| genes, erbb | Retrovirus-associated DNA sequences (erbb) originally isolated from, or related to, the avian erythroblastosis virus (aev). These genes code for the epidermal growth factor receptor (egfr) family of receptors which is important in the control of normal cell proliferation and in the pathogenesis of human cancer. The genes include erbb-1 (genes, erbb-1), erbb-2 (genes, erbb-2), and erbb-3, all of which show abnormalities of expression in various human neoplasms. (12 Dec 1998) |
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| genes, erbb-1 | Retrovirus-associated DNA sequences (erbb) originally isolated from the avian erythroblastosis virus (aev). The oncogene v-erbb arose by insertion of viral DNA into the c-erbb-1 proto-oncogene resulting in expression of a protein lacking the amino-terminal ligand-binding domain. V-erbb is the primary transforming gene of aev and abrogates the requirements for other mitogens. The proto-oncogene c-erbb-1 codes for the protein epidermal growth factor receptor (epidermal growth factor receptor-urogastrone). Overexpression of the gene occurs in a wide range of tumours, commonly squamous carcinomas of various sites and less commonly adenocarcinomas. The human c-erbb-1 gene is located at 7p12-13 on the short arm of chromosome 7. (12 Dec 1998) |
| genes, erbb-2 | Retrovirus-associated DNA sequences (erbb) related to the c-erbb-1 gene and identified by probes from c-erbb-1 or its avian viral homologue v-erbb. The proto-oncogene erbb-2 (c-erbb-2) codes for a protein that has structural features indicative of a growth factor receptor with close similarity to the epidermal growth factor (egf) receptor. Overexpression and amplification of the gene is associated with adenocarcinomas and with poor prognosis in breast carcinomas. The human c-erbb-2 gene is located at 17p12-21 on the short arm of chromosome 17. (12 Dec 1998) |
| proto-oncogene proteins c-erbb-2 | Cellular proteins in the epidermal growth factor receptor family encoded by the c-erbb genes. These proteins are overexpressed in a significant portion of adenocarcinomas found at various sites, especially in the breast. Gene amplification appears to be the predominant method leading to overexpression. (12 Dec 1998) |
| oncogene proteins v-erbb | Transforming proteins encoded by erbb oncogenes from the avian erythroblastosis virus. The protein is a truncated form of the egf receptor (receptors, epidermal growth factor-urogastrone) whose kinase domain is constitutively activated by deletion of the ligand-binding domain. (12 Dec 1998) |
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