To accomplish large-scale identification of genes from a single human chromosome, exon amplification was applied to large pools of clones from a flow-sorted human chromosome 22 cosmid library. Sequence analysis of more than one-third of the 6400 cloned products identified 35% of the known genes previously localized to this chromosome, as well as several unmapped genes and randomly sequenced cDNAs. Among the more interesting sequence similarities are those that represent novel human genes that are related to others with known or putative functions, such as one exon from a gene that may represent the human homolog of Drosophila Polycomb. It is anticipated that sequences from at least half of the genes residing on chromosome 22 are contained within this exon library. This approach is expected to facilitate fine-structure physical and transcription mapping of human chromosomes, and accelerate the process of disease gene identification.
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