Mapping of the genes encoding mouse thromboxane A2 receptor and prostaglandin E receptor subtypes EP2 and EP3

Abstract Thromboxane A 2 (TXA 2 ) and prostaglandin E 2 (PGE 2 ) are two of the most representative eicosanoids that are formed from arachidonic acid. They produce a broad spectrum of biological effects mediated through specific cell surface receptors. We have mapped genetic loci for TXA 2 receptor, Tbxa2r , and for PGE 2 receptor subtypes EP 2 and EP 3 , Ptgerep2 and Ptgerep3 , respectively, using restriction fragment length variants in interspecific backcross mice. None of the three loci cosegregated with each other. Tbxa2r mapped to Chr 10, Ptgerep2 mapped to the centromeric region of Chr 15, and Ptgerep3 mapped to the distal end of Chr 3. Possible human loci for these receptors are predicted based on the homology between mouse and human chromosomes.