Role of estrogen related receptor beta (ESRRB) in DFN35B hearing impairment and dental decay
- Megan L Weber1,
- Hong-Yuan Hsin1,
- Ersan Kalay2,
- Dana Š Brožková3,
- Takehiko Shimizu4,
- Merve Bayram5,
- Kathleen Deeley1,
- Erika C Küchler1,
- Jessalyn Forella1,
- Timothy D Ruff1,
- Vanessa M Trombetta1,
- Regina C Sencak1,
- Michael Hummel1,
- Jessica Briseño-Ruiz1,
- Shankar K Revu1,
- José M Granjeiro6, 7, 8,
- Leonardo S Antunes8,
- Livia A Antunes8,
- Fernanda V Abreu8,
- Marcelo C Costa9,
- Patricia N Tannure10, 11,
- Mine Koruyucu12,
- Asli Patir5,
- Fernando A Poletta13, 14,
- Juan C Mereb15,
- Eduardo E Castilla13, 14,
- Iêda M Orioli16,
- Mary L Marazita1,
- Hongjiao Ouyang1, 17, 18,
- Thottala Jayaraman1,
- Figen Seymen12 and
- Alexandre R Vieira1Email author
© Weber et al.; licensee BioMed Central Ltd. 2014
Received: 3 April 2014
Accepted: 7 July 2014
Published: 15 July 2014
Congenital forms of hearing impairment can be caused by mutations in the estrogen related receptor beta (ESRRB) gene. Our initial linkage studies suggested the ESRRB locus is linked to high caries experience in humans.
We tested for association between the ESRRB locus and dental caries in 1,731 subjects, if ESRRB was expressed in whole saliva, if ESRRB was associated with the microhardness of the dental enamel, and if ESRRB was expressed during enamel development of mice.
Two families with recessive ESRRB mutations and DFNB35 hearing impairment showed more extensive dental destruction by caries. Expression levels of ESRRB in whole saliva samples showed differences depending on sex and dental caries experience.
The common etiology of dental caries and hearing impairment provides a venue to assist in the identification of individuals at risk to either condition and provides options for the development of new caries prevention strategies, if the associated ESRRB genetic variants are correlated with efficacy.
KeywordsDental caries Deafness Dental development Ear development Linkage disequilibrium Genetics Polymorphisms
Dental caries is a major public health problem and is estimated to affect 60 to 90 percent of school children as well as a vast number of adults . Also, data from across the world show that children with hearing disorders suffer from poor oral health [2–12]. Congenital forms of hearing impairment can be caused by mutations in the estrogen related receptor beta (ESRRB) gene [13–16]. ESRRB is located in the 14q24.3 locus, which was linked to dental caries through a genome-wide linkage scan . This is not the first time that hearing loss is associated with alterations of dental structures. Distinct mutations of the dentin sialophosphoprotein gene (DSPP), a gene involved in the initial mineralization of the dentin matrix, are responsible for the clinical manifestations of dentinogenesis imperfecta 1 with or without autosomal dominant progressive high frequency sensorineural hearing loss (DFNA39) . In addition, a case control study of 572 college age musicians showed that ESRRB nonsynomous SNP rs61742642 (P386S) was associated with bilateral notches in their ears and thus suffered from hearing loss due to acoustic overload .
