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pubmed-article:7936646pubmed:abstractTextThe DCC tumor suppressor gene has been shown to be frequently deleted or its expression reduced or absent in colorectal, gastro-intestinal, pancreatic, prostatic, and breast carcinomas, and glioblastomas. By allelotype analysis using the DCC-flanking polymorphic marker D18S5 we have previously shown that allelic deletions at 18q21 occur in 40% of male germ cell tumors (Murty et al., 1994). In order to further understand the role of DCC gene in germ cell tumorigenesis, we evaluated deletions by loss of heterozygosity (LOH) and mRNA expression by RT-PCR in tumor tissues and cell lines. Analysis of 61 paired normal-tumor DNAs using the probes D18S5, JOSH 4.4 (a polymorphism within the DCC locus) and a (CA)n polymorphism in an intron of DCC revealed that 45% of GCTs had allelic deletions. In addition, two homozygous deletions were found in the DCC gene among 91 (61 used in the LOH analysis and an additional 30) tumor DNAs when screened with the cDNA probes (pDCC 1.65, pDCC 1.9 and pDCC 1.0). By RT-PCR analysis of four normal testes, nine GCT cell lines and 14 tumor tissues, DCC gene expression was detected in all four normal testes, while four (45%) GCT cell lines and one (7%) tumor specimen showed lack of expression. In addition, DCC expression was highly reduced in three (21%) tumor tissues. The high frequency of LOH at 18q21 was characteristic of seminomas as well as all subsets of non-seminomas in primary as well as metastatic states. Frequent allelic loss in all histologic subsets, homozygous deletions, and loss of expression of DCC suggest that suppression of this gene's function is an early event in GCT development.lld:pubmed
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pubmed-article:7936646pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:7936646pubmed:articleTitleFrequent allelic deletions and loss of expression characterize the DCC gene in male germ cell tumors.lld:pubmed
pubmed-article:7936646pubmed:affiliationCell Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, New York 10021.lld:pubmed
pubmed-article:7936646pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7936646pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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