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Electrophoretic variation for X chromosome-linked hypoxanthine phosphoribosyl transferase (HPRT) in wild-derived mice.

An electrophoretic variation for hypoxanthine phosphoribosyltransferase, HPRT, has been identified in samples of Mus spretus, a field mouse from southern Europe and in M. m. castaneus, a house mouse from southeast Asia. These mice will interbreed with laboratory mice to produce viable, fertile F1 progeny. The variation for HPRT segregates as an X chromosome gene in F1 and backcross progeny. Linkage analysis involving the markers Pgk-1 and Ags indicated a gene order of centromere--Hprt--Pgk-1--Ags in crosses involving both stocks of wild mice.