Presence of Single Nucleotide Polymorphisms in Transforming Growth Factor β and Insulin-Like Growth Factor 1 in Class II Malocclusions due to Retrognathic Mandible

Abstract

Aim: The aim of this study was to evaluate specific single nucleotide polymorphisms (SNP) of transforming growth factor-beta (TGF-β) (rs1800469) and insulin-like growth factor-1 (IGF-1) (rs17032362) genes in Class II individuals with a normal maxilla and retrognathic (short) mandible. Materials and methods: The study had 25 participants: 5 were assigned to the control group, which had a normal maxilla and mandible, and 20 to the experimental group, which had a structurally retrognathic mandible and a normal maxilla. The polymerase chain reaction was used with preselected primers after which Sanger sequencing was used to identify individual mutations. Results: SNP at rs1800469 (TGF-β) in the study and control groups showed significant difference (p=0.009). The Odds Ratio of 5.28 signified that the individuals with SNP at rs1800469 were at 5.28 times higher risk of developing mandibular retrognathism. The IGF SNP showed its presence in experimental group but was not statistically significant. Conclusion: Our study reports for the first time on the association between TGF-β SNP and mandibular retrognathism. Other SNP also showed its presence in the study group and its complete absence from control group directs us for further research.