The microcell hybrid‐based “elimination test” identifies a 1‐Mb putative tumor‐suppressor region at 3p22.2–p22.1 centromeric to the homozygous deletion region detected in lung cancer

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Abstract
We have previously shown that inoculation of human chromosome 3 (chr3)/A9 mouse fibrosarcoma microcell hybrids (MCHs) into severely combined immunodeficient (SCID) mice was followed by the regular elimination of certain 3p regions, whereas a 3q region was retained even after prolonged mouse passage. Using this approach, referred to as the elimination test (Et), we identified a common eliminated region (CER) of about 7 cM at 3p22–p21.3 that was absent in all tumors generated from five MCHs. A second frequently eliminated region (FER, originally called ER2) was found at 3p21.1–p14.2. These segments have been reported to be frequently deleted in a variety of carcinomas. In the following experiments, we have identified at the centromeric border of CER a common eliminated region 1 (CER1) of about 1.6 cM. We now report the results of more detailed analyses of the original tumor panel that contained 30 SCID mouse tumors. Using polymerase chain reaction and chromosome reverse painting, we have identified at the telomeric border of CER a second common eliminated region (designated as CER2). CER2 is flanked distally by RH94338 and proximally by SHGC‐154057. The size of CER2 is about 1 Mb, according to the Homo Sapiens Complete Genome databases at EMBL, and is located about 0.5 Mb centromeric to the known homozygous deletion region, identified in lung cancer. Remarkably, two chemokine‐receptor genes (CCRs), CCR8 and CX3CR1, are located within CER2, whereas seven CCRs were found within CER1.

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