Genomic profiling of the genes on chromosome 3p in sporadic clear cell renal cell carcinoma

International Journal of Oncology
Yoshikazu TogoTomoko Hashimoto-Tamaoki

Abstract

Somatic mutations of the BRCA1 associated protein-1 (BAP1) gene, which maps to 3p21, have been found in several tumors including malignant mesothelioma, uveal melanoma, and renal cell carcinoma (RCC). The role of BAP1 inactivation in tumor development remains unclear. It has been reported that Vhl knock-out mice did not develop RCC, but Vhl knock-out mice with single allele loss of Bap1 in nephron progenitor cells developed RCC, indicating that Bap1 inactivation may be essential in murine renal tumorigenesis. To clarify the role of BAP1 in human RCC development, we performed mutation analyses, including copy number detection of BAP1 and assessment of allelic imbalance using microsatellite polymorphisms on 3p, in 45 RCC samples derived from 45 patients without VHL or BAP1 germline mutation. Additionally, we analyzed the sequences of the VHL, PBRM1, and SETD2 genes, and examined promoter methylation of VHL. Using immunostaining, we also checked for expression of BAP1 protein, which is normally located in the nuclei. None of the RCCs had biallelic deletion of BAP1, but five (11.1%) showed a biallelic mutation (four with a sequence-level mutation with monoallelic loss and one with a biallelic sequence-level mutation); these cells w...Continue Reading

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