European urology · 2015
Balanced Translocations Disrupting SMARCB1 Are Hallmark Recurrent Genetic Alterations in Renal Medullary Carcinomas.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
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Calderaro Julien, Masliah-Planchon Julien, Richer Wilfrid, Maillot Laetitia, Maille Pascale, Mansuy Ludovic, Bastien Claire, de la Taille Alexandre, Boussion Hélène, Charpy Cécile, Jourdain Anne, Bléchet Claire, Pierron Gaelle, Gentien David, Choudat Laurence, Tournigand Christophe, Delattre Olivier, Allory Yves, Bourdeaut Franck
Аннотация
BACKGROUND: Renal medullary carcinoma (RMC) is a rare and highly aggressive neoplasm that most often occurs in the setting of sickle cell trait or sickle cell disease (SCD). Most patients present with metastatic disease resistant to conventional chemotherapy, and therefore there is an urgent need for molecular insight to propose new therapies.
OBJECTIVE: To determine the molecular alterations and oncogenic pathways that drive RMC development.
DESIGN, SETTING, AND PARTICIPANTS: A series of five frozen samples of patients with RMC was investigated by means of gene expression profiling, array comparative genomic hybridization, and RNA and whole exome sequencing (WES).
OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: RNA and DNA sequencing read data were analyzed to detect gene fusions and somatic mutations. Gene fusions mutations were validated by real-time polymerase chain reaction and fluorescence in situ hybridization. Gene expression profiling was analyzed by unsupervised hierarchical clustering and Gene Set Enrichment Analysis (Broad Institute, Cambridge, MA, USA).
RESULTS AND LIMITATIONS: We observed inactivation of the tumor suppressor gene SMARCB1 in all tumors. In all four cases developed in patients with SCD, we identified an original mechanism of interchromosomal balanced translocations that disrupt the SMARCB1 sequence and thus contribute to its inactivation. Gene expression profiling revealed that RMC shares common oncogenic pathways with pediatric malignant rhabdoid tumors, another tumor subtype characterized by SMARCB1 deficiency.
CONCLUSIONS: RMCs are characterized by an original mechanism of interchromosomal balanced translocations that disrupt the SMARCB1 sequence. WES reveals that RMCs show no other recurrent genetic alteration and an overall stable genome, underscoring the oncogenic potency of SMARCB1 inactivation.
PATIENT SUMMARY: Our comprehensive molecular study supports a pivotal role of the tumor suppressor gene SMARCB1 in the development of renal medullary carcinoma. The use of therapeutic strategies based on the biologic effects of its inactivation should now open new perspectives for this typically lethal malignancy.
OBJECTIVE: To determine the molecular alterations and oncogenic pathways that drive RMC development.
DESIGN, SETTING, AND PARTICIPANTS: A series of five frozen samples of patients with RMC was investigated by means of gene expression profiling, array comparative genomic hybridization, and RNA and whole exome sequencing (WES).
OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: RNA and DNA sequencing read data were analyzed to detect gene fusions and somatic mutations. Gene fusions mutations were validated by real-time polymerase chain reaction and fluorescence in situ hybridization. Gene expression profiling was analyzed by unsupervised hierarchical clustering and Gene Set Enrichment Analysis (Broad Institute, Cambridge, MA, USA).
RESULTS AND LIMITATIONS: We observed inactivation of the tumor suppressor gene SMARCB1 in all tumors. In all four cases developed in patients with SCD, we identified an original mechanism of interchromosomal balanced translocations that disrupt the SMARCB1 sequence and thus contribute to its inactivation. Gene expression profiling revealed that RMC shares common oncogenic pathways with pediatric malignant rhabdoid tumors, another tumor subtype characterized by SMARCB1 deficiency.
CONCLUSIONS: RMCs are characterized by an original mechanism of interchromosomal balanced translocations that disrupt the SMARCB1 sequence. WES reveals that RMCs show no other recurrent genetic alteration and an overall stable genome, underscoring the oncogenic potency of SMARCB1 inactivation.
PATIENT SUMMARY: Our comprehensive molecular study supports a pivotal role of the tumor suppressor gene SMARCB1 in the development of renal medullary carcinoma. The use of therapeutic strategies based on the biologic effects of its inactivation should now open new perspectives for this typically lethal malignancy.
Предметные рубрики MeSH
AdolescentAdultAnemia, Sickle CellCalpainCarcinogenesisCarcinomaChildComparative Genomic HybridizationDNA-Binding ProteinsGene Expression ProfilingGene FusionHumansKidney NeoplasmsNuclear ProteinsNuclear Receptor Subfamily 1, Group F, Member 1RNA, Long NoncodingSMARCB1 ProteinSequence Analysis, RNATrans-ActivatorsTranscription FactorsTranslocation, GeneticExome Sequencing