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Published on: March 31, 2015
Functional Genomics Through Zebrafish CRISPR Prioritizes Candidate Genes for Hemifacial Microsomia
1Department of Comprehensive Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.
Background:
Hemifacial microsomia (HFM) is a genetically complex craniofacial disorder. While GWAS and family studies have identified multiple candidate genes, functional validation rates remain low (<10%).
Methods:
The authors established a high-throughput zebrafish CRISPR-Cas9 platform to functionally validate 16 prioritized genes (12 literature-derived, 4 bioinformatically predicted). Tg(col2a1a:EGFP) embryos underwent F0 knockout with ≥70% editing efficiency. Mandibular development was quantitatively analyzed using 6 morphometric parameters at 5 dpf.
Results:
The authors identified distinct phenotypic profiles among candidate genes: ednrb knockout caused panmandibular hypoplasia (Meckel cartilage ↓21%, P<0.0001); fgf3 deficiency led to selective arch defects (ceratohyal length ↓28%, P<0.0001); epas1 ablation resulted in unilateral dysgenesis (cranial length ↓24%, P<0.0001). In addition, gbx2 and pax1 knockouts showed significant craniofacial anomalies.
Conclusion:
This study utilizes functional genomics to prioritize EDNRB, FGF3, and EPAS1 as high-confidence candidate genes for hemifacial microsomia. Our findings suggest a functional landscape where distinct genetic pathways converge to produce HFM-like phenotypes and validate TP53 and ESR2 as potential environmental susceptibility factors. These findings enable gene-targeted therapeutic strategies and prenatal risk assessment.
