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Novel somatic mutations in the VHL gene in Swedish archived sporadic renal cell carcinomas
1CNT, Department of Biosciences at Novum, Karolinska Institute, Huddinge, Sweden. ke.yang@cnt.ki.se
Abstract:
Frequent loss-of-function somatic mutations of the VHL gene have been detected in sporadic renal cell carcinoma (RCC), indicating that inactivation of the VHL gene plays a critical role in RCC. In this study, we collected 35 archived Swedish sporadic RCCs identified from an epidemiological study on occupational exposure and kidney cancer to test how well stored pathological specimens could be retrieved and analyzed for VHL mutations. Thirty specimens were successfully analyzed with PCR-SSCP and sequencing. Aberrant SSCP bands were detected in 16 out of the 30 samples (53%). Sequencing analysis of the aberrant bands revealed seven deletions, one insertion, one base substitution on a splicing site, six missense mutations, one silent mutation and several base substitutions in the 5' non-coding region and intron 1. Most were novel somatic mutations that have not been reported in sporadic RCC. The mutations were found in three types of non-papillary RCC cases, i.e. 14 clear cells, one granular chromophilic and one sarcomatoid RCC. Interesting multiple mutations were found in three cases (5, 3, 2 mutations, respectively).
Insights
Frequent VHL gene mutations are key in sporadic kidney cancer (RCC). This study analyzed archived RCC samples, finding over half had VHL gene mutations, many novel, highlighting VHL
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Loss-of-function somatic mutations in the VHL gene are frequently observed in sporadic renal cell carcinoma (RCC).
- VHL gene inactivation is considered a critical event in the development of RCC.
- Understanding the spectrum of VHL mutations in sporadic RCC is crucial for diagnosis and treatment.
Purpose of the Study:
- To assess the feasibility of retrieving and analyzing archived pathological specimens for VHL gene mutations in sporadic RCC.
- To identify and characterize VHL gene mutations in a cohort of Swedish sporadic RCC cases.
- To investigate the types and frequencies of VHL mutations in different subtypes of non-papillary RCC.
Main Methods:
- Collection and retrieval of 35 archived Swedish sporadic RCC pathological specimens.
- Analysis of VHL gene mutations using Polymerase Chain Reaction - Single Strand Conformation Polymorphism (PCR-SSCP).
- Sequencing of VHL gene regions with aberrant SSCP bands to identify specific mutations.
Main Results:
- VHL gene mutation analysis was successfully performed on 30 out of 35 (85.7%) archived RCC specimens.
- Aberrant VHL gene mutations were detected in 16 out of 30 analyzed samples (53.3%).
- Identified mutations included deletions, insertions, splicing site substitutions, missense mutations, silent mutations, and non-coding region alterations, with most being novel somatic mutations. Mutations were found in clear cell, granular chromophilic, and sarcomatoid RCC subtypes, with some cases exhibiting multiple mutations.
Conclusions:
- Archived pathological specimens are suitable for molecular analysis of VHL gene mutations in sporadic RCC.
- Over half of the analyzed sporadic RCC cases harbored VHL gene mutations, underscoring its importance in RCC pathogenesis.
- The study identified novel VHL mutations, expanding the known mutational landscape in sporadic RCC and suggesting potential roles in different RCC subtypes.