title: The Phenotype/Genotype Correlation of Lactase Persistence among Omani Adults.
abstract: 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).
  
  
  CONCLUSIONS
  Genotyping both T/C-13910 and T/G-13915 alleles can be used to assist diagnosis and predict lactose intolerance in the Omani population.
authors.affiliation: Department of Biochemistry, College of Medicine & Health Sciences, Sultan Qaboos University, P.O. Box- 35, Postal Code 123, Muscat, Sultanate of Oman.
authors.forename: Abdulrahim
authors.initials: A
authors.lastname: Al-Abri
authors.forename: Riad
authors.initials: R
authors.lastname: Bayoumi
keywords: Hydrogen Breath Test; Lactase Persistence; Lactose Intolerance; Oman; T/C-13910; T/G-13915
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