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Updated: Jun 17, 2025
06:07
Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
Published on: August 5, 2022
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DNA Methylation Effects on Van der Woude Syndrome Phenotypic Variability.
Amanda Seaberg1, Waheed Awotoye1, Fang Qian1
1College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA.
Summary
Epigenetic modifications in IRF6 and TP63 genes influence Van der Woude Syndrome (VWS) presentation. DNA methylation patterns in these genes correlate with specific cleft types and severity, explaining VWS phenotypic variability.
Area of Science:
- Genetics and Epigenetics
- Developmental Biology
- Craniofacial Anomalies Research
Background:
- Van der Woude Syndrome (VWS) is characterized by lip pits (LP) and cleft lip/palate (CL/P, CPO).
- Phenotypic variability in VWS suggests a role for epigenetic factors.
- IRF6 and TP63 genes are crucial for palatogenesis and interact in a regulatory loop.
Purpose of the Study:
- To investigate the hypothesis that differential DNA methylation in IRF6 and TP63 regulatory regions contributes to VWS phenotypic discordance.
- To analyze methylation patterns in relation to cleft type and phenotypic severity.
Main Methods:
- DNA methylation analysis of CpG sites in IRF6 and TP63 promoters and an IRF6 enhancer.
- Samples from 78 unrelated VWS cases (blood and saliva) were analyzed.
- Analyses stratified by sex, sample type, cleft type (CL/P±LP vs. CPO±LP), and severity (cleft+LP vs. cleft only).
Main Results:
- Blood samples showed sex-specific differences in IRF6 and TP63 promoter methylation related to cleft type.
- Saliva samples revealed differential IRF6 enhancer and TP63 promoter methylation associated with cleft type.
- Saliva samples indicated higher IRF6 promoter methylation in individuals with lip pits compared to those without.
Conclusions:
- Differential DNA methylation in IRF6 and TP63 regulatory regions is associated with cleft type and phenotypic severity in VWS.
- Epigenetic modifications in these key genes contribute to the observed phenotypic heterogeneity in Van der Woude Syndrome.
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