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   <title>RNA Bioinformatics</title>
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   <id>tag:www.rnabioinformatics.com,2007://6</id>
   <updated>2007-10-19T01:20:56Z</updated>
   
   <generator uri="http://www.sixapart.com/movabletype/">Movable Type 3.31</generator>

<entry>
   <title>Website of my lab</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/10/website_of_my_lab.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.341</id>
   
   <published>2007-10-19T01:20:11Z</published>
   <updated>2007-10-19T01:20:56Z</updated>
   
   <summary>The website of my lab at University of Iowa is up. Please click here....</summary>
   <author>
      <name></name>
      
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      <![CDATA[The website of my lab at University of Iowa is up. Please <a href="http://www.medicine.uiowa.edu/Labs/Xing/" target="__new">click here</a>.]]>
      
   </content>
</entry>
<entry>
   <title>Alternative splicing differences between humans and chimpanzees </title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/10/alternative_splicing_differenc.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.340</id>
   
   <published>2007-10-16T15:51:27Z</published>
   <updated>2007-10-16T15:53:46Z</updated>
   
   <summary>A new paper will come out on Genes and Development on Nov 15: Calarco, JA.*, Xing, Y.*, Caceres, M.*, Calarco, JP., Xiao, X., Pan, Q., Lee, C.,, Preuss, T. and Blencowe, B. (2007) Global analysis of alternative splicing differences between...</summary>
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      <name></name>
      
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      <![CDATA[A new paper will come out on <a href="http://www.genesdev.org/future/21.22.shtml" target="__new">Genes and Development on Nov 15</a>:

Calarco, JA.*, Xing, Y.*, Caceres, M.*, Calarco, JP., Xiao, X., Pan, Q., Lee, C.,, Preuss, T. and Blencowe, B. (2007) Global analysis of alternative splicing differences between humans and chimpanzees. Genes and Development. ]]>
      
   </content>
</entry>
<entry>
   <title>Efficient Genomic Interval Overlap Calculation</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/08/efficient_genomic_interval_ove.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.339</id>
   
   <published>2007-08-11T20:08:56Z</published>
   <updated>2007-08-11T20:11:15Z</updated>
   
   <summary>Found this python script for quick computation of overlapping features in genomic interval databases. The script can be downloaded from the author&apos;s FTP site indicated in this paper. It&apos;s a small script and very easy to use. It works with...</summary>
   <author>
      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[Found <a href="http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&dopt=Books&list_uids=17061921" target="__new">this python script</a> for quick computation of overlapping features in genomic interval databases. The script can be downloaded from the author's FTP site indicated in this paper. It's a small script and very easy to use. It works with standard GFF format.  ]]>
      
   </content>
</entry>
<entry>
   <title>Dr. Wing Wong&apos;s web seminar on Exon Array analysis</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/08/dr_wing_wongs_web_seminar_on_e.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.338</id>
   
   <published>2007-08-04T06:39:21Z</published>
   <updated>2007-08-04T19:36:37Z</updated>
   
   <summary>Dr. Wong will give a web seminar on August 9 for Exon Array analysis. PS: I am adding new features to the probe selection algorithm. We will allow users to initiate iterative probe selection from a pre-defined probe list. This...</summary>
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      <name></name>
      
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      <![CDATA[Dr. Wong will give a <a href="http://microarraybulletin.com/community/article.php?p=327" target="__new">web seminar</a> on August 9 for Exon Array analysis. 

PS: I am adding new features to the probe selection algorithm. We will allow users to initiate iterative probe selection from a pre-defined probe list. This could be probes that are selected from a high-quality and diverse exon array dataset, or probes that do not have cross-match to any other transcripts. We will provide such pre-defined probe lists from our GeneBASE website soon. ]]>
      
   </content>
</entry>
<entry>
   <title>new alternative splicing review</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/07/new_alternative_splicing_revie.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.337</id>
   
   <published>2007-07-29T07:02:06Z</published>
   <updated>2007-07-29T07:15:09Z</updated>
   
   <summary>Gelfand and colleagues wrote a comprehensive review concerning the evolution of alternative splicing. They covered lots of materials, explained some important subtleties in the published work, and presented different opinions in a balanced way. A pleasure to read....</summary>
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      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[Gelfand and colleagues wrote a comprehensive <a href="http://pubs.acs.org/cgi-bin/asap.cgi/chreay/asap/html/cr068304c.html" target="__new">review</a> concerning the evolution of alternative splicing. They covered lots of materials, explained some important subtleties in the published work,  and presented different opinions in a balanced way. A pleasure to read. ]]>
      
   </content>
</entry>
<entry>
   <title>bioinformatics postdoc positions available</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/07/postdoc_positions_available.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.336</id>
   
   <published>2007-07-15T18:58:37Z</published>
   <updated>2007-07-15T19:04:46Z</updated>
   
