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Matrix metalloproteinases gene variants and dental caries in Czech children

Abstract

Background

Matrix metalloproteinases (MMPs) play an important role in tooth formation and the mineralization of dental tissue. The aim of the study was to analyse Czech children with primary/permanent dentition polymorphisms in those genes encoding MMP2, MMP3, MMP9, MMP13, MMP16, and MMP20, which had been previously associated with dental caries in other populations.

Methods

In total, 782 Czech children were included in this case-control study. DNA samples were taken from 474 subjects with dental caries (with decayed/missing/filled teeth, DMFT ≥ 1) and 155 caries free children (DMFT = 0) aged 13–15 years, as well as 101 preschool children with early childhood caries (ECC, dmft ≥ 1) and 52 caries free children (dmft = 0), were analyzed for nine MMPs single nucleotide polymorphisms (SNPs) using real time polymerase chain reaction TaqMan assays.

Results

There were no significant differences in the allele and/or genotype frequencies of all the studied MMPs SNPs among children with dental caries in primary/permanent dentition and the healthy controls (P > 0.05). In addition, similar allele or genotype frequencies of the studied MMPs SNPs were found in children with severe dental caries in their permanent teeth (children with DMFT ≥ 6) and the healthy controls (DMFT = 0, P > 0.05).

Conclusions

This study demonstrated the lack of association between the selected SNPs in candidate genes of MMPs and the susceptibility to or severity of dental caries in both primary and permanent dentitions in Czech children.

Peer Review reports

Background

Dental caries is a multifactorial disease affecting the hard tissues of teeth in both primary and permanent dentitions. In the presence of some carbohydrates, the dental biofilm is dominated by mainly gram-positive carbohydrate-fermenting bacteria causing a pH decrease [1]. In the long-term, frequent exposure to a pH lower than 5.5 causes irreversible demineralization of the tooth enamel with a progression to dentin damage. The demineralization is caused by microbial acids, and the degradation of the dentin organic matrix was thought to have been carried out by microbial proteolytic enzymes. However, the proteases produced by the cariogenic bacteria have been found to be highly pH sensitive, and they are not able to resist the acidic pH fall (pH 4.3) during the demineralization phase [2]. Therefore, the potential role of the host derived proteases, and in particular matrix metalloproteinases (MMPs) in dentine matrix degradation, has been considered [3]. A new concept in caries research termed as “Dentin Degradonomics” has been introduced. This genomic and proteomic approach is applied to the identification of proteases and their substrates in both physiological and pathological conditions [4].

Host MMPs, which are the enzymes responsible for the degradation of intercellular substrates, play an important role in physiological processes during early tooth development [5,6,7], for example, the MMP16 gene may regulate ameloblast maturation and enamel formation [8]. Several different types of MMPs have been discovered, among them MMP2 and MMP9 (gelatinase A and B), MMP3 (stromelysin 1), MMP13 (collagenase 3), MMP16 (membrane-type MMP), and MMP20 (enamelysin). MMPs are initially synthesized as inactive zymogens, and can be activated extracellularly by several mechanisms, e.g. low pH [9]. However, host MMPs are functional only in neutral pH. This is maintained by the salivary buffer systems which allow the pH-activated MMPs to degrade the dentin matrix which has been previously demineralized by bacterial acids [10]. The host-derived proteases, and in particular MMPs, may be involved in the destruction of the collagenous dentin matrix and, therefore, in the control or progression of the carious process [3, 11]. MMPs are located throughout the dentine, along the enamel–dentine junction, and in the predentine [12]. Increased MMP presence along the dentine–enamel junction may contribute to the widening of caries along this junction, as it progresses into the dentine [13]. There are various possible sources of MMPs, in carious lesions they are released into the saliva by the salivary glands, into the crevicular fluid by the cells in the gingival crevices and into the dentinal fluids by pulpal odontoblast cells [3]. Inhibition of salivary or dentin endogenous collagenolytic enzymes may provide a preventive means against the progression of caries [4, 14, 15].

Members of MMPs family are encoded by multiple genes and their variability has been widely studied in the context of many diseases including oral diseases (such as oral cancer [16], periodontitis [17], periapical lesions [18], and dental caries [19,20,21,22,23,24,25,26,27,28,29,30]).

