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In our previous work, detailed deletion mapping of ovarian cancers indicated that a 300-kb region of chromosome 6q27 was likely to contain one or more putative tumor suppressor genes associated with development of this type of cancer. DNA sequencing in the region disclosed the presence of AF-6, a gene that had been identified as the ALL-1 fusion partner involved in acute myeloid leukemias with t(6;11)(q27;q23) translocations. In the work reported here, we determined the complete genomic sequence of the AF-6 gene, including exon-intron boundaries, and found six DNA polymorphisms. One of them, an insertion/deletion polymorphism, determined the presence or absence of seven amino acids in the AF-6 product. We also identified two alternatively spliced forms of the gene; the two novel transcripts would encode additional C-terminal peptides in comparison to the reported protein. Sequencing of seven cosmid clones that covered the entire gene revealed 32 exons (not including one exon involved in the insertion/deletion polymorphism), spanning approximately 140 kb of genomic DNA. These results may contribute to an understanding of the mechanism causing chromosomal translocations in leukemic cells.

Complete Genomic Structure, DNA Polymorphisms, and Alternative Splicing of the Human AF-6 Gene