   <summary>I am setting up my lab in University of Iowa. I am looking for postdocs to work on RNA splicing and microRNA related projects. The successful candidates should have a proven record in genome sequence analysis or microarray analysis. Send...</summary>
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      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[I am setting up my lab in University of Iowa. I am looking for postdocs to work on RNA splicing and microRNA related projects. The successful candidates should have a proven record in genome sequence analysis or microarray analysis. <A HREF="mailto:yi-xing@uiowa.edu">Send  me an email</A> for details if you are interested. ]]>
      
   </content>
</entry>
<entry>
   <title>Alternative Splicing in the Postgenomic Era</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/07/alternative_splicing_in_the_po.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.335</id>
   
   <published>2007-07-15T10:09:51Z</published>
   <updated>2007-07-15T10:13:56Z</updated>
   
   <summary>Brenton Graveley and Ben Blencowe edited a book on alternative splicing - &quot;Alternative splicing in the postgenomic era&quot;. Click this link for a list of chapters. Chris and I contributed a chapter &quot;Relating Alternative Splicing to Proteome Complexity and Genome...</summary>
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      <name></name>
      
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      <![CDATA[Brenton Graveley and Ben Blencowe edited a book on alternative splicing - "Alternative splicing in the postgenomic era". Click <a href="http://www.eurekah.com/book/1045" target="__new">this link</a> for a list of chapters. Chris and I contributed a chapter "Relating Alternative Splicing to Proteome Complexity and Genome Evolution". This book is scheduled to come out in November. ]]>
      
   </content>
</entry>
<entry>
   <title>CSB2007 workshop on alternative splicing</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/06/csb2007_workshop_in_alternativ.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.334</id>
   
   <published>2007-06-13T08:18:35Z</published>
   <updated>2007-06-13T08:21:30Z</updated>
   
   <summary>A one-day workshop on alternative splicing during Computational Systems Biology (CSB) 2007. Details here....</summary>
   <author>
      <name></name>
      
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      <![CDATA[A one-day workshop on alternative splicing during Computational Systems Biology (CSB) 2007. Details <a href="http://csbl.bmb.uga.edu/CSB2007Workshop/" target="__new">here</a>.]]>
      
   </content>
</entry>
<entry>
   <title>GeneBASE </title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/05/genebase.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.333</id>
   
   <published>2007-05-25T07:29:17Z</published>
   <updated>2007-05-25T08:31:33Z</updated>
   
   <summary>Another Exon array paper is published! See Kapur, Xing, Ouyang and Wong, Genome Biology, 5:R82 The probe selection algorithm in the PLOS One 2006 paper is replaced by a more robust algorithm, which performs an initial cut of the clustering...</summary>
   <author>
      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[Another Exon array paper is published! See <a href="http://genomebiology.com/2007/8/5/R82/" target="__new">Kapur, Xing, Ouyang and Wong, Genome Biology, 5:R82</a>

The probe selection algorithm in the PLOS One 2006 paper is replaced by a more robust algorithm, which performs an initial cut of the clustering dendrogram, followed by iterative probe selection and fitting to the Li-Wong model. ]]>
      
   </content>
</entry>
<entry>
   <title>UMN-IMA RNA workshop</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/05/umnima_rna_workshop.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.332</id>
   
   <published>2007-05-25T05:18:55Z</published>
   <updated>2007-05-25T05:21:23Z</updated>
   
   <summary>RNA in Biology, Bioengineering and Nanotechnology, part of UMN-IMA&apos;s year-long program on Mathematics of Molecular and Cellular Biology....</summary>
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      <name></name>
      
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      <![CDATA[<a href="http://www.ima.umn.edu/2007-2008/W10.29-11.2.07/" target="__new">RNA in Biology, Bioengineering and Nanotechnology</a>, part of UMN-IMA's year-long program on Mathematics of Molecular and Cellular Biology. ]]>
      
   </content>
</entry>
<entry>
   <title>Affymetrix Gene Array</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/04/affymetrix_gene_array.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.331</id>
   
   <published>2007-04-08T00:51:23Z</published>
   <updated>2007-04-08T00:53:20Z</updated>
   
   <summary>a new expression array platform - Gene Array. It uses a subset of probes from Affymetrix Exon Arrays. Each gene has 26 probes on average....</summary>
   <author>
      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[a new expression array platform - <a href="http://www.affymetrix.com/products/arrays/specific/hugene_1_0_st/hugene_1_0_st.affx" target="__new">Gene Array</a>. It uses a subset of probes from Affymetrix Exon Arrays. Each gene has 26 probes on average. ]]>
      
   </content>
</entry>
<entry>
   <title>Studying the evolution of gene expression using Exon Arrays</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/03/studying_evolution_of_gene_exp.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.330</id>
   
   <published>2007-03-19T08:56:16Z</published>
   <updated>2007-03-26T08:06:18Z</updated>
   
   <summary>This is a simple study with interesting implications for evolutionary genomics and microarray analysis. Here is our paper and online supplemental material. Assessing the Conservation of Mammalian Gene Expression Using High-density Exon Arrays. Xing Y*, Ouyang Z, Kapur K, Scott...</summary>
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      <name></name>
      
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      <![CDATA[This is a simple study with interesting implications for evolutionary genomics and microarray analysis. Here is <a href="http://mbe.oxfordjournals.org/cgi/content/abstract/msm061v1" target="__new">our paper</a> and <a href="http://biogibbs.stanford.edu/~yxing/MBE/" target="__new">online supplemental material</a>. 

