Localization of a candidate colon tumor-suppressor gene (DRA) to 7q22-q31. 1 by fluorescence in situ hybridization
- Fox Chase Cancer Center, Philadelphia, PA (United States)
- Medical Univ. of South Carolina, Charleston, SC (United States)
The authors have previously reported that the DRA gene is located on chromosome 7. This assignment was based on Southern blot hybridization of a DRA cDNA to genomic DNA from rodent-human somatic cell hybrids. In this report, they localize the DRA gene to chromosome band 7q22-q31.1 by fluorescence in situ hybridization (FISH) with a full-length (2.9 kb) cDNA as probe. Metaphase spreads from normal human lymphocytes were prepared according to the method of Fan et al. The cDNA clone 611C was labeled with biotin-11-dUTP using a nick-translation kit (Oncor) followed by purification on a Sephadex G50-fine column. FISH and detection of immunofluorescence were performed according to the technique of Pinkel et al. with minor modifications. The chromosome preparations were stained with both diamidino-2-phenylindole and propidium iodide (Oncor) and observed with a Zeiss Axiophot fluorescence microscope. Hybridization was detected on chromosome 7 in 22 of 47 spreads examined. Of 89 fluorescent signals on all chromosomes, 44 (49%) were located on 7q. All signals on chromosome 7 appeared to be located at 7q22-q31.1. Hybridization is in the vicinity of the met protooncogene locus at 7q31.
- OSTI ID:
- 6903644
- Journal Information:
- Genomics; (United States), Journal Name: Genomics; (United States) Vol. 20:1; ISSN GNMCEP; ISSN 0888-7543
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mapping small DNA sequences by fluorescence in situ hybridization directly on banded metaphase chromosomes
The genes for the {alpha}-type HC3 (PMSA2) and {beta}-type HC5 (PMSB1) subunits of human proteasomes map to chromosomes 6q27 and 7p12-p13 by fluorescence in situ hybridization