Variants in the interleukin-1 alpha and beta genes, and the risk for periodontal disease in dogs

• Published in: Journal of genetics Vol. 94; no. 4; pp. 651 - 659
• Main Authors: ALBUQUERQUE, C., MORINHA, F., MAGALHÃES, J., REQUICHA, J., DIAS, I., GUEDES-PINTO, H., BASTOS, E., VIEGAS, C.
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01.12.2015; Springer; Springer Nature B.V
• Subjects: Alleles; Animal Genetics and Genomics; Animals; Biomedical and Life Sciences; Case-Control Studies; Cytokines; Dental health; Dogs; Ethylenediaminetetraacetic acid; Evolutionary Biology; Genes; Genetic aspects; Genetic diversity; Genetic polymorphisms; Genetic Predisposition to Disease - genetics; Genetic research; Genetic Variation - genetics; Genetics; Genotype; Interleukin-1alpha - genetics; Interleukin-1beta - genetics; Interleukins; Life Sciences; Medical research; Medicine, Experimental; Microbial Genetics and Genomics; Periodontal Diseases - genetics; Plant Genetics and Genomics; Polymorphism; Research Article; Risk; interleukin-1; dog; genetic variations; periodontal disease
• ISSN: 0022-1333; 0973-7731
• DOI: 10.1007/s12041-015-0576-z

Elevated levels of interleukin-1 (IL-1) have been shown to amplify the inflammatory response against periodontopathogenic bacteria. In humans, polymorphisms in the IL1A and IL1B genes are the most well-studied genetic polymorphisms associated with periodontal disease (PD). In contrast to human, there is a lack of knowledge on the genetic basis of canine PD. A case–control study was conducted in which a molecular analysis of dog IL1A and IL1B genes was performed. Of the eight genetic variants identified, seven in IL1A gene and one in IL1B gene, IL1A/1_g.388A >C and IL1A/1_g.521T >A showed statistically significant differences between groups (adjusted OR (95% CI): 0.15 (0.03–0.76), P= 0.022; 5.76 (1.03–32.1), P= 0.046, respectively). It suggests that in the studied population the IL1A/1_g.388C allele is associated with a decreased PD risk, whereas the IL1A/1_g.521A allele can confer an increased risk. Additionally, the IL1A/2_g.515G >T variation resulted in a change of amino acid, i.e. glycine to valine. In silico analysis suggests that this change can alter protein structure and function, predicting it to be deleterious or damaging. This work suggests that IL1 genetic variants may be important in PD susceptibility in canines.