Group n (%)   Group n (%)  
SNP Genotype Responder Non-responder Allele Responder Non-responder P value
g.-234A/C A/A 16 (45.7) 8 (61.5) A 50 (71.4) 20 (76.9) 0.590
(rs13015258) A/C 18 (51.4) 4 (30.8) C 20 (28.6) 6 (23.1)  
  C/C 1 (2.9) 1 (7.7)            
IVS8-128A/G G/G 31 (88.6) 11 (84.6) G 66 (94.3) 24 (92.3) 0.661
(rs17848920) G/A 4 (11.4) 2 (15.4) A 4 (5.7) 2 (7.7)  
IVS8+46C/T C/C 18 (51.4) 5 (38.5) C 51 (72.9) 17 (65.4) 0.474
(rs10930040) C/T 15 (42.9) 7 (53.8) T 19 (27.1) 9 (34.6)  
  T/T 2 (5.7) 1 (7.7)            
IVS11-143A/G* G/G 20 (57.1) 5 (38.5) G 51 (72.9) 17 (65.4) 0.474
(rs2302873) G/A 11 (31.4) 7 (53.8) A 19 (27.1) 9 (34.6)  
  A/A 4 (11.4) 1 (7.7)            
G645G C/C 25 (73.5) 12 (92.3) C 59 (86.8) 25 (96.2) 0.275
(rs17848910) C/T 9 (26.5) 1 (7.7) T 9 (13.1) 1 (3.8)  
IVS22+4C/T T/T 31 (91.2) 10 (76.9) T 65 (95.6) 23 (88.5) 0.342
(rs2268891) T/C 3 (8.8) 3 (23.1) C 3 (4.4) 3 (11.5)   
Nucleotide location number of SNP was assigned according to the DPP4 mRNA sequence (GenBank accession number: NM_001935.3). In comparison between alleles, P values were obtained by using Chi-square test or Fisher’s exact test (expected cell value < 5). Abbreviations: IVS: Intervening Sequence; SNP: Single Nucleotide Polymorphism. * Linkage with rs10930040
Table 2: Frequency of DPP4 genetic variations in diabetic patients according to response to vildagliptin add-on therapy.