<strong>Assessing the Conservation of Mammalian Gene Expression Using High-density Exon Arrays. Xing Y*, Ouyang Z, Kapur K, Scott MP, Wong WH*. Molecular Biology and Evolution, 2007, In press. </strong>

Microarray data from multiple species have been used to study evolutionary constraints on gene expression.  Expression measurements from conventional microarray platforms such as the 3' expression arrays are strongly affected by platform-dependent probe effects that may introduce apparent, but misleading discrepancies between species. In this manuscript, we assess the conservation of mammalian gene expression in adult tissues using data from a high-density exon array platform. The exon arrays have more than six million probes on a single array targeting all exons in a genome.  We find that, unlike 3' array data, gene expression measurements from exon arrays reveal patterns of gene expression that are highly conserved between humans and mice in multiple tissues. Our analysis provides strong evidence for widespread stabilizing selection pressure on transcript abundance during mammalian evolution.
<img alt="Corr-Hs-Mm.jpg" src="http://www.rnabioinformatics.com/Corr-Hs-Mm.jpg" width="360" height="360" />]]>
      
   </content>
</entry>
<entry>
   <title>AS-SIG 2007 at ISMB</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/03/assig_2007_at_ismb.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.329</id>
   
   <published>2007-03-16T06:57:41Z</published>
   <updated>2007-03-16T06:59:27Z</updated>
   
   <summary>ISMB will continue to hold a 2day SIG meeting on alternative splicing in 2007....</summary>
   <author>
      <name></name>
      
   </author>
   
   
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      <![CDATA[ISMB will continue to hold a <a href="http://www.alternative-splicing.org/as-sig-07/index.html" target="__new">2day SIG meeting</a> on alternative splicing in 2007. ]]>
      
   </content>
</entry>
<entry>
   <title>Beyond Genome 2007 Alternative Splicing Symposium</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/03/beyond_genome_2007_alternative.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.328</id>
   
   <published>2007-03-14T07:29:36Z</published>
   <updated>2007-03-14T07:34:00Z</updated>
   
   <summary>Beyond Genome 2007 will have a 2-day symposium on alternative splicing. Click here for details. The list of speakers is excellent. Unfortunately I&apos;ll be in China for IBW2007 during the same week and cannot go to listen to these talks......</summary>
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      <name></name>
      
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   <content type="html" xml:lang="en" xml:base="http://www.rnabioinformatics.com/">
      <![CDATA[Beyond Genome 2007 will have a 2-day symposium on alternative splicing. Click <a href="http://www.beyondgenome.com/07SPL.asp" target="__new">here</a> for details. The list of speakers is excellent. Unfortunately I'll be in China for <a href="http://ibw2007.sdu.edu.cn/" target="__new">IBW2007</a> during the same week and cannot go to listen to these talks...]]>
      
   </content>
</entry>
<entry>
   <title>Cross-species microarray hybridization</title>
   <link rel="alternate" type="text/html" href="http://www.rnabioinformatics.com/2007/03/crossspecies_microarray_hybrid.html" />
   <id>tag:www.rnabioinformatics.com,2007://6.327</id>
   
   <published>2007-03-08T21:05:38Z</published>
   <updated>2007-03-14T07:29:27Z</updated>
   
   <summary>Lately, cross-species microarray hybridization has become a popular approach for gene expression profiling in less-annotated genomes, in particular for comparative genomics analyses of gene expression. The idea is to use a microarray platform designed for one species (e.g. humans) on...</summary>
   <author>
      <name></name>
      
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      <![CDATA[Lately, cross-species microarray hybridization has become a popular approach for gene expression profiling in less-annotated genomes, in particular for comparative genomics analyses of gene expression. The idea is to use a microarray platform designed for one species (e.g. humans) on a second (closely related) species (such as chimpanzees), for which a standard microarray platform is not available. 

There are a few nice reviews on this topic. Here is one from <a href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=17008090&itool=iconabstr&query_hl=6&itool=pubmed_DocSum" target="__new">Gilad et.al</a>; another one from <a href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=17313995&query_hl=2&itool=pubmed_docsum" target="__new">Bar-Or et.al</a>. 

A major issue with cross-species microarray hybridization is the effect of sequence divergence on probe affinity. It is common that a probe that perfectly matches its target in one species doesn't match the same region in the second species. Moreover, due to difference in sequence divergence rates, such effects are not uniform across all genes. For the moment, it's hard to correct for such effects during the analysis of microarray data. ]]>
      
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</entry>

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