Single Nucleotide Polymorphisms in RUNX2 and BMP2 contributes to different vertical facial profile

Author:

Reis Caio Luiz Bitencourt,Matsumoto Mirian Aiko Nakane,Stuani Maria Bernadete Sasso,Romano Fábio Lourenço,Scariot RafaelaORCID,Schroder Angela Graciela Deliga,Nelson-Filho Paulo,Kirschneck Christian,Beisel-Memmert Svenja,Küchler Erika CalvanoORCID

Abstract

The vertical facial profile is a crucial factor for facial harmony with significant implications for both aesthetic satisfaction and orthodontic treatment planning. However, the role of single nucleotide polymorphisms (SNPs) in the development of vertical facial proportions is still poorly understood. This study aimed to investigate the potential impact of some SNPs in genes associated with craniofacial bone development on the establishment of different vertical facial profiles. Vertical facial profiles were assessed by two senior orthodontists through pre-treatment digital lateral cephalograms. The vertical facial profile type was determined by recommended measurement according to the American Board of Orthodontics. Healthy orthodontic patients were divided into the following groups: “Normodivergent” (control group), “Hyperdivergent” and “Hypodivergent”. Patients with a history of orthodontic or facial surgical intervention were excluded. Genomic DNA extracted from saliva samples was used for the genotyping of 7 SNPs in RUNX2, BMP2, BMP4 and SMAD6 genes using real-time polymerase chain reactions (PCR). The genotype distribution between groups was evaluated by uni- and multivariate analysis adjusted by age (alpha = 5%). A total of 272 patients were included, 158 (58.1%) were “Normodivergent”, 68 (25.0%) were “Hyperdivergent”, and 46 (16.9%) were “Hypodivergent”. The SNPs rs1200425 (RUNX2) and rs1005464 (BMP2) were associated with a hyperdivergent vertical profile in uni- and multivariate analysis (p-value < 0.05). Synergistic effect was observed when evaluating both SNPs rs1200425- rs1005464 simultaneously (Prevalence Ratio = 4.0; 95% Confidence Interval = 1.2–13.4; p-value = 0.022). In conclusion, this study supports a link between genetic factors and the establishment of vertical facial profiles. SNPs in RUNX2 and BMP2 genes were identified as potential contributors to hyperdivergent facial profiles.

Funder

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Alexander von Humboldt-Stiftung

Fundação de Amparo à Pesquisa do Estado de São Paulo

Publisher

Public Library of Science (PLoS)

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