Related Experiment Video
Updated: Apr 3, 2026

A Novel Method: Super-selective Adrenal Venous Sampling
Published on: September 15, 2017
Copy number variations alter methylation and parallel IGF2 overexpression in adrenal tumors
Helene Myrtue Nielsen1, Alexandre How-Kit2, Carole Guerin2
1Laboratory for Functional GenomicsFondation Jean Dausset - Centre d'Etude du Polymorphisme Humain (CEPH), Paris, FranceInstitute of BiomedicineAarhus University, Aarhus, DenmarkEndocrine and Metabolic Surgery DepartmentAP-HM La Conception, Marseille, FranceDepartment of EndocrinologyAP-HM La Timone, Marseille, FranceDepartment of GeneticsInstitute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, NorwayDivision of SurgeryTransplantation and Cancer Medicine, Department of Oncology, Oslo University Hospital, Oslo, NorwayThe K G Jebsen Center for Breast Cancer ResearchInstitute for Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, NorwayPathology DepartmentAP-HM La Timone, Marseille, FranceNuclear Endocrine Imaging and Treatment DepartmentAP-HM La Timone, Marseille, FranceCancer Research UKLondon Research Institute, London, UKDepartment of Human GeneticsUniversity of Leuven, Leuven, BelgiumGenotyping FacilitiesCentre National de Génotypage, CEA-Institut de Génomique, Evry, FranceDepartment of Clinical Molecular Biology (EpiGen)University of Oslo, Ahus, Lokerod, NorwayLaboratory of Molecular BiologyAP-HM La Conception and CRN2M, Aix-Marseille University, Marseille, FranceLaboratory for Epigenetics and EnvironmentCentre National de Génotypage, CEA-Institut de Génomique, Evry, France Laboratory for Functional GenomicsFondation Jean Dausset - Centre d'Etude du Polymorphisme Humain (CEPH), Paris, FranceInstitute of BiomedicineAarhus University, Aarhus, DenmarkEndocrine and Metabolic Surgery DepartmentAP-HM La Conception, Marseille, FranceDepartment of EndocrinologyAP-HM La Timone, Marseille, FranceDepartment of GeneticsInstitute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, NorwayDivision of SurgeryTransplantation and Cancer Medicine, Department of Oncology, Oslo University Hospital, Oslo, NorwayThe K G Jebsen Center for Breast Cancer ResearchInstitute for Clinical Medicine, Faculty
Abstract:
Overexpression of insulin growth factor 2 (IGF2) is a hallmark of adrenocortical carcinomas and pheochromocytomas. Previous studies investigating the IGF2/H19 locus have mainly focused on a single molecular level such as genomic alterations or altered DNA methylation levels and the causal changes underlying IGF2 overexpression are still not fully established. In the current study, we analyzed 62 tumors of the adrenal gland from patients with Conn's adenoma (CA, n=12), pheochromocytomas (PCC, n=10), adrenocortical benign tumors (ACBT, n=20), and adrenocortical carcinomas (ACC, n=20). Gene expression, somatic copy number variation of chr11p15.5, and DNA methylation status of three differential methylated regions of the IGF2/H19 locus including the H19 imprinting control region were integratively analyzed. IGF2 overexpression was found in 85% of the ACCs and 100% of the PCCs compared to 23% observed in CAs and ACBTs. Copy number aberrations of chr11p15.5 were abundant in both PCCs and ACCs but while PCCs retained a diploid state, ACCs were frequently tetraploid (7/19). Loss of either a single allele or loss of two alleles of the same parental origin in tetraploid samples resulted in a uniparental disomy-like genotype. These copy number changes correlated with hypermethylation of the H19 ICR suggesting that the lost alleles were the unmethylated maternal alleles. Our data provide conclusive evidence that loss of the maternal allele correlates with IGF2 overexpression in adrenal tumors and that hypermethylation of the H19 ICR is a consequence thereof.
Related Concept Videos
Genomic Imprinting and Inheritance
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Epigenetic Regulation
X-chromosome...
Epigenetic Regulation
Comparing Copy Number Variations and SNPs
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Adrenal Gland Disorders
Adrenal insufficiency, characterized by insufficient cortisol and aldosterone production, leads to conditions like Addison's disease. This disorder, affecting the adrenal cortex, exhibits symptoms such as skin bronzing, dehydration, low blood pressure, fatigue, and weight loss. Congenital adrenal hyperplasia, a genetic ailment causing...
Abnormal Proliferation