Based on the literature review, the aim of the study was to select the SNPs in the genes encoding MMP2, MMP3, MMP9, MMP13, MMP16, and MMP20, which had been previously associated with dental caries in other populations [19,20,21,22, 26,27,28,29], and to determine the genotypes of these SNPs in Czech children with primary/permanent dentitions. The null hypothesis is that there is no association between the selected SNPs and dental caries development in both dentitions in our population.

Methods

Design of study

This case-control genetic association study was conducted in the period from 2005 to 2018.

All of the procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

Characteristics of participants and sampling

Two groups of children from the South Moravia region of the Czech Republic were selected according to their dentition - group 1: preschool children with primary dentition, and group 2: children with permanent dentition, all of whom were recruited from the European Longitudinal Study of Pregnancy and Childhood (ELSPAC) [31].

The inclusion criteria for group 1 were: at least 16 primary teeth, general good health, and the willingness of the parents to enter their children in the study. The exclusion criteria for group 1 were: the presence of one or more permanent teeth, a familial relationship between children, and ethnicity other than Caucasian Czech. The inclusion criteria for group 2 were: age 13–15 years, general good health, and the willingness of the parents to enter their children in the study [32]. The exclusion criteria for group 2 were: previous or concomitant therapy with orthodontic appliances, a familial relationship between children, and ethnicity other than Caucasian Czech.

The children included in group 1 were recruited from the out-patients’ department of Paediatric Dentistry, University Hospital Brno, and the Paediatric Department of the Clinic of Stomatology, St. Anne’s Faculty Hospital in Brno, where they were sent for a preventive examination (healthy children) or complex treatment under general anaesthesia (children who were unable to undergo standard dental treatment due to their uncooperativeness and the need for multiple restorations and extractions) in the period 2016–2018. Oral examinations were performed by two mutually calibrated experienced paediatric dentists under standard conditions (using a dental probe and mirror after drying, and in a good light) in a professional dental unit. The dmft index was calculated using dental caries (D3 level) as a cut-off point for the detection of decay [32, 33].

Children selected from the ELSPAC study (group 2) underwent dental examinations at the Clinic of Stomatology, St. Anne’s University Hospital, in the period 2005–2007. To determine the DMFT index for each child the teeth were first dried and then examined in a good light, all present teeth were examined in the dentist’s chair using a mirror and a dental probe. The data was entered into a standard medical record. A radiograph examination was not performed as it was not part of the routine dental care for these adolescents and would therefore be deemed unethical. The clinical assessment was carried out by one investigator using the cavitation of the lesion as the detection threshold of caries according to the criteria given in the WHO Oral Health Surveys as described previously [34].

To minimize inter-examiner variability in the classification of carious lesions, the participating dentists were trained and calibrated in accurate dmft/DMFT (decayed/missing/filled teeth in primary/permanent dentition) charting. Blood samples from children with early childhood caries (ECC) and samples of buccal epithelial cells from the caries-free children included in group 1, and all of the children from group 2 were collected. The DNA was isolated using the Ultra-Clean®BloodSpin® DNA Isolation Kit (Mo Bio Laboratories, Inc., Carlsbad, CA, USA).

Genetic analysis

The candidate genes encoding MMPs and their specific variants were selected based on associations described previously in other populations, proven functional effects, and/or a minor allele frequency (MAF) higher than 0.1 in the population studied. Determinations of the nine MMPs polymorphisms (rs2287074, rs243865, rs679620, rs17576, rs2252070, rs2046315, rs10429371, rs1711437, rs1784418) were based on the polymerase chain reaction using 5′ nuclease TaqMan® assays (C___3225956_10, C___3225943_10, C___3047717_1_, C__11655953_10, C__25474083_10, C__11189892_10, C__30078580_10, C___2158805_20, C___7492661_10, respectively). The reaction mixture and conditions were designed according to the manufacturer’s instructions (Thermo Fisher Scientific, Waltham, MA, USA), and fluorescence was measured using the ABI PRISM 7000 Sequence Detection System. SDS version 1.2.3 software was used to analyze real-time and endpoint fluorescence data.

