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The human thrombin receptor and proteinase activated receptor‐2 genes are tightly linked on chromosome 5q13

The thrombin receptor (TR) and proteinase activated receptor‐2 (PAR‐2) may represent the prototypes of an emerging family of cell‐surface receptors that effect cell activation events mediated by serine proteases generated during inflammatory, fibrinolytic or haemostatic‐regulated pathways. To further characterize the molecular genetics of these receptors, we have refined the genetic and physical mapping of both PAR‐2 and TR. Utilization of two distinct radiation hybrid mapping panels with different levels of resolution demonstrated that both genes are tightly linked to the microsatellite markers D5S424, D5S1977, D5S2529 and D5S2596 (in order of decreasing LOD scores, from 13.7 for D5S424 to 7.7 for D5S2596). Physical mapping using yeast artificial chromosomes (YACs) and inversion field gel electrophoresis demonstrated that they are maximally separate by 90 kb. If the association of TR and PAR‐2 genes resulted from a relatively recent gene duplication event from a common ancestral gene, these observations provide a general framework for the identification of gene transcripts representing alternative proteolytically activated receptors which may be clustered within this region of the human genome. These observations are especially relevant given recent evidence that murine and human platelets express alternative signalling mechanisms or receptors for thrombin.