Laboratory for Molecular Diagnostics
Center for Nephrology and Metabolic Disorders

Lactase

The LCT gene encodes an enzyme that is located on the plasma membran. I cleaves the disaccharide lactose into galactose and glucose. Mutations of the gene cause autosomal recessive congenital lactose intolerance. Polymorphisms in the noncoding region of the neighboring MCM6 gene regulate gene expression.

Genetests:

Clinic Method Carrier testing
Turnaround 5 days
Specimen type genomic DNA
Clinic Method Massive parallel sequencing
Turnaround 25 days
Specimen type genomic DNA
Clinic Method Genomic sequencing of the entire coding region
Turnaround 25 days
Specimen type genomic DNA
Clinic Method Target mutation analysis
Turnaround 20 days
Specimen type genomic DNA

Related Diseases:

Lactase deficiency
LCT

References:

1.

Enattah NS et al. (2002) Identification of a variant associated with adult-type hypolactasia.

[^]
2.

Olds LC et al. (2003) Lactase persistence DNA variant enhances lactase promoter activity in vitro: functional role as a cis regulatory element.

[^]
3.

Tishkoff SA et al. (2007) Convergent adaptation of human lactase persistence in Africa and Europe.

[^]
4.

Enattah NS et al. (2008) Independent introduction of two lactase-persistence alleles into human populations reflects different history of adaptation to milk culture.

[^]
5.

Kuokkanen M et al. (2006) Mutations in the translated region of the lactase gene (LCT) underlie congenital lactase deficiency.

[^]
6.

Järvelä I et al. (1998) Assignment of the locus for congenital lactase deficiency to 2q21, in the vicinity of but separate from the lactase-phlorizin hydrolase gene.

[^]
7.

Hollox EJ et al. (2001) Lactase haplotype diversity in the Old World.

[^]
8.

Harvey CB et al. (1995) DNA polymorphisms in the lactase gene. Linkage disequilibrium across the 70-kb region.

[^]
9.

Harvey CB et al. (1998) Lactase haplotype frequencies in Caucasians: association with the lactase persistence/non-persistence polymorphism.

[^]
10.

van Wering HM et al. (2002) Physical interaction between GATA-5 and hepatocyte nuclear factor-1alpha results in synergistic activation of the human lactase-phlorizin hydrolase promoter.

[^]
11.

Beja-Pereira A et al. (2003) Gene-culture coevolution between cattle milk protein genes and human lactase genes.

[^]
12.

None (2005) Evolutionary genetics: genetics of lactase persistence--fresh lessons in the history of milk drinking.

[^]
13.

Boll W et al. (1991) Structure of the chromosomal gene and cDNAs coding for lactase-phlorizin hydrolase in humans with adult-type hypolactasia or persistence of lactase.

[^]
14.

Mantei N et al. (1988) Complete primary structure of human and rabbit lactase-phlorizin hydrolase: implications for biosynthesis, membrane anchoring and evolution of the enzyme.

[^]
15.

Kruse TA et al. (1988) The human lactase-phlorizin hydrolase gene is located on chromosome 2.

[^]
16.

Harvey CB et al. (1993) Regional localization of the lactase-phlorizin hydrolase gene, LCT, to chromosome 2q21.

[^]
17.

NCBI article

NCBI 3938 [^]
18.

OMIM.ORG article

Omim 603202 [^]
19.

Orphanet article

Orphanet ID 123008 [^]
20.

Wikipedia article

Wikipedia EN (Lactase) [^]
Update: April 29, 2019