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. 2011 May;17(2):59-64.
doi: 10.4103/0971-6866.86176.

The first report described as an important study: The association of mannose-binding lectin gene 2 polymorphisms in children with Down syndrome

Osman Demirhan  1 , Deniz Taştemir, Ramazan Güneşaçar, Ali İrfan Güzel, Davut Alptekin
Affiliations

The first report described as an important study: The association of mannose-binding lectin gene 2 polymorphisms in children with Down syndrome

Osman Demirhan et al. Indian J Hum Genet. 2011 May.

Abstract

Background: Mannose-binding lectin gene 2 (MBL2) plays a very important role in the first line of host immune response in Down syndrome (DS). The importance of MBL2 gene polymorphisms in children with DS is unclear, and no research has addressed MBL2 gene polymorphisms in patients with DS. This is the first report describing an important association between MBL2 gene polymorphisms and infections in children with DS.

Materials and methods: We compared the frequency of single-nucleotide polymorphisms (SNPs) at two codons of the MBL2 gene in a cross sectional cohort of 166 children with DS and 229 controls. Polymorphisms at codons 54 (GGC→GAC) and 57 (GGA→GAA) in exon 1 of the MBL2 gene were typed by polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) technique using the restriction enzymes BshN1 (derivated from Bacillus sphaericus) and MboII (derivated from Moraxella bovis), respectively.

Results: MBL2 codon 54 GA genotype frequency was found to be lower in patients with DS (22.9%) than those of healthy controls (35.8%), differences were statistically significant (OR = 0.532, 95% CI = 0.339-0.836, P = 0.008). On the other hand, codon 57 polymorphism in the MBL2 gene was detected in none of the DS patients, but only one person in the control group showed codon 57 GA genotype (OR = 1.004, 95% CI = 0.996-1.013, P = 1.000).

Conclusion: Our data provides an evidence for the first time that a homozygote or heterozygote for the variant, MBL2 alleles, is not associated with infections in patients with DS, and do not influence the incidence of infections.

Keywords: Down syndrome; Mannose-binding lectin gene 2 gene polymorphisms; single-nucleotide polymorphisms.

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Conflict of interest statement

Conflict of Interest: None declared.

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