title: Identification and functional analyses of 11,769 full-length human cDNAs focused on alternative splicing.
abstract: We analyzed diversity of mRNA produced as a result of alternative splicing in order to evaluate gene function. First, we predicted the number of human genes transcribed into protein-coding mRNAs by using the sequence information of full-length cDNAs and 5'-ESTs and obtained 23 241 of such human genes. Next, using these genes, we analyzed the mRNA diversity and consequently sequenced and identified 11 769 human full-length cDNAs whose predicted open reading frames were different from other known full-length cDNAs. Especially, 30% of the cDNAs we identified contained variation in the transcription start site (TSS). Our analysis, which particularly focused on multiple variable first exons (FEVs) formed due to the alternative utilization of TSSs, led to the identification of 261 FEVs expressed in the tissue-specific manner. Quantification of the expression profiles of 13 genes by real-time PCR analysis further confirmed the tissue-specific expression of FEVs, e.g. OXR1 had specific TSS in brain and tumor tissues, and so on. Finally, based on the results of our mRNA diversity analysis, we have created the FLJ Human cDNA Database. From our result, it has been understood mechanisms that one gene produces suitable protein-coding transcripts responding to the situation and the environment.
authors.affiliation: Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Ai
authors.initials: A
authors.lastname: Wakamatsu
authors.forename: Kouichi
authors.initials: K
authors.lastname: Kimura
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Yamamoto
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Nishikawa
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nomura
authors.forename: Sumio
authors.initials: S
authors.lastname: Sugano
authors.forename: Takao
authors.initials: T
authors.lastname: Isogai
mesh_terms: D017398:Alternative Splicing; D002874:Chromosome Mapping; D019295:Computational Biology / Q000379:methods; D018076:DNA, Complementary / Q000235:genetics* / Q000378:metabolism*; D030541:Databases, Genetic; D005091:Exons; D020224:Expressed Sequence Tags; D014644:Genetic Variation; D006801:Humans; D009928:Organ Specificity; D011506:Proteins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D013329:Structure-Activity Relationship; D024363:Transcription Initiation Site
chemical_list: D018076:DNA, Complementary; D011506:Proteins; D012333:RNA, Messenger