Preliminary study of PAX9 single nucleotide polymorphism (rs8004560) in patients with Class II skeletal base malocclusion contributed by mandibular retrognatism

Mohd Saad, Muhammadazril and Abd Rahman, Nur Amin and Mokhtar@Makhtar, Khairani Idah and Abu Bakar, Noraini and Kharuddin, Azrul Fazwan and Wan Taib, Wan Rohani (2018) Preliminary study of PAX9 single nucleotide polymorphism (rs8004560) in patients with Class II skeletal base malocclusion contributed by mandibular retrognatism. Archives of Orofacial Sciences, 13 (2). pp. 112-118. E-ISSN 2231-7163

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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.

Item Type:	Article (Journal)
Additional Information:	7172/68343
Uncontrolled Keywords:	Keywords: Class II malocclusion, PAX9, retrognathic mandible, rs8004560 SNP.
Subjects:	R Medicine > RK Dentistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Dentistry Kulliyyah of Dentistry > Department of Fundamental Dental and Medical Sciences Kulliyyah of Science
Depositing User:	Asst Prof Dr Noraini Abu Bakar
Date Deposited:	14 Dec 2018 15:00
Last Modified:	30 Jan 2019 09:47
URI:	http://irep.iium.edu.my/id/eprint/68343

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