Kanjana Leejinda. A study of the association between CTLA-4, TAB2 and SUMO4 genes polymorphisms and type 1 diabetes in the Thai population . Master's Degree(Immunology). Mahidol University. : Mahidol University, 2007.
A study of the association between CTLA-4, TAB2 and SUMO4 genes polymorphisms and type 1 diabetes in the Thai population
Abstract:
Type 1 diabetes is a multifactorial disease, in which both genetic and
environmental factors have been implicated in its pathogenesis. Several genes are
involved in the mechanism of controlling immune responses which is likely to be
contributed to the development of autoimmune disease. These include CTLA-4, TAB2
and SUMO4. CTLA-4, located on chromosome 2q33, which has been shown to play
an inhibitory role in the regulation of T cell activation, leading to limitation of immune
response. TAB2 and SUMO4, located on chromosome 6q25, are involved in the
regulation of NF-kB activation which controls cellular proliferation and apoptosis in
the immune and inflammatory response. Thus, from functional points of view, they
might be candidate genes that could be related to type 1 diabetes. The genetic studies
have shown the association between polymorphisms of these genes and type 1
diabetes in several populations. Since the genes that cause susceptibility to the disease
could be different among various ethnic populations, the aim of this study was to
investigate whether there is an association between any single nucleotide
polymorphisms (SNPs) of these genes and type 1 diabetes in Thai population.
The single nucleotide polymorphism (SNPs) including SNP-318C>T,
SNP49A>G of CTLA-4, SNP001Msp, SNP268Hha and SNP012Taq of TAB2 and
SNP163A>G of SUMO4 genes were chosen for the study of their association with
type 1 diabetes in Thai patients. Eighty seven type 1 diabetic patients and 129 nondiabetic
controls were recruited. Polymerase chain reaction-restriction fragment
length polymorphism (PCR-RFLP) and mismatch PCR-RFLP analysis followed by
DNA direct sequencing were the method. It was found that genotype and allele
frequencies of these SNPs were not significantly difference between type 1 diabetic
patients and non-diabetic controls.
In conclusion, the results of this study suggest that there is no association
between any studied SNPs of the CTLA-4, SUMO4 and TAB2 genes and type 1
diabetes in Thai population. However, a larger sample size should be tested before
any definite conclusion is drawn.