Summary of all individuals analyzed in tests of association, gene expression, and enamel microhardness
Brazilian Rio de Janeiro
Turkish (Enamel Microhardness)
Sample size (mean DMFTa ± SDb)
477 (9.7 ± 7.3)
172 (3.8 ± 4.0)
500 (2.4 ± 3.0)
320 (1.4 ± 2.7)
143 (7.1 ± 7.8)
100 (5.2 ± 3.4)
High caries groupc (mean DMFT ± SD)
298 (13.3 ± 6.7)
92 (7.2 ± 2.3)
171 (5.8 ± 2.6)
53 (6.7 ± 2.8)
66 (13.0 ± 7.9)
63 (7.3 ± 2.5)
Low caries groupc (mean DMFT ± SD)
179 (3.6 ± 2.4)
329 (0.6 ± 0.9)
267 (0.4 ± 0.9)
77 (2.0 ± 2.3)
37 (1.7 ± 1.0)
Age (mean ± SD)
25.8 ± 16.3
5.4 ± 0.8
9.1 ± 3.1
3.5 ± 1.5
21.7 ± 15.6
17.2 ± 3.1
The number of pedigrees
Dental caries and tooth loss information was collected for two consanguineous families (one from Turkey  segregating a seven base pair duplication mutation and one from the Czech Republic  segregating the missense mutation R291L). Families reported on the status of their teeth based on what they were told by their dentist. The detailed reports are presented in Additional file 1: Table S1. Based on these reports, dental caries status was defined as high or low caries experience. These families have recessive hearing impairment due to mutations in ESRRB. It is important to note that the family from Turkey comes from a region of low socioeconomic status with limited access to dental care, whereas the family from the Czech Republic resides in a metropolitan area with better access to dental care. Dental data were collected by phone interview (E.K. in Turkey and D.S.B. in the Czech Republic). Of the 17 family members contacted by E.K., 15 provided information regarding their dental caries experience. D.S.B. was able to obtain information from four family members. Dental caries experience between ESRRB mutation carriers and non-carriers was compared using the Fisher’s exact test.
To study 14q24.3, single nucleotide polymorphisms (SNPs) were selected using data from the International HapMap project on Caucasians and Chinese (http://www.hapmap.org), which were viewed using Haploview . Twenty-five single nucleotide polymorphisms (SNPs) were selected in 14q24.3 for fine-mapping and are listed in Additional file 1: Table S2 based on pairwise linkage disequilibrium and gene structure data. The Graphical Overview of Linkage Disequilibrium (GOLD) software was used to calculate pairwise linkage disequilibrium between the SNPs and help interpret data .
Genotyping was performed using Taqman chemistry end-point analysis. Association between the chosen SNPs and recorded dental caries experience was tested with the transmission disequilibrium test (TDT) implemented in the Family-Based Association Test (FBAT) statistical program . Bonferroni correction was implemented to correct for multiple comparisons and significance was set at 0.002 (0.05/25). Eight SNPs that showed a trend for association with dental caries experience in the Filipino dataset were studied in the additional four population datasets. These eight SNPs were all present within or flanking the ESRRB gene. Data were analyzed using the PLINK software . In order to derive a summary statistic for association with the eight SNPs across populations, a random-effects meta-analysis model was used to estimate the odds ratio for the presence of the associated allele determined by the fine-mapping of the Filipino families. Before pooling the data, we estimated Cochran’s Q statistic, which indicates the degree of heterogeneity. There was no significant evidence of heterogeneity overall (Q = 7.0, p = 0.429). A random-effects model was used because it includes variance components both within and between studies. Moreover, because the random-effects model generally yields a wider confidence interval than a fixed-effects model, the random-effects model is more conservative .
The less common allele of rs17074565 in 13q31.1 was associated with dental caries and was predicted to disrupt a binding site of GR . Lower expression levels of GR in whole saliva are also associated with high dental caries experience . In the Filipino sample, we tested if the eight ESRRB SNPs that showed a trend for association with dental caries also interacted with the SNP rs17074565. We observed the transmission of alleles from parents heterozygous for both the rs17074565 SNP and the ESRRB SNPs to estimate if specific allele combinations were transmitted more often than expected.
All of the exons and exon-intron boundaries of ESRRB were sequenced and compared with the reference sequence transcript ENST00000505752 obtained from Ensembl Genome Browser (http://useast.ensembl.org/index.html). Ninety-three samples from the Turkish cohort were used (62 caries samples and 31 caries free control samples). Primers are listed in Additional file 1: Table S3.
Total RNA isolated from a subset of 94 subjects from the Argentinean population described above was used to test if ESRRB expression can be detected in whole saliva. Subsequent cDNA synthesis from 100 ng of total RNA was accomplished by using High Capacity cDNA Reverse Transcription kit (Applied Biosystems). Primers specific for the three ESRRB isoforms  were tested (ESRRB short, long, and Delta10 isoforms listed in Additional file 1: Table S4); GAPDH was our endogenous control. Quantitative real-time PCR was performed with SYBR Green PCR Master Mix (Applied Biosystems). Quantification of ESRRB expression levels compared to GAPDH was performed by 2-DeltaDeltaCT method . Real-time PCR amplification was performed with an initial denaturation at 95°C for five minutes, 60 cycles at 95°C for 45 seconds, 55°C for 45 seconds, and finally 72°C for 90 seconds in a 7900HT Real-time PCR machine. Real-time results were confirmed by western blotting analysis. ESRRB expression levels were analyzed based on the presence of zero, one, or two copies of lesser common alleles, sex, and dental caries experience. Non-parametric tests were used in all comparisons.
Total RNA from the submaxillary salivary gland epidermoid carcinoma cell line HTB-41™ (American Type Culture Collection) was isolated and studied. cDNA synthesis and real-time PCR conditions used were described above. GAPDH was used as the endogenous control. Amplification of cDNA was performed with SYBR Green PCR Master Mix (Applied Biosystems).
The results of the microhardness testing were compared to the genotyping of DNA extracted from saliva from each of the 100 patients. Results were analyzed using the PLINK software package28. Mean microhardness at baseline, after artificial caries lesion creation, and after fluoride application was calculated. Subjects were divided into two comparison groups: above and below the means. We made comparisons by surface, as well as by using the mean enamel microhardness of all five surfaces combined. A p-value of 0.0004 was considered statistically significant to accommodate for multiple comparisons (Bonferroni correction: 0.05/144).
Expression of Esrrb during enamel development was determined by immunohistochemical analysis of sections of mouse mandibular molars at postnatal day four (secretory stage) and postnatal day eleven (maturation stage).
Two families with DFNB35 hearing loss and ESRRB mutations were contacted for this study, one from Turkey  and the other from the Czech Republic . Of the 17 Turkish DFNB35 family members with a recessive seven base pair duplication in exon 8 of ESRRB (c.1018_1024dupGAGTTTG) and hearing impairment  contacted by phone interview, 15 provided information regarding their dental caries experience (Figure 2). The ten members of the family who are carriers for the ESRRB mutation (six homozygous, four heterozygous) have severe dental caries, with many if not all teeth affected by caries. Three of the five individuals without ESRRB mutations were caries free, and two of the five had low caries experience (Fisher’s exact test, p = 0.02). The DFNB35 family from the Czech Republic has a recessive missense mutation (R291L) in ESRRB and hearing impairment. Both the mother of the affected child and the mother’s father had high dental caries experience. The affected four-year-old child is caries-free in his primary dentition, and his father is apparently affected by periodontal disease. It was not possible to define the father’s dental caries status.
Statistical evidence of interaction between rs17074565 (a SNP predicted to disrupt a GR binding site) and ESRRB SNPs in dental caries in Filipinos
ESRRBSNP interacting with rs17074565
Number of informative families
From the sequencing of ESRRB exons and exon-intron boundaries, SNPs rs10132091, rs61742642, rs3813545, rs3829784, rs45533334, rs35544003, rs2361292, and rs55835922 were found in our samples. There is no evidence indicating these SNPs are disease-causing variants. No mutations causing hearing impairment were found. Individuals with dental caries have an over-representation of the T allele of rs55835922 (74% versus 54%; p = 0.01). The SNP rs61742642 is a missense mutation (P386S), but its frequency was just slightly elevated in cases with dental caries (13% versus 9.5%). SNP rs35544003 is a synonymous change not thought to have any detrimental effect. Detailed sequencing results are listed in Additional file 1: Table S9.
Only expression of the short ESRRB isoform listed in Additional file 1: Table S4 was detected, both by real time PCR and western blot analyses (Additional file 1: Figure S9). Additionally, expression of the short ESRRB isoform was detected in the submaxillary salivary gland epidermoid carcinoma cell line HTB-41™. The data from the real time PCR experiments indicate that adult females express ESRRB in whole saliva in higher levels than men (p = 0.01). Furthermore, a statistical association was found between ESRRB expression in whole saliva of children and rs745011 allele distribution (p = 0.04). In a dominant model, statistical association was found between ESRRB expression and rs10132091 genotypes (p = 0.03), between low dental caries experience and rs10132091 genotypes (p = 0.05), and between low ESRRB expression in whole saliva of adults and rs6574293 genotypes (p = 0.04). In a recessive model, statistical association was found between low ESRRB expression and rs2860216 genotypes (p = 0.02).
Through experiments that tested the effects of acid dissolution of the enamel surface, we reasoned that ESRRB variants contributes to formation of an enamel structure that is more susceptible to the acidic effects involved in the initiation of dental caries. Distribution of alleles of SNP rs4903419 was different between subjects with harder and softer enamel at baseline under a recessive model (The G allele was associated with harder enamel, p = 0.0007). Also, the distribution of alleles of SNP rs6574293 was different when enamel microhardness at the distal surface was compared after the creation of an artificial caries lesion and after fluoride application (The A allele was associated with harder enamel after fluoride application, p = 0.0006). Complete results are summarized in Additional file 1: Table S10.
Immunohistochemical stain with rabbit polyclonal antibody, demonstrated that Esrrb is expressed by mouse ameloblasts, the cells that deposit tooth enamel, during the secretory stage of amelogenesis in mice (postnatal day four, Additional file 1: Figure S10), but not during the later maturation stage of dental development, such as postnatal day eleven.
Mice that are Esrrb-deficient, or which have a conditional knockout of the Esrrb gene, exhibit head-tossing, head-bobbing, and running in circles caused by inner-ear defects [34, 35]. In humans, the ESRRB autosomal recessive hearing impairment indicates that ESRRB is essential for inner-ear development [13–16]. We showed that SNPs in the ESRRB locus are also associated with dental caries experience in multiple populations, but particular populations are less influenced by factors that protect against the disease. Results were clearer when we removed the “healthier” groups from the pooled analysis (Figure 5), leaving the ones with limited access to dental care, similar cultural and social behaviors, and sub-optimal exposure to fluoridated drinking water. When we evaluated dental caries in two families with previously described hearing impairment and ESRRB mutations, the evidence clearly showed that the severity of dental destruction was much more apparent in mutation carriers. Upon testing the enamel of human teeth in regards to genetic variation in ESRRB, we found evidence that “softer” enamel is associated with ESRRB SNPs.
ESRRB is suggested to repress transcriptional activity mediated by GR, and these two proteins are widely expressed during and after maturation of the mouse and rat cochlea . We previously showed that a SNP in 13q31.1 (rs17074565) was associated with dental caries and potentially disrupts the GR binding site . We found statistical evidence that rs17074565 and ESRRB SNPs are over-transmitted together in families with high dental caries experience.
Both clinical and archeological evidence suggest that women have higher levels of dental caries [36–43], although these differences are not evident when studies are performed in individuals with similar socioeconomic levels and environments [44–46]. The differences are suggested to be the consequence of sex disparities and bias related to the risk factors modulating dental caries . On the other hand, men appear more commonly to have faster hearing deterioration, in part due to the types of occupations that favor males . This evidence is promising in the sense that ESRRB detection in whole saliva can be explored not only in regards to risks of dental caries, but also related to risks of hearing loss related to aging or occupational hazard (i.e., dentists ). The rationale for this suggestion comes from the hypothesis that ESRRB could cause congenital forms of hearing impairment as well as increased susceptibility to the acquired forms of hearing loss. A similar phenomenon happens with diabetes. Data on susceptibility genes and familial clustering for Type 1 and Type 2 Diabetes in humans, mice, and rats suggest the possibility of shared genetic susceptibility to both Type 1 and Type 2 Diabetes in humans [50, 51].
We have demonstrated that informed candidate-gene selection aids in identifying specific variants with a role in complex traits that may be otherwise missed by genome-wide association studies [52–55]. The association of dental caries and hearing impairment provides a venue to assist in the identification of individuals at risk to either condition and provides options for the development of new strategies of prevention for both caries and hearing loss, if the associated ESRRB genetic variants are correlated with efficacy.
ESRRB, a gene when mutated causes a form of hearing impairment, also contributes to dental decay likely by influencing the formation of an enamel surface more susceptible to demineralization under acidic conditions.
The URLs for presented data are as follows:
Ensemble Genome Browser: http://www.ensembl.org/index.html.
HapMap Project: http://hapmap.ncbi.nlm.nih.gov.
UCSC Genome Bioinformatics: http://genomebrowser.ucsc.edu.
We would like to thank the individuals that participated in this study for their support. We would also like to thank Eric Davis and Maggie Saludis for their contributions to the enamel microhardness portion of the study, Paula Noh for helping to optimize primers for sequencing, and Sarah Vinski for administrative support. This research is supported by NIH grants R01-DE018914 and R01-DE016148, and Czech Republic grant IGA MHCZ NT14348.
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