STRING 9.05 
PRTFDC1 [ENSP00000318602]
phosphoribosyl transferase domain containing 1
HPRT1 [ENSP00000298556]
hypoxanthine phosphoribosyltransferase 1
Evidence suggesting a functional link:
Neighborhood in the Genome:   None, but homologous genes are neighbors in other genomes (score 0.025).  
Gene Fusions:  
none / insignificant.
Cooccurence Across Genomes:   yes (score 0.525).  
none / insignificant.
Experimental/Biochemical Data:   yes (score 0.417).  
Association in Curated Databases:  
none / insignificant.
Co-Mentioned in PubMed Abstracts:   yes (score 0.892).  
Combined Score:
Note: the two proteins have some sequence similarity (355.5 bits over 210 amino acids. click here to see the alignment).
Evidence for specific actions:
Binding:yes (score: 0.417)