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Localization of Human ERBA2 to the 3p22----3p24.1 Region of Chromosome 3 and Variable Deletion in Small Cell Lung Cancer

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Specialty Science
Date 1988 Dec 1
PMID 2848257
Citations 12
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Abstract

Human genes homologous to the v-erbA oncogene of avian erythroblastosis virus have been mapped to at least two human chromosomes. Recently, the ERBA2 gene was shown to encode a thyroid hormone receptor and localized to chromosome 3 by using flow-sorted chromosomes. We now demonstrate that this gene is located at 3p22----3p24.1, using both somatic cell hybrids and in situ hybridization studies. Since this localization is close to the distal border of the small cell lung cancer (SCLC) 3p14----3p23 deletion, we undertook additional studies to examine the ERBA2 gene in SCLC. Using somatic cell hybrids constructed from the SCLC line NCI-H182 as well as matched patient tumor and control tissue samples, we found that ERBA2 is variably deleted. Therefore, ERBA2 defines at the molecular level the distal border of the SCLC deletion and further implies that the putative suppressor gene is located centromeric of this locus. We also determined that, at least in NCI-H182, the 3p14 breakpoint is proximal to the constitutive 3p14.2 fragile site. These studies would indicate that the mechanism or initiation site of chromosomal rearrangement in SCLC is different from that which occurs during induction of the 3p14 fragile site by aphidicolin.

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