Statistical analysis

All statistical analyses were performed using the program package Statistica v. 13.0 (StatSoft, Inc., Tulsa, OK, USA). The Fisher-exact test was used for testing the differences in the allele frequencies, and the chi-square test was used (χ2) for calculating the Hardy-Weinberg equilibrium (HWE) and the differences in the genotype frequencies between the cases and controls in each group. Only values of P below 0.05 were considered statistically significant. The Bonferroni correction was used to adjust the level according to the number of independent comparisons to the overall value of 0.05.

Results

In total, 782 generally healthy Czech children were included in this study. Group 1 was comprised of 101 children with ECC (dmft ≥ 1) aged 3.51 ± 0.88 years (mean ± standard deviation), 59 boys and 42 girls and 52 caries-free children with primary dentition (dmft = 0) aged 3.92 ± 1.04 years, there were 24 boys and 28 girls, (P > 0.05 both for age and gender distributions). Group 2 consisted of 474 subjects with dental caries (DMFT ≥ 1), 253 boys and 221 girls, and 155 caries-free children with permanent dentition (DMFT = 0), 83 boys and 72 girls, all aged 13–15 years, (P > 0.05 both for age and gender distributions). Because the dmft/DMFT indexes were calculated using dental caries (D3 level), i.e. cavitated lesions as a cut-off point for the detection of decay, their kappa scores were above 0.95.

The genotype frequencies of all nine studied MMPs SNPs were in the HWE in both groups of caries-free children (dmft = 0 and DMFT = 0, P > 0.05). There were no significant differences in the allele or genotype frequencies of any of the studied MMPs SNPs among the children with dental caries in the primary/permanent dentitions and the healthy controls of the corresponding age group (P > 0.05). In addition, similar allele or genotype frequencies of the studied MMPs SNPs were found in the children with severe dental caries in permanent teeth (111 children with DMFT ≥ 6) and the healthy controls (DMFT = 0) (P > 0.05, see Table 1).

Table 1 Genotype frequencies of MMPs SNPs in Czech children according to their caries experience

The MAF of all of the nine studied MMPs SNPs were similar in the European population (EUR, N = 1006, data obtained from NCBI database) and the Czech population (P > 0.05, see Table 2). The highest difference in MAFs was present in MMP16 SNP (rs2046315) (6.4% between EUR population and Czech children with dmft = 0). In contrast to the EUR population, the MAFs of specific MMPs SNPs in Bulgarians, Turks, Brazilians, Chinese, and Saudi Arabians are more or less frequent (difference to 22.7%). Also, the allele distribution of MMP20 (rs1784418) in Polish Caucasians differs in frequency from the EUR population (difference to 7.6%), while similar frequencies were found in both MMP16 SNPs (rs2046315 and rs10429371) in COHRA1, including Caucasian northern Appalachian families and the EUR population, see Table 2.

Table 2 MMPs SNPs in caries-free controls from this study and other caries-free controls in different populations

Discussion

The progression of carious lesions differs between the primary and permanent dentitions as a result of the different anatomical and morphological characteristics. Wang et al. [35] suggested that the susceptibility to the development of dental caries in the primary dentition has a different genetic background than in permanent dentition.

Host-derived MMPs can originate both from saliva and dentin, and are activated in an acid environment, thus they are able to digest the demineralized dentin matrix. Human MMP2, MMP9, and MMP8 (collagenase 2) were identified in demineralized dentinal lesions [9]; MMP3 was also present in human dentine [36]. The odontoblasts, the main cellular source of MMP20 in the dentin-pulp complex, secrete this enzyme into the dentinal fluid [37]. The MMPs levels can be influenced by many factors, such as growth factors, cytokines, and hormones (oestrogen), as well as gene variability leading to changes in their gene expression and/or protein functions. Therefore, this study focused on variants in the MMPs genes and their possible role in the pathogenesis of dental caries in primary and permanent dentitions.

