High polymorphism of the MBL2 gene in patients with atopic dermatitis.
BACKGROUND
Low serum levels of mannose-binding lectin (MBL) are determined mainly by variant alleles of the MBL2 gene and it has been suggested that MBL may play a role in the susceptibility to atopic dermatitis (AD).


OBJECTIVE
The aim was to investigate the difference of the frequency of MBL2 variant alleles in AD patients and in a group of individuals without AD, and associate the MBL2 alleles with AD severity.


METHODS
MBL2 variant allele's frequency was investigated in 131 children with AD and 165 healthy children/adolescents matched by convenience. The severity of disease was graded according to the SCORing Atopic Dermatitis (SCORAD) index. The first exon variants were called "O" and the wild type "A". The variants in the promoter were H/L at -550 and X/Y at -221, determined by Real Time PCR.


RESULTS
Children with AD had higher frequency of allele O and the genotypes related to low or deficient levels of MBL, when compared to the healthy group (p = 0.0012 and p < 0.001, respectively), but not with AD severity.


CONCLUSIONS
Low or deficient MBL serum levels determined genetically may contribute to the predisposition for AD, but not for disease severity.
Carréra
Matilde Campos
MC
Department of Dermatology, Instituto Materno Infantil de Pernambuco, Recife, Brazil.
Moura
Patrícia
P
Crovella
Sergio
S
de Souza
Paulo Roberto Eleutério
PR
de Alencar
Luiz Cláudio Arraes
LC
Sarinho
Emanuel
E
D000293:Adolescent; D000483:Alleles; D002648:Child; D002675:Child, Preschool; D003876:Dermatitis, Atopic / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D018450:Disease Progression; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007223:Infant; D008297:Male; D037601:Mannose-Binding Lectin / Q000096:biosynthesis / Q000097:blood / Q000235:genetics*; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic
C445619:MBL2 protein, human; D037601:Mannose-Binding Lectin