The aryl hydrocarbon hydroxylase (Ah) locus and a novel restriction-fragment length polymorphism (RFLP) are located on mouse chromosome 12

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Abstract
The aryl hydrocarbon hydroxylase (Ah) locus that controls the induction of chemical carcinogen-metabolizing enzymes in mice has been found to be linked to a new restriction-fragment length polymorphism (RFLP). Only C57 BL/6 and closely related inbred strains displayed a 7.6-kbHindIII restriction fragment, while all other inbred strains tested displayed an 11.2-kbHindIII restriction fragment when using plasmid pRC2.3 as the hybridization probe. Polymorphisms in this region can also be detected with two other restriction enzymes:SacI andEcoRV. Linkage ofAh and the restriction-fragment length polymorphism was first detected using the BXD (C57BL/6 × DBA/2) recombinant inbred strains and was confirmed by a backcross. Both the restriction-fragment length polymorphism andAh were not linked to the standard genetic markersHba, Hbb, b, d, C-3, andW. However, comparison of the RFLP strain distribution pattern in the BXD recombinant inbred set with the strain distribution pattern of another RFLP, known to be located on chromosome 12, shows complete concordance in 24 of 24 strains, thereby locatingAh on chromosome 12.