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Insulin-like growth factor 2 gene imprinting in clear cell sarcoma of the kidney
T Sohda1, H Soejima, T Matsumoto
1Department of Pathology, University of Otago Medical School, Dunedin, New Zealand.
Abstract:
We examined the expression of insulin-like growth factor 2 (IGF2) transcripts and allelic-specificity in four cases of clear cell sarcoma of the kidney (CCSK). All cases contained abundant IGF2 transcripts in the cytoplasm of tumor cells detected by in situ mRNA hybridization. The level of IGF2 expression was comparable with that of Wilms tumor. The IGF2 gene imprinting status was analysed by using DNA/RNA extracted from one frozen tumor tissue and three archival tumor and kidney tissue. The allele-specific analysis using Apa1 polymorphism in the 5'-untranslated region of the IGF2 gene showed that two out of four tumors were heterozygous at the IGF2 locus. The result showed that one of two informative heterozygous tumors showed biallelic IGF2 expression whereas the other showed monoallelic expression. The data show that disruption of IGF2 gene imprinting occurs in CCSK.
Insights
This study investigated insulin-like growth factor 2 (IGF2) in clear cell sarcoma of the kidney (CCSK). Results indicate that IGF2 gene imprinting is disrupted in CCSK, a crucial finding for understanding this rare cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Clear cell sarcoma of the kidney (CCSK) is a rare pediatric malignancy.
- Insulin-like growth factor 2 (IGF2) is an important growth factor implicated in various cancers.
- IGF2 gene imprinting, a process of allele-specific gene expression, is critical for normal development and can be dysregulated in cancer.
Purpose of the Study:
- To examine the expression of insulin-like growth factor 2 (IGF2) transcripts in CCSK.
- To investigate the allelic-specificity and imprinting status of the IGF2 gene in CCSK tumors.
Main Methods:
- In situ mRNA hybridization was used to detect IGF2 transcripts in tumor cells.
- DNA and RNA were extracted from tumor tissues for genetic analysis.
- Allele-specific expression analysis was performed using Apa1 polymorphism in the 5'-untranslated region of the IGF2 gene.
Main Results:
- Abundant IGF2 transcripts were detected in the cytoplasm of CCSK tumor cells, with expression levels comparable to Wilms tumor.
- Two out of four CCSK tumors analyzed were heterozygous at the IGF2 locus.
- One heterozygous tumor exhibited biallelic IGF2 expression, while the other showed monoallelic expression, indicating imprinting disruption.
Conclusions:
- Disruption of IGF2 gene imprinting occurs in clear cell sarcoma of the kidney.
- These findings suggest that dysregulation of IGF2 imprinting may play a role in the pathogenesis of CCSK.
- Further research into IGF2 pathway alterations in CCSK is warranted.