Author
Yoshihiro Ugawa
Bio: Yoshihiro Ugawa is an academic researcher. The author has contributed to research in topics: Tree (data structure) & Expressed sequence tag. The author has an hindex of 1, co-authored 2 publications receiving 166 citations.
Papers
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TL;DR: Using size-fractionated subsets of cDNA from the first finger stage, two sets of gridded libraries were constructed for cDNA sequencing and the ESTs represent approximately 40% of genes expressed in late development, assuming that the non-redundant ESTs correspond to independent genes.
Abstract: In an effort to identify and characterize genes expressed during multicellular development in Dictyostelium, we have undertaken a cDNA sequencing project. Using size-fractionated subsets of cDNA from the first finger stage, two sets of gridded libraries were constructed for cDNA sequencing. One, li- brary S, consisting of 9984 clones, carries relatively short inserts, and the other, library L, which consists of 8448 clones, has longer inserts. We sequenced all the selected clones in library S from their 3'-ends, and this generated 3093 non-redundant, expressed sequence tags (ESTs). Among them, 246 ESTs hit known Dictyostelium genes and 910 showed significant similarity to genes of Dictyostelium and other or- ganisms. For library L, 1132 clones were randomly sequenced and 471 non-redundant ESTs were obtained. In combination, the ESTs from the two libraries represent approximately 40% of genes expressed in late development, assuming that the non-redundant ESTs correspond to independent genes. They will pro- vide a useful resource for investigating the genetic networks that regulate multicellular development of this
167 citations
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TL;DR: A new informatic approach is presented, which is capable of extracting evolutional information from a homology search result in the following way.
Abstract: As a result of progressing large-scale sequencing, a huge number of genes have been newly identi ed. Therefore, it became more important to predict function of these genes from its sequence. Generally, for this end, homology search by computational tools such as BLAST [1] and FASTA [2] is used as the most e ective method. However, if no homologous sequences are found, or if the functions of the homologous sequences are not well-characterized, no functional information can be derived from the result. In this report, we o er new informatic approach, which is capable of extracting evolutional information from such a result in the following way.
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TL;DR: The human paracaspase prodomain binds Bcl10, a protein involved in the t(1;14)(p22;q32) translocation of mucosa-associated lymphoid tissue (MALT) lymphoma, and it is found that this fusion activates NF-kappaB and that the caspase domain is required for this function, since mutation of the conserved catalytic cysteine attenuates NF- kappaB activation.
1,003 citations
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TL;DR: The results with these Sphk1 null mice reveal that some key physiologic processes that require S1P receptor signaling, such as vascular development and proper lymphocyte distribution, can occur in the absence of SPHK1.
434 citations
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TL;DR: It is shown that GFP-tagged TIP47 co-localizes with isolated intracellular lipid droplets and that related proteins from species as diverse as Drosophila and Dictyostelium can also target mammalian or Drosophile lipid droplet surfaces in vivo, strongly indicating that they have a common function for lipid deposition and/or mobilization.
351 citations
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TL;DR: This method depends on DNA fragment fusion by the PCR technique and requires only two steps of PCR to obtain a sufficient amount of the gene disruption construct for one transformation experiment, and is simple, rapid and relatively inexpensive.
Abstract: We introduce a PCR-based procedure for generating a gene disruption construct. This method depends on DNA fragment fusion by the PCR technique and requires only two steps of PCR to obtain a sufficient amount of the gene disruption construct for one transformation experiment. The first step involves three separate PCR syntheses of a selectable marker cassette and the 5'- and 3'-regions of a target gene. Of the four primers used in amplification of the 5'- and 3'-regions of the target gene, two primers placed proximal to the site of the marker cassette are designed to have sequence tags complementary to the 5'- or 3'-side of the marker cassette. The two primers used in PCR synthesis of the marker cassette are complementary to the tagged primers. By fusion PCR, the 5' and 3' PCR products are linked to the marker cassette via the regions of tagged primers that overlap. A sufficient amount of the disruption construct can be directly amplified with the outermost primers. This method is simple, rapid and relatively inexpensive. In addition, there is the freedom of attaching long flanking regions to any selectable marker cassette.
264 citations
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TL;DR: Results indicate that the Phg1 protein is involved in the adhesion of Dictyostelium to various substrates, a crucial event of phagocytosis and demonstrate the usefulness of a genetic approach to dissect the molecular events involved in that process.
203 citations