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Updated: May 7, 2026
Measuring Lactase Enzymatic Activity in the Teaching Lab
Published on: August 6, 2018
The Phenotype/Genotype Correlation of Lactase Persistence among Omani Adults
Abdulrahim Al-Abri1, Riad Bayoumi
1Department of Biochemistry, College of Medicine & Health Sciences, Sultan Qaboos University, P.O. Box- 35, Postal Code 123, Muscat, Sultanate of Oman.
Objective:
To examine the correlation of lactase persistence phenotype with genotype in Omani adults.
Methods:
Lactase persistence phenotype was tested by hydrogen breath test in 52 Omani Adults using the Micro H2 analyzer. Results were checked against genotyping using direct DNA sequencing.
Results:
Forty one individuals with C/C-13910 and T/T-13915 genotypes had positive breath tests (≥20 ppm); while eight of nine individuals with T/C-13910 or T/G-13915 genotypes had negative breath tests (<20 ppm) and two subjects were non-hydrogen producers. The agreement between phenotype and genotype using Kappa value was very good (0.93).
Conclusion:
Genotyping both T/C-13910 and T/G-13915 alleles can be used to assist diagnosis and predict lactose intolerance in the Omani population.
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