Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
Department of Stomatology, Federal University of Paraná, Curitiba, Brazil.
PLoS One. 2024 May 21;19(5):e0303551. doi: 10.1371/journal.pone.0303551. eCollection 2024.
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.
垂直面型是面部和谐的一个关键因素,对面部美观满意度和正畸治疗计划都有重要影响。然而,单核苷酸多态性(SNP)在垂直面型发育中的作用仍知之甚少。本研究旨在探讨与颅颌面骨发育相关基因中的一些 SNP 对不同垂直面型形成的潜在影响。通过治疗前的数字侧位头颅侧位片,由两位资深正畸医生评估垂直面型。根据美国正畸医师协会的推荐测量方法确定垂直面型类型。将健康的正畸患者分为以下几组:“正常生长型”(对照组)、“高生长型”和“低生长型”。排除有正畸或面部手术干预史的患者。从唾液样本中提取基因组 DNA,采用实时聚合酶链反应(PCR)对 RUNX2、BMP2、BMP4 和 SMAD6 基因中的 7 个 SNP 进行基因分型。通过单变量和多变量分析评估组间的基因型分布,并通过年龄进行调整(alpha = 5%)。共纳入 272 例患者,其中 158 例(58.1%)为“正常生长型”,68 例(25.0%)为“高生长型”,46 例(16.9%)为“低生长型”。SNP rs1200425(RUNX2)和 rs1005464(BMP2)在单变量和多变量分析中与高生长型垂直面型相关(p 值<0.05)。同时评估这两个 SNP rs1200425-rs1005464 时观察到协同效应(优势比=4.0;95%置信区间=1.2-13.4;p 值=0.022)。综上所述,本研究支持遗传因素与垂直面型建立之间的联系。RUNX2 和 BMP2 基因中的 SNP 被确定为高生长型面型的潜在贡献因素。
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