Reis EM, Ojopi EPB, Alberto FL, Rahal P, Tsukumo F, Mancini UM, Guimarães GS, Thompson GMA, Camacho C, Miracca E, Carvalho AL, Machado AA, Paquola ACM, Cerutti JM, da Silva AM, Pereira GG, Valentini SR, Nagai MA, Kowalski LP, Verjovski-Almeida S, Tajara EH, Dias-Neto E, Bengtson MH, Canevari RA, Carazzolle MF, Colin C, Costa FF, Costa MCR, Estécio MRH, Esteves LICV, Federico MHH, Guimarães PEM, Hackel C, Kimura ET, Leoni SG, Maciel RMB, Maistro S, Mangone FRR, Massirer KB, Matsuo SE, Nobrega FG, Nóbrega MP, Nunes DN, Nunes F, Pandolfi JR, Pardini MIMC, Pasini FS, Peres T, Rainho CA, dos Reis PP, Rodrigus-Lisoni FCC, Rogatto SR, dos Santos A, dos Santos PCC, Sogayar MC, Zanelli CF. Large-scale Transcriptome Analyses Reveal New Genetic Marker Candidates of Head, Neck, and Thyroid Cancer.
Cancer Res 2005;
65:1693-9. [PMID:
15753364 DOI:
10.1158/0008-5472.can-04-3506]
[Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A detailed genome mapping analysis of 213,636 expressed sequence tags (EST) derived from nontumor and tumor tissues of the oral cavity, larynx, pharynx, and thyroid was done. Transcripts matching known human genes were identified; potential new splice variants were flagged and subjected to manual curation, pointing to 788 putatively new alternative splicing isoforms, the majority (75%) being insertion events. A subset of 34 new splicing isoforms (5% of 788 events) was selected and 23 (68%) were confirmed by reverse transcription-PCR and DNA sequencing. Putative new genes were revealed, including six transcripts mapped to well-studied chromosomes such as 22, as well as transcripts that mapped to 253 intergenic regions. In addition, 2,251 noncoding intronic RNAs, eventually involved in transcriptional regulation, were found. A set of 250 candidate markers for loss of heterozygosis or gene amplification was selected by identifying transcripts that mapped to genomic regions previously known to be frequently amplified or deleted in head, neck, and thyroid tumors. Three of these markers were evaluated by quantitative reverse transcription-PCR in an independent set of individual samples. Along with detailed clinical data about tumor origin, the information reported here is now publicly available on a dedicated Web site as a resource for further biological investigation. This first in silico reconstruction of the head, neck, and thyroid transcriptomes points to a wealth of new candidate markers that can be used for future studies on the molecular basis of these tumors. Similar analysis is warranted for a number of other tumors for which large EST data sets are available.
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