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http://dx.doi.org/10.5352/JLS.2004.14.6.1009

Genomic Structure Analyses of Five Kinds of Human Sialyltransferase Gene  

Kang Nam-Young (Faculty of Biotechnology, College of Natural Resources and Life Science, Dong-A University)
Kim Sang-Wan (Faculty of Biotechnology, College of Natural Resources and Life Science, Dong-A University)
Kim Cheorl-Ho (Department of Biochemistry and Molecular Biology, College of Oriental Medicine, Dongguk University)
Lee Young-Choon (Faculty of Biotechnology, College of Natural Resources and Life Science, Dong-A University)
Publication Information
Journal of Life Science / v.14, no.6, 2004 , pp. 1009-1017 More about this Journal
Abstract
Sialyltransferases cloned so far show the remarkable tissue-specific expression, which is correlated with the existence of cell type-specific sialylated sugar structure in glycoconjugates. In the previous studies, we found various mRNA isoforms of human sialyltransferases generated by alternative splicing and alternative promoter utilization. To understand the regulatory mechanisms for specific expression of human sialyltransferase genes and for production of their mRNA isoforms, in this study, we have isolated and characterized five kinds of human sialyltransferase genes: hST3Gal II, hST8Sia II, hST8Sia III, hST8Sia IV, and hST8Sia V. The hST3Gal II gene is composed of six exons, which span over 17kb, with exons ranging in size from 46 to over 1017 bp. The hST8Sia III gene comprises over 10 kb, and consists of only four exons, which is much smaller and simpler than other human sialyltransferase genes. In contrast, three genes (hST8Sia II, hST8Sia IV and hST8Sia V) span more than 70 kb, and comprise five or more exons. All exon-intron boundaries follow the GT-AG rule. In particular, the sialylmotif L, which is a highly conserved region in all cloned sialyltransferases, was found in one exon of hST8Sia III, whereas this motif is encoded by discrete exons in the other human sialyltransferases. Exon structures of these sialyltransferase genes show the structural diversity, as found in other human sialyltransferase genes reported so far. We determined the transcription start site of hST3Gal II gene by the 5'-RACE and cap site hunting experiments.
Keywords
Sialyltransferase; Genomic organization; Exon structure; Transcription start site;
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