PBX3
Chr 9PBX homeobox 3
PBX3 encodes a transcriptional activator that binds specific DNA sequences to regulate gene expression during embryonic development, particularly affecting nervous system, eye, and organ development. Mutations cause autosomal recessive congenital fibrosis of the extraocular muscles with developmental delay, ptosis, and intellectual disability. The gene shows moderate constraint against loss-of-function variants (LOEUF 0.476), and the associated disorder typically presents from birth with characteristic ocular abnormalities.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
More LoF-intolerant than ~75% of genes
Moderately missense-constrained (top ~2.5%)
The highest-scoring mechanism for this gene is dominant-negative.
Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.
ClinVar Variant Classifications
0 submitted variants in ClinVar
Protein Context — Lollipop Plot
PBX3 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools