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Optimization and validation of the method lactose intolerance genotyping with real-time PCR
Uppsala University. Uppsala University, Disciplinary Domain of Medicine and Pharmacy. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]


Primary lactose intolerance has been associated with a single nucleotide polymorphism located upstream of the lactase gene. The most common diagnostic tests for lactose intolerance are time-consuming and the patient is not allowed to eat and drink for 12 hours before the test is carried out. A method that can establish the genotype would be an easier way of diagnosing lactose intolerance compared to fenotypic lactose intolerance tests.

Optimization and validation of a previously published method was performed with real-time polymerase chain reaction. We used whole blood from de-identified blood donors. During the optimization and validation we used a positive control, genotype C/T from Laboratoriemedicin Västernorrland, Sundsvall.

The whole-blood was extracted using the MagNa Pure LC instrument. The reagent used was KAPA PROBE FAST qPCR Master Mix. The optimized program for real-time PCR was established to be 95°C 3min [95°C x 3sec, 55°C x 20sec, detection, 72°C x 15sec] x 50 cycles. Optimal probe concentration was found to be 0.2µM and primer concentration will be 0.5µM.

This genotyping method is a good first-stage screening test for lactoseintolerance. Before it can be used as a routine method further validation will be necessary in order to ensure that the evaluation of the results can be done in an easy and secure way.


Place, publisher, year, edition, pages
2011. , 21 p.
Keyword [en]
lactose intolerance, single nucleotide polymorphism, real-time PCR, genotype, optimization.
URN: urn:nbn:se:uu:diva-150810OAI: diva2:408892
Life Earth Science
Available from: 2011-04-06 Created: 2011-04-06 Last updated: 2011-04-06Bibliographically approved

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Uppsala UniversityDisciplinary Domain of Medicine and PharmacyFaculty of MedicineDepartment of Medical Biochemistry and Microbiology

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