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. 1988 Aug;8(8):3143–3149. doi: 10.1128/mcb.8.8.3143

Genetic tagging of tumor cells with retrovirus vectors: clonal analysis of tumor growth and metastasis in vivo.

B Korczak 1, I B Robson 1, C Lamarche 1, A Bernstein 1, R S Kerbel 1
PMCID: PMC363542  PMID: 3211140

Abstract

Retrovirus vector infection was used to introduce large numbers of unique genetic markers into tumor cell populations for the purpose of analyzing comparative changes in the clonal composition of metastatic versus that of nonmetastatic tumors during their progressive growth in vivo. The cell lines used were SP1, a nonmetastatic, aneuploid mouse mammary adenocarcinoma, and SP1HU9L, a metastatic variant of SP1. Cells were infected with delta e delta pMoTN, a replication-defective retrovirus vector which possesses the dominant selectable neo gene and crippled long terminal repeats. G418r colonies were obtained at a frequency of 4 x 10(-3). Southern blot analysis of a number of clones provided evidence of random and heritable integration of one or two copies of the proviral DNA. Clonal evolution of primary tumor growth and the nature of lineage relationships among spontaneous metastases and primary tumors were analyzed by subcutaneously injecting 10(5) cells from a pooled mixture of 3.6 x 10(2) G418r SP1HU9L or 10(4) G418r SP1 colonies into syngeneic CBA/J mice. The most striking finding was the relative clonal homogeneity of advanced primary tumors; they invariably consisted of a small number (less than 10) of distinct clones despite the fact that hundreds or thousands of uniquely marked clones had been injected. In the case of the metastatic SP1HU9L cells, the nature of these "dominant" clones varied from one tumor to another. Analysis of a number of lung metastases revealed that a proportion of them were derived from dominant primary tumor clones and were composed of one, and sometimes two, distinct progenitors. In some animals, all the lung metastases were derived from a common progenitor clone, whereas in others, each metastatic nodule had a different progenitor. The results show the following. (i) Retrovirus vector infection can be used to introduce large numbers of unique and stable clonal markers into tumor cell populations. (ii) The progeny of a very limited number of clones dominate in advanced primary tumors. (iii) Mammary carcinoma metastases are of mono- or biclonal origin. The significance of the results is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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