title: In silico search for natural antisense transcripts reveals their differential expression in human tumors.
abstract: We created an algorithm that allows high-throughput mapping of sense-antisense (SA) pairs of transcripts. By this method we mapped approximately 32 000 SA pairs of human mRNAs. Collected SA pairs were divided into three groups: SA pairs based on two or more UniGene clusters (17% of all sense-antisense pairs), SA pairs based on ESTs that belong to the same UniGene cluster (42%), and SA pairs formed by UniGene cluster and non-unique unclustered transcripts (41%). To study expression patterns of natural SA pairs we created a software application "Antisense Cluster Filter". We retrieved tissue expression data for all the transcripts forming identified SA pairs, including clustered and unclustered ones. After that, we selected 108 SA pairs represented by transcripts differentially regulated in human tumors. For each of these SA pairs one of the transcripts was expressed only in tumors, another one was expressed both in non-malignant and malignant tissues. Indicated SA pairs may represent a new class of tumor markers. An example of the tumor-specific natural antisense to C3orf4 mRNA is detailed.
authors.affiliation: Institute of General Genetics RAS, Moscow, 119991, Russia, Gubkin Str. 3, Russia. dklimov@vigg.ru
authors.forename: Dmitry
authors.initials: D
authors.lastname: Klimov
authors.forename: Mikhail
authors.initials: M
authors.lastname: Skoblov
authors.forename: Andrei
authors.initials: A
authors.lastname: Ryazantzev
authors.forename: Tatiana
authors.initials: T
authors.lastname: Tyazhelova
authors.forename: Ancha
authors.initials: A
authors.lastname: Baranova
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics*; D002874:Chromosome Mapping / Q000379:methods*; D016373:DNA, Antisense / Q000235:genetics*; D004273:DNA, Neoplasm / Q000235:genetics*; D030541:Databases, Genetic; D020224:Expressed Sequence Tags; D015870:Gene Expression / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics*; D009369:Neoplasms / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D014408:Biomarkers, Tumor; D016373:DNA, Antisense; D004273:DNA, Neoplasm; D009363:Neoplasm Proteins; D014157:Transcription Factors