Abstract
We have identified a family with an autosomal dominant platelet disorder with a predisposition for developing myeloid malignancies and have previously demonstrated linkage of this trait to chromosome 21q22.1-22.2. The nearest flanking markers, D21S1265 and D21S167, define the familial platelet disorder (FPD) critical region at a genetic distance of approximately 15.2 centimorgans and physical distance of approximately 6 megabases. This locus is of particular interest as it has previously been implicated in the pathogenesis of acute myelogenous leukemia (AML) and acute lymphoblastic leukemia (ALL) through the (8;21), (3;21) and (12;21) chromosomal translocations. In each of these cases, the CBFA2 gene is rearranged. As well, there is a potential association of this locus with the hematologic abnormalities seen in Down syndrome (trisomy 21). To identify the mutant gene in this pedigree, a positional cloning strategy has been undertaken. Several candidate genes map to this locus including: CBFA2, IFNAR1, IFNAR2, CRFB4, GART, SON, KCNE1, SCL5A3 and ATP50. CBFA2, as well as IFNAR1 and CRFB4, were the focus of initial mutational analysis efforts. In this report, we exclude CBFA2 as a candidate by Northern and Southern blotting, RNase...Continue Reading
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