The human phosphatidylinositol (PI) 3-kinase p85 alpha subunit gene and its homologue p85 beta were assigned to human chromosomes by analysis of their segregation in a panel of somatic cell hybrids using human-specific polymerase chain reaction primers. The p85 alpha locus was only present in hybrids retaining the human chromosome 5q. The presence of the p85 beta locus coincided with the presence of chromosome 19. The precise chromosomal sublocalization of these two genes was then determined by in situ hybridization. We confirmed the localization of the p85 alpha gene at 5q12-q13, as recently described (Cannizzaro, L.A., Skolnik, E.Y., Margolis, B., Croce, C.M., Schlesinger, J. & Huebner, K. (1991). Cancer Res., 51, 3818-3820) and positioned the p85 beta locus at 19q13.2-q13.4.
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