The gene loci CDK4, GLI, CHOP and MDM2 have been mapped to the q13-q15
region of chromosome 12. Using fluorescence in site hybridization ont
o simultaneously DAPI-banded metaphase chromosomes and interphase nucl
ei, we have more precisely mapped and ordered these loci, together wit
h a number of Genethon microsatellite markers. GLI and CHOP localize t
o 12q13.3-14.1, CDK4 to 12q14 and MDM2 to 12q14.3-q15, and the gene or
der is cen-GLI/CHOP-CDK4-MDM2. The Genethon microsatellites D12S80 and
D12S83 flank MDM2.