Abstract
Twenty-eight sequence-tagged sites (STSs) were newly generated from the DNA sequences of vector-insert junctions from yeast artificial chromosomes (YACs) anchored at chromosome 21q22.1 region. The insert DNAs adjacent to vector arms were specifically amplified through inverse PCR method to clone into pUC19 vector for sequencing. Sixty DNA junctions from 44 CEPH YAC clones were cloned and sequenced. Of these DNA sequences of junctions between vector-arms and DNA inserts, twenty-eight STSs were finally obtained to show the accurate amplification, which is specific for human chromosome 21. The sets of 28 STSs were useful to build fine YAC contigs by STS-mediated YAC walking at the 21q22.1 region.
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