Distinction in gene expression profiles demonstrated in parathyroid adenomas by high-density oligoarray technology

Objectives: Somatic deletion of chromosome 11q13 is the most frequent genetic aberration in parathyroid adenoma. To gain further insight into the genetic etiology of parathyroid tumor development, we examined a comprehensive gene expression profile of parathyroid adenomas and normal parathyroid tissues. The results were then evaluated with respect to differences between adenomas and normal parathyroid tissue. and to the presence of loss of heterozygosity (LOH) in chromosomal region 11q13. Design and methods: Sporadic parathyroid adenomas and normal parathyroids were hybridized against HG-U95Av2 oligonucleotide arrays (Affymetrix) containing a total of 12 625 probe sets. Quantitative real-time PCR (QRT-PCR) was performed in a larger series of parathyroid adenomas, in order to confirm the microarray results. Results: Cyclin D1 and c-jun showed increased expression in adenomas vs normal parathyroids by microarray analysis and ORT-PCR. suggesting an oncogenic role of these genes in parathyroid turner development. At unsupervised hierarchical clustering, the adenomas fell into two groups: Group I adenomas were characterized by 11q13 LOH, while Group II adenomas lacked this abnormalitv In addition. a t-test analysis identified largely non-overlapping genes with differential expression in the tumors subgroups: e.g. in Group I tumors the putative oncogene ENC 1 was found highly overexpressed vs Group II adenomas. Conclusions: The microarray analyses revealed partly distinctive and partly common expression profiles in parathyroid adenomas with and without 11q13 LOH. In addition, approximately half of the under-expressed genes were mapped to chromosome 11, in agreement with a dose effect following loss of this chromosome.