Association between inflammatory bowel disease gene 5 (IBD5) and interleukin-23 receptor (IL23R) genetic polymorphisms in Malaysian patients with Crohn's disease.
OBJECTIVE
This study was aimed to investigate the possible association of Crohn's disease (CD) with inflammatory bowel disease gene 5 (IBD5) IGR2198a_1 (rs11739135), IGR2096a_1 (rs12521868) and interleukin-23 receptor (IL23R) genetic variant (rs1004819) in the Malaysian population.


METHODS
Blood samples from 80 CD patients and 100 healthy controls were recruited. Genomic DNA was extracted and analyzed by polymerase chain reaction-restriction fragment length polymorphism.


RESULTS
The results revealed that there was an increased frequency of IGR2198a_1 C allele (8.8% in CD, 1.5% in controls, P < 0.05, OR 6.30, 95% CI 1.77-22.31) and IGR2096a_1 T allele (6.9% in CD, 1.5% in controls, P < 0.05, OR 4.85, 95% CI 1.33-17.69) in the CD patients as compared to the controls, suggesting the two variants were potential risk factors of CD. Both risk alleles (C and T) were highest in Indians. In contrast, no significant difference was observed for the IL23R gene variant (rs1004819) between these two groups (P = 0.941). All genotypes and alleles of this gene variant were present in equal ratios in the CD and control groups (OR 1.02, 95% CI 0.66-1.57 for T allele and OR 0.98, 95% CI 0.64-1.52 for C allele).


CONCLUSIONS
There is a strong association between both IBD5 locus variants but not the IL23R gene variant with CD in the Malaysian population. The IBD5 locus variants were highest in Indians, which may explain the increased susceptibility of this particular ethnic group to the disease.
Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. khchua@um.edu.my
Kek Heng
KH
Chua
Ida
I
Hilmi
Lay Hoong
LH
Lian
Sathya Narayanan
SN
Patmanathan
See Ziau
SZ
Hoe
Way Seah
WS
Lee
Khean Lee
KL
Goh
D003424:Crohn Disease / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000235:genetics*; D008296:Malaysia; D020641:Polymorphism, Single Nucleotide; D018123:Receptors, Interleukin / Q000235:genetics*
C515500:IL23R protein, human; D018123:Receptors, Interleukin