Mapping Genotype–Phenotype Correlations In Rare Genetic Syndromes With Head And Neck Manifestations: A Scoping Review
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Abstract
Background:
Rare genetic syndromes affecting the head and neck frequently present with distinctive craniofacial and osteodysplastic anomalies. Understanding genotype– phenotype correlations in these disorders is critical for accurate diagnosis, prognostication, and targeted interventions. This scoping review systematically maps molecular and phenotypic evidence across monogenic, multilocus, and ultra-rare syndromes.
Methods:
A comprehensive search identified 35 studies published between 2005 and 2025, including case reports, case series, cohort studies, and reviews. Data were synthesized narratively and integrated with tabular comparisons to evaluate associations between genes, mutation types, and craniofacial phenotypes. Functional evidence and the occurrence of Variants of Uncertain Significance (VUS) were summarized.
Results:
Well-characterized syndromes, such as Apert (FGFR2), Branchio-oculo-facial (TFAP2A), and Axenfeld–Rieger (PITX2, FOXC1), demonstrated robust genotype– phenotype correlations, with recurrent pathogenic variants consistently linked to features including craniosynostosis, midface hypoplasia, cleft palate, and micrognathia. Multilocus and oligogenic disorders revealed overlapping osteodysplastic and craniofacial phenotypes, highlighting additive effects of variants across interacting pathways.
VUS were frequently reported in transcription factors, splicing regulators, and structural genes (SOX9, COL2A1, EFTUD2, SNRPB), often clustering with specific phenotypes but lacking functional validation. Functional assays, including in vitro transcriptional/ splicing studies, murine and zebrafish models, and molecular modeling, strengthened variant interpretation where available. Across syndromes, phenotypic convergence was observed in a limited set of developmental pathways, suggesting common mechanisms underlying craniofacial dysmorphism despite genetic heterogeneity.
Conclusion:
This review delineates the spectrum of genotype– phenotype relationships in rare craniofacial syndromes, emphasizing well-characterized disorders with actionable molecular signatures and highlighting gaps in ultra-rare or multilocus conditions. Integration of high-resolution genomics with standardized functional assays and diverse cohorts is essential to refine variant interpretation, improve clinical translation, and advance precision medicine in craniofacial genetics.
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