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Chromosomal localization of the human G-CSF gene to 17q11 proximal to the breakpoint of the t(15;17) in acute promyelocytic leukemia.

The G-CSF gene encodes a hematopoietic colony-stimulating factor (CSF) that promotes growth, differentiation, and survival of neutrophilic granulocytes. By analysis of somatic cell hybrids and in situ chromosomal hybridization, we localized this gene to human chromosome 17, at bands q11 to q12, the region of the breakpoint on chromosome 17 in the 15;17 translocation [t(15;17)] characteristic of acute promyelocytic leukemia. To determine the position of the G-CSF gene in relation to the breakpoint junctions and to evaluate the possible role of G-CSF in the pathogenesis of promyelocytic leukemia, we applied the techniques of in situ chromosomal hybridization and Southern blot analysis to leukemia cells from eight acute promyelocytic leukemia patients who had a t(15;17). Our results indicate that the G-CSF gene is proximal to the breakpoint of the t(15;17) and that this gene remains on the rearranged chromosome 17. Southern blot analysis using conventional and pulsed-field gel electrophoresis did not reveal rearranged restriction fragments, indicating that no rearrangements had occurred within the G-CSF gene or in surrounding sequences.