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Cell Growth & Differentiation, Vol 3, Issue 8 541-548, Copyright © 1992 by American Association of Cancer Research


ARTICLES

Identification of a human chromosome 11 gene which is differentially regulated in tumorigenic and nontumorigenic somatic cell hybrids of HeLa cells

JH Lichy, WS Modi, HN Seuanez and PM Howley
Laboratory of Tumor Virus Biology, National Cancer Institute, Bethesda, Maryland 20892.

The tumorigenicity of HeLa cells in nude mice can be suppressed by the addition of a normal human chromosome 11 in somatic cell hybrids. We have attempted to identify specific genes involved in this phenomenon by transfecting a complementary DNA expression library into a tumorigenic HeLa-fibroblast hybrid. A cell line designated F2 was isolated which displayed morphological features of the nontumorigenic hybrids, demonstrated reduced tumorigenicity in nude mice, and showed an 85% reduction in alkaline phosphatase, a consistent marker of the tumorigenic phenotype in these cells. F2 contained a single exogenous complementary DNA, which was recovered by polymerase chain reaction and designated HTS1 because of its potential association with "HeLa tumor suppression." Northern blot studies suggested differential regulation of the HTS1 gene dependent on the tumorigenicity of the cell. In nontumorigenic hybrids, RNA species of 2.8, 3.1, and 4.6 kilobases were identified. In two tumorigenic hybrid lines, the 2.8-kilobase species was markedly reduced or absent. Similarly, three nontumorigenic human keratinocyte lines expressed all three RNA species, whereas several tumorigenic cervical carcinoma cell lines lacked the 2.8-kilobase species. Chromosome localization studies mapped the HTS1 gene to chromosome 11p15, a region of chromosome 11 that is believed to contain a tumor suppressor gene. These findings indicate that HTS1 represents a novel chromosome 11 gene which may be a target of the tumor suppressor gene active in this system.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1992 by the American Association of Cancer Research.