RGD Reference Report - Paraoxonase 1 gene polymorphisms and enzyme activities in diabetes mellitus. - Rat Genome Database

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Paraoxonase 1 gene polymorphisms and enzyme activities in diabetes mellitus.

Authors: Flekac, M  Skrha, J  Zidkova, K  Lacinova, Z  Hilgertova, J 
Citation: Flekac M, etal., Physiol Res. 2008;57(5):717-26. Epub 2007 Oct 11.
RGD ID: 2313270
Pubmed: PMID:17949258   (View Abstract at PubMed)

Paraoxonase 1 (PON1), an antioxidant enzyme closely associated with HDL (high-density lipoproteins), preserves LDL (low-density lipoproteins) against oxidation. Less protection may be therefore supposed by decreased PON1 activity. This study was undertaken to investigate the association of PON1 gene polymorphisms with diabetic angiopathy and to evaluate the relationship of these polymorphisms with PON1 activity. Total of 86 Type 1 (T1DM) and 246 Type 2 (T2DM) diabetic patients together with 110 healthy subjects were examined. DNA isolated from leukocytes was amplified with polymerase chain reaction (PCR) followed by restriction enzyme digestion. The products were analyzed for L55M and Q192R polymorphisms in coding region and for -107 C/T and -907 G/C in promotor sequence of PON1. Serum enzyme activity was measured spectrophotometrically. Significant differences were found between T1DM or T2DM and control persons in L55M polymorphism (allele M more frequent in T1DM and T2DM vs. controls, p<0.05) and Q192R polymorphism (R allele less frequent in T1DM and T2DM vs. controls, p<0.01) of the PON1 gene. Serum PON1 activity was significantly decreased in T1DM (110+/-68 nmol/ml/min) and T2DM patients (118+/-69 nmol/ml/min) compared to the control persons (203+/-58 nmol/ml/min), both p<0.01. The presence of MM and QQ genotypes was accompanied by lower PON1 activity than of LL and RR genotypes (p<0.05), respectively. Better diabetes control was found in patients with LL than with MM genotypes and similarly in RR genotype than QQ genotype with p<0.05. Significantly different allele frequencies were found in diabetic patients with macroangiopathy than in those without it (M: 0.59 vs. 0.44. R: 0.12 vs. 0.19, p<0.01). The association of PON1 polymorphisms, lower PON1 activity and poorer diabetes control found in patients with macroangiopathy further support the idea of genetic factors contributing to the development of vascular disorders in diabetes.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
diabetic angiopathy  IAGP 2313270associated with Diabetes Mellitus more ...RGD 
diabetic angiopathy  ISOPON1 (Homo sapiens)2313270; 2313270associated with Diabetes Mellitus more ...RGD 
type 1 diabetes mellitus  IEP 2313270protein:decreased expression:serumRGD 
type 1 diabetes mellitus  ISOPON1 (Homo sapiens)2313270; 2313270protein:decreased expression:serumRGD 
type 2 diabetes mellitus  IEP 2313270protein:decreased expression:serumRGD 
type 2 diabetes mellitus  ISOPON1 (Homo sapiens)2313270; 2313270protein:decreased expression:serumRGD 

Objects Annotated

Genes (Rattus norvegicus)
Pon1  (paraoxonase 1)

Genes (Mus musculus)
Pon1  (paraoxonase 1)

Genes (Homo sapiens)
PON1  (paraoxonase 1)


Additional Information