A comparative analysis of allelic and genotype distribution of polymorphic markers Val762Ala and Leu54Phe of ADPRT1 gene encoding poly(ADP-ribose)polymerase I has been performed in chronic glomerulonephritis patients compared to normal controls. This has shown a significant difference in the ADPRTI gene polymorphic marker Val762Ala allelic and genotype frequency distribution between chronic glomerulonephritis patients and healthy controls (according to Fisher's exact test). At the same time the allelic and genotype frequency for a polymorphic marker Leu54Phe distribution did not show significant difference between these groups. Therefore, we have concluded that the ADPRTI gene polymorphic marker Val762Ala is associated with the development of chronic glomerulonephritis in Russian patients of the Moscow region.