Obinu, Domenica Anna and Enattah, Nabil Satri and Pedroni, Antonietta and Peltonen, Leena and Cavalli-Sforza, Luca and Dore, Maria Pina (2010) Prevalence of lactase persistence and the performance of a non-invasive genetic test in adult Sardinian patients. e-SPEN, Vol. 5 (1), e1-e5. ISSN 1751-4991. Article.
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Background & aims
Adult-type hypolactasia is a common problem in humans. In the clinical setting, the breath hydrogen test is frequently used to measure lactose nonabsorption; however, false results can occur. The prevalence of genetic lactase persistence in Sardinia and the performance of a new non-invasive genetic test based on the presence of C/T-13910 polymorphism were evaluated.
Saliva was collected from adult patients undergoing breath hydrogen test and from a control group of healthy subjects. DNA was analyzed for C/T-13910 and four additional mutations nearby.
One hundred and twenty patients and 120 controls were enrolled. In the patient group, the frequency of the C/C-13910 (homozygous genotype for lactase non-persistence) was 89.2%; the C/T (heterozygosity for lactase persistence) was 10.8%; and the T/T (homozygous for lactase persistence) was 0. The frequency for C/C, C/T, T/T was 78.3%, 21.7%, and 0, respectively, in the control group. The sensitivity, specificity and accuracy of the breath hydrogen test compared to the genetic test were 86.1%, 92.3%, and 87.5%, respectively. The concordance of the results of the two tests was highly significant (p < 0.0001).
Mutants for lactase persistence are very uncommon in Sardinia. Simplicity of genotyping −13910 C/T to assess the lactase non-persistence should make this method suitable for routine clinical testing when lactose malabsorption is suspected.
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