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The DNA methylome of benign and malignant parathyroid tumors
Author(s) -
Starker Lee F.,
Svedlund Jessica,
Udelsman Robert,
Dralle Henning,
Åkerström Göran,
Westin Gunnar,
Lifton Richard P.,
Björklund Peyman,
Carling Tobias
Publication year - 2011
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/gcc.20895
Subject(s) - dna methylation , parathyroid carcinoma , cpg site , methylation , carcinogenesis , biology , cancer research , parathyroid hormone , epigenetics , gene , pathology , gene expression , primary hyperparathyroidism , medicine , genetics , endocrinology , calcium
Abstract The role of DNA methylation of CpG islands in parathyroid tumorigenesis has not been analyzed in an unbiased, systematic fashion. DNA was isolated from normal and pathologic parathyroid tissues, bisulphite modified and analyzed using the Infinium HumanMethylation27 BeadChip. Distinct hierarchical clustering of genes with altered DNA methylation profiles in normal and pathologic parathyroid tissue was evident. Comparing normal parathyroid tissue with parathyroid adenomas, 367 genes were significantly altered, while 175 genes significantly differed when comparing parathyroid carcinomas and normal parathyroid tissues. A comparison between parathyroid adenomas and parathyroid carcinomas identified 263 genes with significantly distinct methylation levels. Results were confirmed for certain genes in a validation cohort of 40 parathyroid adenomas by methylation‐specific PCR. Genes of known or putative importance in the development of parathyroid tumors showed significant and frequent hypermethylation. DNA hypermethylation of CDKN2B , CDKN2A , WT1 , SFRP1 , SFRP2 , and SFRP4 was associated with reduced gene expression in both benign and malignant parathyroid tumors. Treatment with 5‐aza‐2′‐deoxycytidine of primary cell cultures restores expression of hypermethylated genes in benign and malignant parathyroid tumors. In conclusion, the unbiased, genome‐wide study of the parathyroid tumor DNA methylome identified a number of genes with altered DNA methylation patterns of putative importance to benign and malignant parathyroid tumorigenesis. © 2011 Wiley‐Liss, Inc.