PTPN20
Chr 10protein tyrosine phosphatase non-receptor type 20
Also known as: CT126, PTPN20A, PTPN20B, bA142I17.1, bA42B19.1
The protein is a tyrosine-specific protein phosphatase that targets sites of actin polymerization and dephosphorylates various tyrosyl phosphorylated substrates in response to extracellular stimuli. Based on available data, no definitive disease associations or inheritance patterns have been established for PTPN20 mutations in pediatric neurological disorders. The gene shows low constraint against loss-of-function variants, suggesting it may tolerate such changes without causing severe developmental phenotypes.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
Highly tolerant — LoF variants common in population
Mild missense constraint
This gene has evidence for multiple mechanisms of pathogenicity (gain-of-function and dominant-negative). Both the Badonyi & Marsh prediction and the broader genomic evidence point to gain-of-function as the predominant mechanism. Different variants in this gene may act through different mechanisms — interpret in context of the specific variant.
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
117 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories· variant type breakdown unavailable
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | — | — | — | — | 34 |
Likely Pathogenic | — | — | — | — | 17 |
VUS | — | — | — | — | 23 |
Likely Benign | — | — | — | — | 3 |
Benign | — | — | — | — | 39 |
| Total | — | 116 | |||
Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
PTPN20 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
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