Identification of candidates for tumor-specific alternative splicing in the thyroid.
Alternative splicing is the differential processing of exon junctions to produce a new transcript variant from one gene. Some aberrant splicing, however, has been shown to be cancer specific. Identification of these specific splice variations will provide important insight into the molecular mechanism of normal cellular physiology as well as the disease processes. To gain knowledge about whether alternative splicing is linked to thyroid tumorigenesis, we used our prediction database to select targets for analysis. Fifteen putatively new alternative splicing isoforms were selected on the basis of their expression in thyroid libraries and/or their origin in genes previously associated with carcinogenesis. Using a set of 66 normal, benign, and malignant thyroid tissue samples, new splicing events were confirmed by RT-PCR for 13 of 15 genes (a validation rate of 87%). In addition, new alternative splicing isoforms not predicted by the system and not previously described in public databases were identified. Five genes (PTPN18, ABI3BP, PFDN5, SULF2, and ST5) presented new and/or additional unpredicted isoforms differentially expressed between malignant and benign or normal thyroid tissues, confirmed by sequencing. PTPN18, ABI3BP, and PFDN5 revealed a statistically significant differential splicing profile. In addition, real-time PCR analysis revealed that expression of an alternative PFDN5 variant was higher in malignant lesions than in benign lesions or normal tissues.
Laboratory of Molecular Endocrinology, Department of Medicine, Federal University of São Paulo, Brazil.
Gustavo S
GS
Guimarães
Flávia R M
FR
Latini
Cléber P
CP
Camacho
Rui M B
RM
Maciel
Emmanuel
E
Dias-Neto
Janete M
JM
Cerutti
D017398:Alternative Splicing; D003627:Data Interpretation, Statistical; D020224:Expressed Sequence Tags; D015723:Gene Library; D006801:Humans; D008957:Models, Genetic; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013961:Thyroid Gland / Q000166:cytology / Q000378:metabolism*; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000378:metabolism
D020033:Protein Isoforms