PMID- 19108707 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20110714 LR - 20240316 IS - 1755-8166 (Electronic) IS - 1755-8166 (Linking) VI - 1 DP - 2008 Dec 23 TI - Validation of DNA probes for molecular cytogenetics by mapping onto immobilized circular DNA. PG - 28 LID - 10.1186/1755-8166-1-28 [doi] AB - BACKGROUND: Fluorescence in situ hybridization (FISH) is a sensitive and rapid procedure to detect gene rearrangements in tumor cells using non-isotopically labeled DNA probes. Large insert recombinant DNA clones such as bacterial artificial chromosome (BAC) or P1/PAC clones have established themselves in recent years as preferred starting material for probe preparations due to their low rates of chimerism and ease of use. However, when developing probes for the quantitative analysis of rearrangements involving genomic intervals of less than 100 kb, careful probe selection and characterization are of paramount importance. RESULTS: We describe a sensitive approach to quality control probe clones suspected of carrying deletions or for measuring clone overlap with near kilobase resolution. The method takes advantage of the fact that P1/PAC/BAC's can be isolated as circular DNA molecules, stretched out on glass slides and fine-mapped by multicolor hybridization with smaller probe molecules. Two examples demonstrate the application of this technique: mapping of a gene-specific ~6 kb plasmid onto an unusually small, ~55 kb circular P1 molecule and the determination of the extent of overlap between P1 molecules homologous to the human NF-kappaB2 locus. CONCLUSION: The relatively simple method presented here does not require specialized equipment and may thus find widespread applications in DNA probe preparation and characterization, the assembly of physical maps for model organisms or in studies on gene rearrangements. FAU - Greulich-Bode, Karin M AU - Greulich-Bode KM AD - Division Genetics of Skin Carcinogenesis, German Cancer Research Center (DKFZ), Heidelberg, Germany. k.greulich@dkfz-heidelberg.de. FAU - Wang, Mei AU - Wang M FAU - Rhein, Andreas P AU - Rhein AP FAU - Weier, Jingly F AU - Weier JF FAU - Weier, Heinz-Ulli G AU - Weier HU LA - eng GR - R33 CA088258-03/CA/NCI NIH HHS/United States GR - R44 HD044313-01/HD/NICHD NIH HHS/United States GR - R21 CA123370/CA/NCI NIH HHS/United States GR - R21 CA123370-01A1/CA/NCI NIH HHS/United States GR - R44 HD044313/HD/NICHD NIH HHS/United States PT - Journal Article DEP - 20081223 PL - England TA - Mol Cytogenet JT - Molecular cytogenetics JID - 101317942 PMC - PMC2630919 EDAT- 2008/12/26 09:00 MHDA- 2008/12/26 09:01 PMCR- 2008/12/23 CRDT- 2008/12/26 09:00 PHST- 2008/11/11 00:00 [received] PHST- 2008/12/23 00:00 [accepted] PHST- 2008/12/26 09:00 [entrez] PHST- 2008/12/26 09:00 [pubmed] PHST- 2008/12/26 09:01 [medline] PHST- 2008/12/23 00:00 [pmc-release] AID - 1755-8166-1-28 [pii] AID - 10.1186/1755-8166-1-28 [doi] PST - epublish SO - Mol Cytogenet. 2008 Dec 23;1:28. doi: 10.1186/1755-8166-1-28.