CHROMOSOME ALTERATIONS AND PROTO-ONCOGENES TRANSPOSITION IN CARCINOGENESIS

两个新分离的原癌基因erbB-2和arg已经被 通过原位杂交定位于17号和1号染色体， 分别进行了分析。ErbB-2基因在乳腺癌中经常过度表达 乳腺癌和1号染色体的长臂，其中Arg 基因被定位，参与结构重排或 在大多数实体瘤中存在重复。人类 细胞色素P1-450定位于15号染色体上的 易位的断裂点15；17急性 早幼粒细胞白血病。一例北美Burkitt淋巴瘤 细胞系除了常见的8；22倒数外，还表现出 易位，另外两个易位发生在原- 癌基因位点；然而，只有myc mRNA高度上调， 提示myc基因与肿瘤的发生有关 这种B细胞恶性肿瘤的发展。

Two newly isolated proto-oncogenes, erbB-2 and arg have been localized by in situ hybridization to chromosomes 17 and 1, respectively. The erbB-2 gene is frequently overexpressed in mammary cancer and the long arm of chromosome 1, where arg gene is located, is involved in structural rearrangements or duplications in the majority of the solid tumors. Human cytochrome P1-450 was localized on chromosome 15 at the site of breakpoint of the translocation 15;17 characteristic for acute promyelocytic leukemia. A North American Burkitt's lymphoma cell line exhibits, in addition to a common 8;22 reciprocal translocation, two other translocations occurring near proto- oncogene sites; however, only myc mRNA is highly elevated, indicating that myc gene was implicated in neoplastic development of this B-cell malignancy.