Raivisto et al. [30] studied several SNPs in the genes encoding MMP2, MMP3, MMP8, MMP9, and MMP13, and reported no association with dental caries or initial carious lesions in 94 Finnish adults. The results of our multigene SNPs analysis in a larger population sample (625 Czech children with permanent teeth) are in line with their findings. In Czech preschool children with primary dentition, the selected MMPs SNPs were not associated with dental caries either.

Price et al. [38] suggested that common MMP2 SNP (rs243865) located in the CCACC box of the Sp1-binding site influences its gene transcription, thus this variant is a candidate for further studies of pathological processes. Although the frequencies of the AA genotype MMP2 SNP (rs2287074) were previously found significantly higher in Bulgarian students with low caries experience (DMFT from 1 to 4) than in caries-free subjects (DMFT = 0), the size of the studied sample was small (41 vs. 20 subjects, respectively) [19]. Apart from the findings in the study by Karayasheva et al. [19], no other MMP2 gene variants (rs243847 and rs243865) were associated with dental caries [20,21,22], which is in accordance with our results.

Controversial results have been recorded in MMP3 SNP (rs679620) and its relation to dental caries. A Brazilian study which dealt with this variant in a large cohort of children with primary dentition did not find any association with dental caries [22], similar to the afore-mentioned Finnish study [30]. While Bulgarian students with the CC genotype suffered significantly more frequently from dental caries (DMFT ≥ 1), CC genotype frequencies between caries-free adults and the group of patients with high caries experience in permanent dentition (DMFT ≥ 5) were the same [19]. However, the authors stated that the presence of the CC genotype decreased the risk of developing a high number of caries by about four times [19]. We determined similar allele and genotype frequencies between the studied groups of Czech children, even in comparison with extreme phenotypes (caries-free subjects vs. children with high caries experience DMFT ≥ 6).

The GG genotype of MMP9 SNP (rs17576) has previously been associated with a lower risk of dental caries in the primary dentition [22]. In the multivariate analysis, the AA genotype was found to be a risk factor for dental caries when the variable defining dental status was comprised from the dmft index and white spot lesion (WSL) together, but not separately [22]. MMP9 and MMP13 SNPs (rs17576 and rs2252070, respectively) were monitored in studies by Tannure et al. [20] and Alyousef et al. [21]. The same conclusion about the negative association with dental caries was reached in cases of MMP9 variants, in agreement with our results. However, in the case of MMP13 SNP there is a discrepancy in the hypothesised functional importance [39]. The CC genotype decreased the risk of dental caries in Brazilians aged 3–21 years [20]. However, another Brazilian study involving 10–12 year old children found no association between this MMP13 SNP (rs2252070) and dental caries [23]. Moreover, the distributions of the alleles and genotypes of MMP13 SNP (rs2252070) were similar between the cases and controls in children aged 5–13 years from Saudi Arabia [21], and in both groups of Czech children. Additionally, no significant differences were found recently in the alleles or genotypes of MMP13 between 12 and 15 year old children with and without dental caries in China [24].

In total, 889 children and 2698 adults from different cohorts were involved in the genome-wide association study by Lewis et al. [25] Almost 30 genetic variants spanning the MMP10, MMP14, and MMP16 genes were investigated. Only MMP16 SNPs (rs2046315 and rs10429371) were significantly associated with dental caries in an individual sample of Caucasian adults, and via meta-analysis across 8 adult samples after gene-wise adjustment for multiple comparisons [25]. In contrast, no differences were observed in the allele or genotype frequencies according to caries status between Czech children with primary and permanent dentitions.

Antunes et al. [22] associated MMP20 SNP (rs1711437) with the presence of WSL, but not with the dmft index, in a cohort of 786 children aged from 2 to 6 years in Brazil. Our results are largely in agreement with these findings, however, we did not evaluate the WSL. The meta-analysis by Filho et al. [28] showed the association of MMP20 SNP (rs1784418) with dental caries in the primary dentition only for Brazilians and not for the Turkish population. However, Vasconcelos et al. [23] found no association between this SNP and dental caries of mixed dentition in Brazilian children. In line with the study by Gerreth et al. [29], which included 96 Polish children aged 20–42 months, MMP20 SNP (rs1784418) was not associated with dental caries in the primary dentition in Czech children.

