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PubMed | National Institute of Immunohaematology Indian Council of Medical Research
Type: Journal Article | Journal: International journal of laboratory hematology | Year: 2012

Pyrimidine 5 nucleotidase type I (P5N-1) deficiency is the most frequent abnormality of cell nucleotide metabolism causing hereditary non spherocytic hemolytic anemia (HNSHA). The aim of this study was to develop a simple method of determination of P5N-1 activity in human erythrocytes using an ELISA readerDetermination of P5N-1 activity is based on the liberation of inorganic phosphorus (Pi) after incubation with uridine monophosphate/cytidine monophosphate. Inorganic phosphorus (Pi), a product of the enzymatic reaction is directly quantitated from its ultraviolet absorbance. Purine/Pyrimidine nucleotides ratio (OD 260: OD 280) was also measuredP5N-1 deficient patients showed reduction in P5N-1 activity (Mean SD; 4.06 0.66 using an ELISA reader & 6.25 1.37 using a spectrophotometer) as compared to the normal control group (ELISA reader: 13.24 3.42 & Spectrophotometer: 18.25 3.20). Heterozygotes showed intermediate activity (ELISA reader: 6.06 0.48 & Spectrophotometer: 8.06 1.28), however they would have been missed on screening using the Purine/Pyrimidine nucleotides ratioDetermination of P5N-1 activity by using an ELISA reader is a new, simple, less time consuming and reliable method. It also avoids the use of radioactive material or HPLC which is a significant advantage.

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