A high-resolution cytogenetic map of the short arm of chromosome 1 with newly isolated 411 cosmid markers was constructed by fluorescence in situ hybridization (FISH). These markers were scattered throughout chromosome 1p, but they were preferentially concentrated on R-band dominant regions such as 1p36, 1p34, 1p32, 1p22, and 1p13. Among these markers, 197 were localized on chromosome band 1p36, a region frequently deleted in neuroblastoma. Of these, 18 were precisely ordered on 1p36.1 by multicolor FISH of prophase chromosomes and "stretched" DNAs as follows: 1pter-163-41-11-1-226-586-568-614-631-665-451-199-190-561-241-74-1 76-652-1cen. The high-density map of chromosome 1p constructed here can provide useful landmarks for constructing a contig map of the short arm of chromosome 1 with YACs and cosmid clones and will expedite the identification of breakpoints and/or tumor suppressor gene(s) associated with several types of malignant tumors that frequently exhibit chromosomal aberrations or deletions of chromosome 1p.
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