PHLDB1
Chr 11ARpleckstrin homology like domain family B member 1
Also known as: LL5A, LL5alpha, OI23
The PHLDB1 protein regulates embryonic development, epithelial to mesenchymal transition, and microtubule cytoskeleton organization. Mutations cause osteogenesis imperfecta type XXIII with autosomal recessive inheritance. The gene is highly constrained against loss-of-function variants (LOEUF 0.372), suggesting that complete loss of protein function is likely pathogenic.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
More LoF-intolerant than ~75% of genes
Mild missense constraint
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
PHLDB1 · 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