Abstract:
:The critical region on human chromosome 3p21.3 harboring a putative lung cancer tumor suppressor gene (TSG) was previously defined by allelotyping and recently refined by overlapping homozygous deletions. We report the construction of a 700-kb (cosmid and one P1 phage) clone contig covering the deletion overlap and its flanks. The minimal set of 23 cosmids comprises 600 kb and is extended by one P1 phage to 700 kb to cover the distal breakpoint of the overlap. The clone contig was extensively characterized by restriction and expression mapping to produce high resolution physical and transcription maps of the cloned region. Potential transcribed fragments were detected by hybridization with PCR-amplified cDNA libraries, direct cDNA selection "zoo" blotting, cDNA screening, and identification of 24 CpG islands. Thus far, 15 new genes represented by partial or full-length cDNAs were isolated, characterized, and precisely positioned on the contig. Two previously cloned genes, namely GNAI-2 and GNAT-1, were also positioned. In addition, the telomeric breakpoint of the NCI H740 deletion and centromeric breakpoint of the overlapping GLC20 deletion were discovered and mapped to define precisely the candidate TSG region. This large cosmid clone contig and high resolution maps will prove crucial in the identification of the lung cancer TSG(s).
journal_name
Cancer Resjournal_title
Cancer researchauthors
Wei MH,Latif F,Bader S,Kashuba V,Chen JY,Duh FM,Sekido Y,Lee CC,Geil L,Kuzmin I,Zabarovsky E,Klein G,Zbar B,Minna JD,Lerman MIsubject
Has Abstractpub_date
1996-04-01 00:00:00pages
1487-92issue
7eissn
0008-5472issn
1538-7445journal_volume
56pub_type
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