic control of flowering in Setaria is robust across a range of photoperiod and other environmental factors. A detailed comparison of QTL for flowering in Setaria, sorghum, and maize indicates that several of the major QTL regions identified in maize and sorghum are syntenic orthologs with Setaria QTL, although the maize large effect QTL on chromosome 10 is not. Several Setaria QTL intervals had multiple LOD peaks and were composed of multiple syntenic blocks, suggesting that observed QTL represent multiple tightly linked loci. Candidate genes from flowering time pathways identified in rice and Arabidopsis were identified in Setaria QTL intervals, including those involved in the CONSTANS photoperiod pathway. However, only three of the approximately seven genes cloned for flowering time in maize colocalized with Setaria QTL. This suggests that variation in flowering time in separate grass lineages is controlled by a combination of conserved and lineage specific genes.
    Electronic ISSN: 2160-1836
    Topics: Biology
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  • 7
    Publication Date: 2011-08-18
    Description: The shape of a plant is largely determined by regulation of lateral branching. Branching architecture can vary widely in response to both genotype and environment, suggesting regulation by a complex interaction of autonomous genetic factors and external signals. Tillers, branches initiated at the base of grass plants, are suppressed in response to shade conditions. This suppression of tiller and lateral branch growth is an important trait selected by early agriculturalists during maize domestication and crop improvement. To understand how plants integrate external environmental cues with endogenous signals to control their architecture, we have begun a functional characterization of the maize mutant grassy tillers1 (gt1). We isolated the gt1 gene using positional cloning and found that it encodes a class I homeodomain leucine zipper gene that promotes lateral bud dormancy and suppresses elongation of lateral ear branches. The gt1 expression is induced by shading and is dependent on the activity of teosinte branched1 (tb1), a major domestication locus controlling tillering and lateral branching. Interestingly, like tb1, gt1 maps to a quantitative trait locus that regulates tillering and lateral branching in maize and shows evidence of selection during maize domestication. Branching and shade avoidance are both of critical agronomic importance, but little is known about how these processes are integrated. Our results indicate that gt1 mediates the reduced branching associated with the shade avoidance response in the grasses. Furthermore, selection at the gt1 locus suggests that it was involved in improving plant architecture during the domestication of maize.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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