title: Microarray analysis reveals differential gene expression patterns in tumors of the pineal region.
abstract: Several types of tumors are known to originate from the pineal region, among them pineal parenchymal tumors (PPTs) and papillary tumors of the pineal region (PTPRs), probably derived from the subcommissural organ. As a result of their rarity, their histologic diagnosis remains difficult. To identify molecular markers, using CodeLink oligonucleotide arrays, gene expression was studied in 3 PPTs (2 pineocytomas and one pineoblastoma), 2 PTPRs, and one chordoid glioma, another rare tumor of the third ventricle. Because PTPR and chordoid glioma may present ependymal differentiation, gene expression was also analyzed in 4 ependymomas. The gene patterns of the 3 PPTs fell in the same cluster. The pineocytomas showed high expression of TPH, HIOMT, and genes related to phototransduction in the retina (OPN4, RGS16, and CRB3), whereas the pineoblastoma showed high expression of UBEC2, SOX4, TERT, TEP1, PRAME, CD24, POU4F2, and HOXD13. Using reverse transcriptase-polymerase chain reaction on 13 PPTs, we demonstrated that PRAME, CD24, POU4F2, and HOXD13 might be candidates for grading PPT with intermediate differentiation. PTPRs, classified with chordoid glioma and separately from ependymomas, showed high expression of SPEDF, KRT18, and genes encoding proteins reported to be expressed in the subcommissural organ, namely ZFH4, RFX3, TTR, and CGRP. Our results highlight the usefulness of gene expression profiling for classify tumors of the pineal region and identify genes with potential use as diagnostic markers.
authors.affiliation: University Claude-Bernard Lyon 1, Hôpital Neurologique, BP Lyon Montchat, Lyon, France. montange@lyon.inserm.fr
authors.forename: Michelle
authors.initials: M
authors.lastname: Fèvre-Montange
authors.forename: Jacques
authors.initials: J
authors.lastname: Champier
authors.forename: Alexandru
authors.initials: A
authors.lastname: Szathmari
authors.forename: Anne
authors.initials: A
authors.lastname: Wierinckx
authors.forename: Carmine
authors.initials: C
authors.lastname: Mottolese
authors.forename: Jacques
authors.initials: J
authors.lastname: Guyotat
authors.forename: Dominique
authors.initials: D
authors.lastname: Figarella-Branger
authors.forename: Anne
authors.initials: A
authors.lastname: Jouvet
authors.forename: Joël
authors.initials: J
authors.lastname: Lachuer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000235:genetics* / Q000378:metabolism; D001932:Brain Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D016000:Cluster Analysis; D005260:Female; D020869:Gene Expression Profiling / Q000706:statistics & numerical data*; D005786:Gene Expression Regulation; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D020411:Oligonucleotide Array Sequence Analysis; D010870:Pineal Gland / Q000473:pathology / Q000502:physiology; D010871:Pinealoma / Q000175:diagnosis / Q000235:genetics* / Q000378:metabolism / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor