Risk factors involved in orofacial cleft predisposition - review

Risk Factors for Nonsyndromic Orofacial Clefts Among Saudi Children

OBJECTIVES

The aim of this study was to identify the risk factors associated with nonsyndromic orofacial clefts (NSOFCs) among Saudi children.

MATERIALS AND METHODS

A case-control study was carried out at the Ministry of National Guard Health Affairs. Cases were children with NSOFCs who were matched by gender and year of birth to healthy controls from the same setting. Data on risk factors were collected by interviewing parents of both cases and controls using a validated questionnaire. The questionnaire consisted of the father's and mother's information and the child's information. The level of significance was set at 0.05. Odds ratio (OR) and 95% confidence intervals (CIs) were used to determine the associated risk factors with NSOFCs.

RESULTS

A total of 188 children were included (88 cases and 100 controls), with a mean age of 5.1 ± 2.3 years. Maternal fever during pregnancy was associated with a significantly higher risk of NSOFCs (OR = 3.4, 95% CI: 0.05-2.5, p < 0.05). Additionally, the presence of maternal relatives with orofacial clefts increased the risk (OR = 6.02, 95% CI: 0.43-3.16, p < 0.001), whereas the strongest predictor was paternal relatives with orofacial clefts (OR = 8.00, 95% CI: 0.41-3.75, p = 0.014). These findings are of utmost importance for the understanding and potential prevention of NSOFCs.

CONCLUSIONS

The presence of paternal or maternal relatives with orofacial clefts and maternal fever during the first trimester were predictors for NSOFCs, with having affected paternal relatives being the strongest predictor.

Neurodevelopmental disorders in children with cleft lip and palate: a systematic review

Individuals with orofacial clefts (OFCs) may be at an increased risk of developing autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD). This systematic review provides a summary of the most recent data regarding the prevalence of ASD and ADHD in the OFC population and compares this to the general paediatric population. Multiple databases were searched including PubMed/Medline and Embase in July 2024, following the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines and was registered in PROSPERO (CRD42024565219). 1025 papers were identified for screening, of which nine were included in the report. Percentage prevalence was calculated and compared to global prevalence or control populations where available. Overall, ASD prevalence among children with a cleft ranged from 0 to 50% (Mean = 2.87%; SD = 5.40) compared to ~ 1% globally (WHO) and ADHD prevalence ranged from 2.34 to 31.71% (Mean = 3.63%; SD = 4.30) compared to ~ 5% globally (NICE). Matched control populations showed larger differences. Isolated cleft palate was associated with higher rates than isolated cleft lip or combined cleft lip and palate. Prevalence in individuals with syndromic clefts appeared greater still (Mean = 14.80%; SD = 16.58) although populations were small. Children with OFCs demonstrate increased prevalence of ASD compared to the average paediatric population. Evidence for increased prevalence of ADHD is less clear, with varying rates across studies. Children with isolated cleft palate or cleft associated with genetic syndromes appear most at risk, although further research is needed.

Orofacial Cleft and Its Association with Consanguineous Marriage and Other Risk Factors: A Case-control Study from a Tertiary Care Hospital in Jammu Province

Background

Orofacial cleft is among the most common craniofacial malformations. It presents a complex and multifactorial etiology that involves genetic and environmental factors. One of the etiological factors is consanguinity (marriage between blood relatives). Multiple environmental risk factors, such as advanced maternal age, parity, maternal smoking, radiation, alcohol consumption, diabetes mellitus, and maternal use of drugs (i.e., anticonvulsants), folic acid deficiency, etc., have also been linked to the development of cleft lip and/or palate (CL/P). There is a dearth of literature reporting the occurrence of cleft due to consanguinity and other risk factors.

Aim

The aim of this study is to describe the orofacial cleft demographics and to determine the influence of parental consanguinity and other associated risk factors on the occurrence of orofacial clefts (OFC) at a tertiary healthcare hospital in Jammu Province.

Materials and methods

This was a hospital-based case-control study. In the present study, data collection was specifically done regarding demographic features, history of consanguinity, degree of consanguinity, and other associated maternal risk factors in both the cleft and control groups.

Result

This study elucidates a significant association between parental consanguinity, degree of consanguinity, and other associated risk factors (i.e., maternal age ≥30 years, birth order ≥3, maternal smoking, alcohol consumption, and lack of folic acid consumption) with the occurrence of OFC.

Conclusion

Prevention is better than cure. Awareness programs and appropriate counseling should be conducted to educate the community about the risk factors and the anticipated genetic consequences of consanguinity to prevent the development of cleft anomalies in such populations.

How to cite this article

Gupta A, Kaul B, Gulbar S, et al. Orofacial Cleft and Its Association with Consanguineous Marriage and Other Risk Factors: A Case-control Study from a Tertiary Care Hospital in Jammu Province. Int J Clin Pediatr Dent 2024;17(11):1258-1264.

Orofacial Clefts and Maternal Risk Factors: A Population-Based Case-Control Study

BACKGROUND/OBJECTIVES

Orofacial clefts (OFCs) are some of the most common congenital anomalies worldwide. The aim of this case-control study was to evaluate the association of OFCs with selected maternal characteristics.

METHODS

Data on isolated non-syndromic cases of OFCs were extracted from the population-based registry of congenital anomalies of Tuscany. A sample of live-born infants without any congenital anomaly was used as the control group. We investigated the association with sex and some maternal characteristics: age, body mass index, smoking, and education. Adjusted odds ratios (OR) were calculated using a logistic regression model. Analyses were performed for the total OFCs and separately for cleft lip (CL) and cleft palate (CP).

RESULTS

Data on 219 cases and 37,988 controls were analyzed. A higher proportion of males (57.9%) was observed, particularly for CL. A decreasing trend among the maternal age classes was observed (OR:0.81 (95%CI 0.70-0.94)). Underweight mothers had a higher prevalence of OFCs, in particular for CL (OR:1.88 (95%CI 1.08-3.26)).

CONCLUSIONS

We found an association of OFCs with lower maternal age. The association with maternal age remains controversial and further epidemiological evidence is needed through multicenter studies. We observed that CL was more common in underweight mothers, suggesting actions of primary prevention.

Diagnostic Methods for the Prenatal Detection of Cleft Lip and Palate: A Systematic Review

Background: Accurate prenatal diagnosis of cleft lip and palate is essential to discuss severity prediction, perform appropriate parental counseling, and, at last, establish long-term treatment planning. The aim of this systematic review was to analyze the accuracy of various imaging techniques for the prenatal diagnosis of cleft lip and palate, assess the pregnancy phase for orofacial clefts diagnosis, and study the different cleft types in terms of diagnostic methods, timing, and predictability. Methods: A search of the PubMed, EMBASE, Scopus, and Web of Science databases was conducted to identify potentially relevant studies published until January 2024. The quality of the selected articles was assessed using the Newcastle-Ottawa scale for methodological quality assessment of cohort studies and the QUADAS-2 scale for diagnostic test studies. Results: A total of 18 studies met the eligibility criteria and were included in the review. The findings of this review indicate that the majority of studies showed improved diagnostic accuracy when supplementary techniques, such as 3D ultrasound or magnetic resonance imaging, were added to 2D ultrasound. Conclusions: The implementation of magnetic resonance imaging as a standard procedure could significantly improve the precision of diagnosing cleft lip and palate. Therefore, the diagnostic technique used will play a crucial role in the accuracy of the diagnosis.

Salivary microbiome and asthma risk in children with orofacial defects

BACKGROUND

Patients with congenital orofacial defects, cleft lip (CL), cleft palate (CP), and cleft lip and palate (CLP) have continuous exposure of the respiratory system to the microbiome from the oral environment, offering opportunities to develop mucosal immunity in the airway. This two-part study aims to analyze data on asthma occurrence in CL, CP, and CLP infants and the composition of the salivary microbiome, and to evaluate the oral microbiota and its association with the risk of developing childhood asthma.

METHODS

Patient data from the research database of Chang Gung Memorial Hospital from 2004 to 2015 were retrospectively analyzed by multivariable regression. Diseases diagnoses were defined by ICD codes. Asthma must also meet the criteria for receiving selective β2 agonistic or/and inhaled corticosteroid treatments twice within 1 year. Analysis of the saliva microbiome was performed prospectively from 2016 to 2020 in 10 healthy term infants and 10 CLP infants on postnatal 7th day, 1 month, and 6 months by next-generation sequencing.

RESULTS

Asthma and nonasthma groups included 988 and 3952 patients, respectively. The incidence of asthma development was higher in patients with CP than in CL and CLP groups (aOR: 5.644, CI: 1.423-22.376). The species composition of the microbiome at 1 and 6 months was significantly different between infants with CLP and healthy infants.

CONCLUSION

Children with orofacial defects have a higher risk of developing asthma with a possible contribution from oral microbiota in the early months of life.

Characterization of 554 Mexican Patients With Nonsyndromic Cleft Lip and Palate: Descriptive Study

Orofacial clefts are one of the most common birth defects and the most common craniofacial malformation worldwide. The most common orofacial clefts (OFCs) are congenital cleft lip with or without cleft palate (CL ± P) and isolated cleft palate (CP). The incidence of OFCs varies depending on region and ethnicity; however, it affects approximately 1 in 600 newborns worldwide. In most cases, CL ± P and CP are multifactorial congenital malformations, where both exogenous and genetic factors play an important role. The objective of this study was to describe the frequency of potential risk factors associated with the development of CL ± P and CP in Mexican population. Patients were referred for multisystemic treatment, from private and public institutions in different regions of the country (center, north, and south). Sociodemographic information, prenatal and parental history were obtained through direct interviews with the patients or the patients' mothers in the case of underaged patients. Referred patients were invited to participate in the study. No interventions were applied for this study. The relationship between these factors and the prevalence of CL ± P and CP was studied. A total of 554 patients were included, the majority with CLP (30% to 7%), statistically significant differences were found for folic acid ( P = 0.02) consumption. Familial aggregation did not reach statistical significance for first-degree family members ( P = 0.34) but was significant for second-degree family members ( P = 0.007). More risk factors associated with CL ± P and CP may still be unknown, prompting more epidemiological research and research in other little-studied areas, such as; specific genetic factors in Mexican population.

Environmental tobacco smoke exposure and non-syndromic orofacial cleft: Systematic review and meta-analysis

INTRODUCTION

Environmental tobacco smoke (ETS) is associated with several congenital anomalies, including non-syndromic orofacial clefts (NSOFCs). This systematic review aimed to update the literature on the association between ETS and NSOFCs.

METHODS

Four databases were searched up to March 2022, and studies that evaluated the association between ETS and NSOFCs were selected. Two authors selected the studies, extracted the data, and evaluated the risk of bias. Comparing the association of maternal exposure to ETS and active parental smoking with NSOFCs allowed for the creation of pooled effect estimates for the included studies.

RESULTS

Twenty-six studies were deemed eligible for this review, of which 14 were reported in a previous systematic review. Twenty five were case-control studies, and one was a cohort study. In total, these studies included 2142 NSOFC cases compared to 118129 controls. All meta-analyses showed an association between ETS and the risk of having a child with NSOFC, based on the cleft phenotype, risk of bias, and year of publication, with a pooled increased odds ratio of 1.80 (95% CI: 1.51-2.15). These studies had a marked heterogeneity, which decreased upon subgrouping based on the recent year of publication and the risk of bias.

CONCLUSIONS

ETS exposure was associated with more than a 1.5-fold increase in the risk of having a child with NSOFC, showing a higher odds ratio than paternal and maternal active smoking.

TRIAL REGISTRATION

The study is registered on the International Prospective Register of Systematic Reviews database # CRD42021272909.

Periconceptional use of vitamin A and the risk of giving birth to a child with nonsyndromic orofacial clefts-A meta-analysis

BACKGROUND

We conducted a meta-analysis of observational epidemiological studies to evaluate the association between periconceptional use of vitamin A and the risk of giving birth to a child with nonsyndromic orofacial clefts (NSOFCs).

METHODS

We carried out a systematic literature search of Embase, PubMed, Web of Science, Google Scholar, and OpenGrey from inception to June 30, 2021. Two reviewers independently evaluated the studies that met the inclusion criteria and filled out an abstraction form for each study. Study quality was assessed using the Newcastle-Ottawa Assessment Scale (NOS). Adjusted estimates were pooled with an inverse variance weighting using a random-effects model. Heterogeneity and publication bias were assessed using the Cochran's Q test and funnel plot, respectively.

RESULTS

A total of six case-control studies with moderate risk of bias were included. The pooled OR showed a 20% reduction in the risk of NSOFCs for periconceptional use of vitamin A which was not statistically significant (OR = .80; 95% CI .54-1.17, p = .25). For nonsyndromic cleft lip with or without cleft palate (NSCL/P), the studies were homogenous, and the pooled estimate showed a 13% risk reduction, which was significant (OR = .87; 95% CI .77-.99, p = .03). For nonsyndromic cleft palate only (NSCPO), the pooled estimate showed a 33% lower likelihood, which was not statistically significant (OR = .67; 95% CI .42-1.08, p = .10).

CONCLUSION

Our results suggest a possible protective effect for the periconceptional use of vitamin A on the risk of NSCL/P. This finding should be investigated further in prospective studies across multiple populations.

The characteristics and perioperative outcomes of children with orofacial clefts managed at an academic hospital in Johannesburg, South Africa

Background

Orofacial clefts (OFCs) are the commonest congenital anomalies of the head and neck. Their aetiology is multifactorial, and prevalence has a geographical variation. This study sought to describe OFC cases that presented for surgery.

Objectives

The study aimed to describe the preoperative characteristics, concomitant congenital anomalies and perioperative outcomes of children presenting for cleft repair surgery over a 5-year period at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH).

Methods

A retrospective descriptive record review for children under the age of 14 years who presented for cleft repair surgery at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH) during a 5-year period, from 1 January 2014 to 31 December 2018. Descriptive and comparative statistics were used to report the results.

Results

A total of 175 records were included in the study. The median (IQR) age was 11 (6—27) months, with a predominance of males 98 (56%). Most of the children had cleft lip and palate (CLP) 71(41%). The prevalence of concomitant congenital anomalies was 22%, emanating mostly from head and neck congenital anomalies. Nine syndromes were identified in 15 children with syndromic clefts. Twenty-nine percent of children were underweight for age. There were 25 anaesthetic related complications, commonly airway related. Six children with complex multiple congenital anomalies were admitted in the intensive care unit postoperatively. No mortalities were recorded.

Conclusion

Majority of children with orofacial clefts underwent cleft repair surgery without serious complications and intensive care unit admission. Only six children were diagnosed with significant anomalies needing intensive care management.

Biomechanical behavior of an alveolar graft under maxillary therapies

Cleft lip and palate is a congenital defect that affects the oral cavity. Depending on its severity, alveolar graft surgery and maxillary orthopedic therapies must be carried out as a part of the treatment. It is widely accepted that the therapies should be performed before grafting. Nevertheless, some authors have suggested that mechanical stimuli such as those from the maxillary therapies could improve the success rate of the graft. The aim of this study is to computationally determine the effect of maxillary therapies loads on the biomechanical response of an alveolar graft with different degrees of ossification. We also explore how the transverse width of the cleft affects the graft behavior and compare results with a non-cleft skull. Results suggest that stresses increase within the graft as it ossifies and are greater if maxillary expansion therapy is applied. This has consequences in the bone remodeling processes that are necessary for the graft osseointegration. Maxillary orthopedic therapies after graft surgery could be considered as a part of the treatment since they seem to act as a positive extra stimulus that can benefit the graft.

Seasonal Influence on the Numbers of Gender-Related Orofacial Cleft Conceptions in the Netherlands

BACKGROUND

In the multifactorial etiology of orofacial clefts (OFCs), environmental factors play an important role. To trace the influence of these factors, the timing of the cell biological mechanisms that occur during embryological development of the primary and secondary palates must be taken into account. That is, the fusion process of the facial and palatal processes, respectively, followed by their differentiation into bone and musculature, which take place during the first trimester of pregnancy. During this period, harmful seasonal influences such as viral infections and vitamin deficiencies could induce OFC in the embryo.

AIMS

The aim of this study is to find out whether a seasonal conception period with an increased risk of OFC development exists, particularly gender related.

METHODS

This was a retrospective cross-sectional study on children with OFC born in the Netherlands from 2006 to 2016. Total conception rates of live births in the Netherlands were used as a control group. χ² tests were performed to analyze monthly and seasonal differences. Males and females, positive and negative family history and subphenotype groups based on fusion and/or differentiation (F- and/or D-) defects, and their timing in embryogenesis were analyzed separately.

RESULTS

In total, 1653 children with OFC, 1041 males and 612 females, were analyzed. Only males with FD-defects showed a significant seasonal variation with an increase in conceptions during spring, most often in May.

CONCLUSIONS

Males with FD-defects showed a significant seasonal variation with an increase in conceptions during spring. No other seasonal trends could be demonstrated.

A comprehensive analysis of AHRR gene as a candidate for cleft lip with or without cleft palate

Cleft lip and palate (CL/P) is among the most common congenital malformations and affects 1 in 700 newborns. CL/P is caused by genetic and environmental factors (maternal smoking, alcohol or drug use and others). Many genes and loci were associated with cleft lip/palate but the amount of heterogeneity justifies identifying new causal genes and variants. AHRR (Aryl-Hydrocarbon Receptor Repressor) gene has recently been related to CL/P however, few functional studies analyze the genotypephenotype interaction of AHRR with CL/P. Several studies associate the molecular pathway of AHRR to CL/P which indicates this gene as a functional candidate in CL/P etiology.

METHODS

Systematic Literature Review was performed using PUBMED database with the keywords cleft lip, cleft palate, orofacial cleft, AHRR and synonyms. SLR resulted in 37 included articles.

RESULTS

AHRR is a positional and functional candidate gene for CL/P. In silico analysis detected interactions with other genes previously associated to CL/P like ARNT and CYP1A1. AHRR protein regulates cellular toxicity through TCDD mediated AHR pathway. Exposure to TCDD in animal embryos is AHR mediated and lead to cleft palate due to palate fusion failure and post fusion rupture. AHRR regulates cellular growth and differentiation, fundamental to lip and palatogenesis. AHRR decreases carcinogenesis and recently a higher tumor risk has been described in CL/P patients and families. AHRR is also a smoking biomarker due to changed methylation sites found in smokers DNA although folate intake may partially revert these methylation alterations. This corroborates the role of maternal smoking and lack of folate supplementation as risk factors for CL/P.

CONCLUSION

This research identified the importance of AHRR in dioxin response and demonstrated an example of genetic and environmental interaction, indispensable in the development of many complex diseases.

Levels of polycyclic aromatic hydrocarbons in umbilical cord and risk of orofacial clefts

Polycyclic aromatic hydrocarbons (PAHs), which are ubiquitous in the environment, have been found to cause orofacial clefts (OFCs) in mouse model. However, evidence from the human study with markers of intrauterine exposure is absent. We explored the associations between the levels of sixteen PAHs in umbilical cord tissue and risk for OFCs using multivariable logistic models and Bayesian Kernel Machine Regression (BKMR). This case-control study included 89 OFC cases and 129 controls without congenital malformations. Concentrations of PAHs in umbilical cord tissue were detected using gas chromatography coupled to triple quadrupole tandem mass spectrometry. The median levels of ΣPAHs, Σlow molecular weight polycyclic aromatic hydrocarbons, and Σhigh molecular weight polycyclic aromatic hydrocarbons were all higher in cases of total OFCs and its subtypes than in controls, although the differences were not statistically significant. No statistical associations between levels of PAHs in umbilical cord tissue and risk for OFCs were observed in either multivariable logistic models or BKMR models. Maternal using a stove for heating and lower frequency of ventilation in the bedroom/living room, and consumptions of fresh green vegetables were positively correlated with levels of PAHs in umbilical cord. In conclusion, our results did not suggest that in utero exposure to PAHs were associated with the risk for OFCs, in estimating whether single effect of PAHs or joint effects of multiple PAHs.

Therapeutic Review of Methylprednisolone Acetate Intra-Articular Injection in the Management of Osteoarthritis of the Knee - Part 2: Clinical and Procedural Considerations

The use of an intra-articular methylprednisolone acetate (MPA) injection has been shown to have benefits for symptoms of knee osteoarthritis (OA). However, considerations beyond drug efficacy can influence the appropriateness, clinical effectiveness and potential harm of an injection. A review of research evidence and published literature on clinical and procedural factors influencing the effectiveness and safety of a knee injection has been undertaken. Factors include dose, frequency, contraindications, precautions, drug interactions, side-effects, and procedural and patient-related considerations. An evaluation of evidence indicated that a 40 mg dose provides clinical benefit. No strong predictors of response were evident, with the exception of pain severity. Additional benefit for outcomes from higher doses, local anaesthetic, ultrasound guidance or particular anatomical approaches is yet to be demonstrated. Evidence for dose- and duration-related detrimental effects suggests judicious use and frequency. The evaluation showed that there are a number of contraindications and precautions arising from the drug pharmacology, concurrent medications, comorbidities and adverse events which need consideration and monitoring. There was limited safety evidence concerning anticoagulation. The review found that specialist guidance and limited evidence suggests that injection safety concerning warfarin may be enhanced by ensuring that the international normalized ratio level is within therapeutic range. However, the risk-benefit evaluation concerning non vitamin K antagonist oral anticoagulants remains challenging. Although there is published guidance, a lack of clinical studies, safety evidence and reversibility advocates caution. Overall, the review indicates that injection decisions and procedures need an individualized approach and supporting evidence is limited in many areas. Evaluation and discussion of benefits and risks, peri-procedural and post-injection management, and tailoring to the context and individuals' preferences are important in optimizing the benefits and safety of a knee injection.

The functional EGF+61 polymorphism and nonsyndromic oral clefts susceptibility in a Brazilian population

Nonsyndromic oral clefts are considered a problem of public health in Brazil, presenting a multifactorial etiology that involves genetic and environmental components, such as maternal alcohol consumption. Several candidate genes have been investigated to identify some association with nonsyndromic clefts risk. The epidermal growth factor (EGF) gene is implicated in the normal craniofacial development and its functional +61 A>G polymorphism has been related to cancer susceptibility. It has been suggested that cancer and oral clefts may share the same molecular pathways.Objective Our goal was to evaluate the association between the EGF+61 A>G polymorphism and nonsyndromic oral clefts susceptibility.Material and Methods The case-control study included 218 cleft cases and 253 controls from Brazil. The control group was comprised of individuals without congenital malformations, dental anomalies and family history of clefts. The cleft phenotypes and subphenotypes were determined based on clinical examination. Genomic DNA was extracted from oral mucosa cells obtained by mouthwash. The EGF+61 A>G polymorphism genotype was determined by polymerase chain reaction-restriction fragment length polymorphism.Results We noticed the association between maternal alcohol consumption during pregnancy and cleft occurrence. The A allele and AA genotype were over-represented in cleft cases compared with control group when we considered the bilateral cleft lip with or without cleft palate (CL±P) cases, cleft cases with tooth agenesis and cleft cases presenting family history of cleft, but the differences were not statistically significant. Contradictorily, the G allele was higher in cleft palate only (CP) cases than in control group, showing a borderline p value. Comparing the different cleft phenotypes, we observed statistical differences between CP and CL±P cases. Our data suggest the EGF+61 A>G polymorphism was not related with nonsyndromic oral clefts susceptibility in a Brazilian population, but supported the different genetic background between CL±P and CP. Moreover, we confirmed the potential effect of maternal alcohol intake on cleft risk in our population.