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J Pediatr Gastroenterol Nutr. 2007 Oct;45(4):503-6.

Decline of lactase activity and c/t-13910 variant in Sardinian childhood.

Author information

  • 1Department of Pediatric Science and Clinical Medicine, University of Cagliari, Cagliari, Italy. schirrue@yahoo.it

Abstract

OBJECTIVES:

Our study aims to determine the age of onset of adult-type hypolactasia in Sardinians, and to establish the age at which genotyping of the C/T-13910 variant can be used reliably in the diagnosis of lactose malabsorption.

PATIENTS AND METHODS:

A lactose breath hydrogen test was given to 383 randomly selected patients, from 3 to 19 years old.

RESULTS:

The C/C-13910 genotype was found in 90% of patients; the frequency of the positive lactose breath hydrogen test increased with age and reached a prevalence of 85% at 9 years.

CONCLUSIONS:

In Sardinians, adult-type hypolactasia becomes phenotypically evident in all individuals older than 9 years, suggesting that this should be considered the minimum age at which the genetic test for lactase nonpersistence should be applied.

PMID:
18030226
[PubMed - indexed for MEDLINE]
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