Unknown,Transcriptomics,Genomics,Proteomics

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Examination of Ollier Disease and Maffucci Syndrome using IDH Tiling Array

ABSTRACT: Ollier disease and Maffucci syndrome are non-hereditary skeletal disorders characterized by multiple enchondromas (Ollier) combined with spindle cell hemangiomas (Maffucci). We found somatic heterozygous IDH1 mutations (R132C and R132H) in 83% of enchondromas, benign cartilage tumors, as well as in 40% of spindle cell hemangiomas, benign vascular lesions. In total, 33 of 42 (78%) patients with Ollier disease and 7 of 13 (54%) patients with Maffucci syndrome carried a mutation in at least one of their tumors. Twelve patients with multiple tumors at different locations displayed identical mutations in separate lesions. Immunohistochemical staining for the R132H IDH1 mutant protein suggested intraneoplastic as well as somatic mosaicism. IDH1 mutations were less frequent (63%) in high grade malignant cartilage tumors in Ollier disease, suggesting that IDH1 is less important for malignant transformation. IDH1 and IDH2 mutations were found in 36% of sporadic cartilage tumors and in four cell lines derived from sporadic chondrosarcomas. 16 samples were analyzed in two color experiment, using normal male or female as a reference sample (gender mismatched)

ORGANISM(S): Homo sapiens

SUBMITTER: Twinkal Pansuriya

PROVIDER: E-GEOD-30354 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Ollier disease and Maffucci syndrome are non-hereditary skeletal disorderscharacterized by multiple enchondromas (Ollier disease) combined with spindle cellhemangiomas (Maffucci syndrome). Somatic heterozygous IDH1 (R132C and R132H) orIDH2 (R172S) mutations were found in 87% of enchondromas, benign cartilage tumors,as well as in 70% of spindle cell hemangiomas, benign vascular lesions. In total, 35 of 43(81%) patients with Ollier disease and 10 of 13 (77%) patients with Maffucci syndromecarried IDH1 (98%) or rarely IDH2 (2%) mutations in their tumors. Fourteen patientswith multiple tumors at different anatomic locations displayed identical mutations inseparate lesions. Since in other tumor types the presence of an IDH1 mutation is strongly associated withhypermethylation 26, 27, we assessed whether there was a difference in methylation patternof enchondromas with (n = 8) and without (n = 4) IDH1 mutations detactable at Sangersequencing. Methylation and expressionprofiling showed that IDH1 mutations in cartilage tumors are associated withhypermethylation and downregulation of the expression of several genes. Total 12 samples which includes 8 enchondromas with IDH1 mutation (4 Ollier enchondromas, 2 Maffucci enchondromas and 2 solitary enchondromas) and 4 enchondromas (1 Ollier enchondroma, 3 solitary enchondromas) without IDH1 or IDH2 mutations were used. Of these 4 enchondromas without IDH1 mutation, one had R132G IDH1 mutated cells present in the subpopulation, below the threshold level of Sanger sequencing. Bisulfite treatment was performed using EZ DNA Methylation™ Kit (ZymoResearch, Orange, CA). Bisulphite converted DNA was then hybridized to IlluminaHumanMethylation27 BeadChip (Illumina Inc., San Diego, CA) by followingmanufacturer’s instructions. Infinium Unsupervised clustering analysis was performed 25 using the Ward’s clustering algorithm based on Euclidian distance. The 2000 most variable CpG sites (excluding those on the X and Y chromosomes) were used in the clustering analysis.

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Examination of Ollier Disease and Maffucci Syndrome using IDH Tiling Array

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