Preliminary study of PAX9 single nucleotide polymorphism (rs8004560) in patients with Class II skeletal base malocclusion contributed by mandibular retrognatism
- Author:
Muhammadazril Mohd. Saad
1
Author Information
1. Kulliyyah of Dentistry, International Islamic University Malaysia, 25200 Kuantan, Pahang, Malaysia.
- Collective Name:Nur Amin Abd Rahman; Khairani Idah Mokhtar; Noraini Abu Bakar; Azrul Fazwan Kharuddin; Wan Rohani Wan Taib
- Publication Type:Journal Article
- Keywords:
Class II malocclusion, PAX9, retrognathic mandible, rs8004560 SNP.
- From:Archives of Orofacial Sciences
2018;13(2):112-118
- CountryMalaysia
- Language:English
-
Abstract:
Polymorphism in PAX9 (rs8004560), a gene responsible for craniofacial and tooth development, is
often associated with Class II/Div2 malocclusion. This study aimed to detect the presence of PAX9 SNP
(rs8004560) and to determine its genotype and allele distribution in Class II skeletal base malocclusion,
contributed by retrognathic mandible, in the local Malaysian population. The association of PAX9 SNP
(rs8004560) with Class II skeletal base malocclusion was also determined. A case control study was performed
on 30 samples; 15 from Class II skeletal base malocclusion, and 15 from Class I skeletal base subject as control.
Cephalometric measurements were performed prior to saliva samples collection. Genomic DNA was extracted
from unstimulated saliva of all subjects, and the DNA was amplified using specific primers for marker rs8004560,
followed by genotyping by sequencing. SHEsis online software was used to analyse Hardy-Weinberg Equilibrium
(HWE) for cases and controls. Allelic and genotypic frequencies were compared between cases and controls.
Significant difference in allele frequency was observed within the group whereby G allele was over-represented in
the analysed population (p<0.05). However, when compared between cases and control; there was no significant
association between PAX9 SNP (rs8004560) with Class II skeletal base malocclusion (p=0.56, OR=0.71; 95%
CI=0.225-2.246). The distribution of genotype frequency in both groups were consistent with HWE (p>0.05).
Although no genetic association between PAX9 SNP (rs8004560) with Class II skeletal base malocclusion was
observed, significant difference in allele frequency observed might provide some indication in the involvement of
PAX9 polymorphism in Class II skeletal base malocclusion contributed by retrognathic mandible. Further
research utilising larger sample size will be required in order to determine the role of PAX9 gene in the aetiology
of Class II skeletal base malocclusion observed in the local Malaysian population.
- Full text:1.2018my0162.pdf
