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  • Original Paper
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Allelic imbalance of APAF-1 locus at 12q23 is related to progression of colorectal carcinoma

Abstract

APAF-1 gene, located at chromosome locus 12q23, is a key factor in the mitochondrial apoptotic pathway downstream of p53, and is a potential tumor suppressor gene. We hypothesized that APAF-1 gene dysfunction due to allelic imbalance (AI) contributes to the development and progression of colorectal carcinoma (CRC). AI at APAF-1 locus and microsatellite instability (MIN) in CRCs and adenomas were assessed by multiple microsatellite markers. The frequency of AI significantly increased with tumor progression; 0 of 33 (0%) adenomas, 14 of 49 (29%) primary CRCs, and 18 of 34 (53%) liver metastases had AI. A total of 12 metastases were matched with corresponding primary CRCs; in 11 of 12 (92%) pairs, the metastasis had same AI status as the corresponding primary tumor. APAF-1 mRNA transcription level was significantly decreased with AI in liver metastases (P=0.009). Promoter hypermethylation was found in three of 35 (9%) primary CRCs and one of 15 (7%) liver metastases by methylation-specific PCR but was not correlated with AI. MIN was observed in 11 of 49 (23%) primary CRCs and was a favorable prognostic factor. Our results suggest that APAF-1 gene haploinsufficiency caused by AI increases with tumor progression, and relates to hepatic metastasis.

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Acknowledgements

This study was supported in part by funding from the Rod Fasone Memorial Cancer Fund (Indianapolis, IN), PO CA 29605 from the National Cancer Institute, NIH, and the Roy E Coates Foundation Laboratory.

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Correspondence to Dave S B Hoon.

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Umetani, N., Fujimoto, A., Takeuchi, H. et al. Allelic imbalance of APAF-1 locus at 12q23 is related to progression of colorectal carcinoma. Oncogene 23, 8292–8300 (2004). https://doi.org/10.1038/sj.onc.1208022

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