PKMYT1
Chr 16protein kinase, membrane associated tyrosine/threonine 1
Also known as: MYT1, PPP1R126
The protein encoded by this gene is a membrane-associated serine/threonine kinase that negatively regulates cell cycle progression by phosphorylating and inactivating cyclin-dependent kinase 1, thereby controlling the transition from G2 phase to mitosis. Mutations cause autosomal recessive developmental and epileptic encephalopathy with microcephaly, typically presenting in early infancy with severe seizures and developmental delays. The gene shows moderate tolerance to loss-of-function variants, and the associated disorder primarily affects the central nervous system with prominent neurodevelopmental features.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
More LoF-intolerant than ~75% of genes
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
173 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 0 | 0 | 35 | 0 | 35 |
Likely Pathogenic | 0 | 0 | 0 | 0 | 0 |
VUS | 0 | 104 | 13 | 0 | 117 |
Likely Benign | 0 | 2 | 0 | 0 | 2 |
Benign | 0 | 0 | 0 | 1 | 1 |
| Total | 0 | 106 | 48 | 1 | 155 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
PKMYT1 · 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