There are some limitations to our study, such as the risk of false-negative results in a case-control designed study with a relatively small number of caries-free preschool children, as well as no determination of MMPs mRNA or protein levels. On the other hand, this is the first study to analyse several MMPs polymorphisms in relation to both dmft and DMFT scores in a European Caucasian population. Minor allele frequencies of all studied MMPs SNPs in generally healthy and caries-free Czech children are in concordance with data referred to in the NCBI for the European population (EUR) (see Table 2). The EUR population mentioned in Table 2 is from the 1000 Genomes Project super population [40] and includes Utah Residents (CEPH) with Northern and Western European Ancestry (CEU), the Toscani in Italia (TSI), the Finnish in Finland (FIN), the British in England and Scotland (GBR) and the Iberian Population in Spain (IBS). An explanation of the discrepancies between our findings and other non-Caucasian studies may probably be due to the interpopulation heterogeneity. The allele and genotype frequencies were compared within each group between the cases and controls, therefore, there is no bias in the statistical evaluation according to the different periods of the subject recruitment.

Although MMPs are considered as candidate genes for dental caries, we assume that individual variants have a small effect on it and a complex research approach to this multifactorial disease is preferable. Further research in larger populations with different ethnic backgrounds should be carried out before the exclusion of these MMPs SNPs as risk factors in the pathogenesis of dental caries.

Conclusions

In conclusion, the genotypes in selected MMPs SNPs in Czech children were determined and this study demonstrated the lack of association between the selected MMPs gene variants and the susceptibility to or severity of dental caries in both primary and permanent dentitions in the Czech population.

Abbreviations

dmft/DMFT:

Decayed/missing/filled teeth in primary/permanent dentition

ECC:

Early childhood caries

ELSPAC :

European Longitudinal Study of Pregnancy and Childhood

EUR:

European population

MAF:

Minor allele frequency

MMP:

Matrix metalloproteinase

SNP:

Single nucleotide polymorphism

WSL:

White spot lesion

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Acknowledgements

We would like to thank our colleagues, who helped us with samples collection: Kristina Musilova, Lenka Zackova, Michaela Bartosova, Lubomir Kukla, Dominika Hulova, Margarita Rousi, Zuzana Zidekova, Denisa Kavrikova, Zdenek Linhart, and student (laboratory technician) Patricie Kudelova.

Competing interests

The authors declare that they have no competing interests.

Funding

The study was supported by Ministry of Health of the Czech Republic, grant nr. NV17-30439A, the project MUNI/A/1428/2019, Recetox RI (CZ.02.1.01/0.0/0.0/16_013/0001761) and funds from the Faculty of Medicine of Masaryk University awarded to junior researcher Petra Borilova Linhartova. All rights reserved.

Availability of data and materials

The datasets used and/or analysed during the current study are available from the corresponding author upon reasonable request.

Authors’ contributions

Conceptualization, P.B.L., M.K. and L.I.H.; methodology, P.B.L. and M.K.; laboratory analysis, T.D.; data analysis, L.I.H.; writing—original draft preparation, P.B.L.; writing—review and editing T.D., M.K., and L.I.H.; visualization, P.B.L.; project administration, P.B.L. and L.I.H.; funding acquisition, P.B.L. and L.I.H. All authors have read and agreed to the published version of the manuscript.

Consent for publication

Not applicable.

Ethics approval and consent to participate

This study was approved by the Committee for Ethics of the Faculty of Medicine, Masaryk University, Brno (3/2004, from March 30, 2004) and St. Anne’s Faculty Hospital (without number, from April 13, 2004, and 1G/2017). Written informed consent was obtained from all parents or legal guardians of the children prior to their inclusion in the study in line with the Declaration of Helsinki.

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Correspondence to Lydie Izakovicova Holla.

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Borilova Linhartova, P., Deissova, T., Kukletova, M. et al. Matrix metalloproteinases gene variants and dental caries in Czech children. BMC Oral Health 20, 138 (2020). https://doi.org/10.1186/s12903-020-01130-6

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Keywords

  • Polymorphism
  • Association study
  • Caries
  • Oral disease
  • Genetic predisposition
  • ELSPAC