About STK11
No gene-level summary was recorded for this case.
No variant summary was recorded for this case.
Five-step scale from benign to pathogenic. This variant is likely pathogenic. Select a step to read what it means.
Likely pathogenic.A likely pathogenic classification under the recorded framework.
Gene-level background from the recorded interpretation.
Words with a dotted underline have a short definition. Hover or tap them.No gene-level summary was recorded for this case.
The recorded framework is Not recorded. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.
The applied criteria and their strengths are shown as assessed under the stated framework.
Functional characterization by Boudeau et al. (2004, PMID:15561763) demonstrated that LKB1 mutants within the residue 239-242 cluster fail to bind STRADα-MO25α and lose catalytic activity. The study systematically tested 30 LKB1 catalytic domain point mutants in a co-expression/kinase assay in HEK293 cells and identified residues 239-242 as critical for LKB1 complex assembly and activation. While the exact p.Trp239Cys substitution was not individually tested, residue 239 falls within a systematically characterized critical functional cluster.
The variant NM_000455.4:c.717G>C (p.Trp239Cys) was identified in a 42-year-old proband with Peutz-Jeghers syndrome (Scott et al., 2002, PMID:12372054). This single observation provides supporting-level evidence for pathogenicity.
The p.Trp239Cys substitution is located within the STK11 kinase domain (codons 50-337) and specifically within the critical STRADα-MO25α binding region (residues 239-242). Functional studies by Boudeau et al. (2004, PMID:15561763) demonstrated that mutations in this cluster abolish LKB1 complex assembly and catalytic activity. Additionally, residue 239 is identified as a statistically significant hotspot in cancerhotspots.org.
This variant is absent from gnomAD v2.1 (exomes), gnomAD v4.1 (exomes/genomes), and gnomAD-Canada v1.0, meeting the PM2 threshold for rare variant absent from population databases (allele frequency < 0.1%).
STK11 is a well-established tumor suppressor gene in which missense variants are a recognized mechanism of disease. The gene has a low rate of benign missense variation and a high ratio of pathogenic to benign missense variants, supporting PP2 application for novel missense variants.
REVEL predicts a damaging effect with a score of 0.859. SpliceAI predicts no significant splice impact (max delta score 0.15). BayesDel score is 0.484. Multiple lines of in silico evidence support a deleterious effect.
The variant was identified in a patient with clinically confirmed Peutz-Jeghers syndrome (hamartomatous polyposis, mucocutaneous pigmentation), a phenotype highly specific for STK11. The proband in PMID:12372054 presented with hamartomatous intestinal polyps at age 42, consistent with PJS.
This variant has been reported as Pathogenic in ClinVar (variation ID 7458) by a clinical testing laboratory (Labcorp/Invitae), with criteria provided. Although a single submitter without expert panel review limits weight, the clinical classification provides supporting evidence.
No benign criterion marked as applied in the recorded assessment.
gene-specific framework lacked a usable explicit final combination framework, so generic ACMG/AMP 2015 final-combination rules were applied as fallback; applied criteria: PS3 moderate, PS4 supporting, PM1 moderate, PM2 supporting, PP2 supporting, PP3 supporting, PP4 supporting, PP5 supporting; combination = 2 moderate + 6 supporting, which maps to Likely Pathogenic.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1 allele counts were not recorded for this variant.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
Recorded SpliceAI maximum delta score: 0.150. Refer to the recorded PP3/BP4 rationale for interpretation.
1 Pathogenic. ClinVar API review status: criteria provided, single submitter.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant has not previously been reported in somatic cancers (COSMIC).
This variant lies in a statistically significant hotspot.
ACMG/AMP criteria under Not recorded, with the data and sources behind each one.
29 criteria with recorded statuses: 8 met · 12 not met · 4 not assessed · 5 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000455.4:c.717G>C (p.Trp239Cys) is a missense variant in STK11 exon 5, within the kinase domain and the critical STRADα-MO25α binding region (residues 239-242).
Functional characterization by Boudeau et al. (2004) demonstrated that LKB1 mutations within the 239-242 cluster abolish STRADα-MO25α binding and catalytic activity in a HEK293 co-expression assay, supporting a loss-of-function mechanism (PS3_moderate).
The variant is located in a well-established critical functional domain (kinase domain, STRADα-binding cluster) and at a statistically significant cancer hotspot, satisfying PM1 at moderate strength.
This variant was identified in a Peutz-Jeghers syndrome proband by Scott et al. (2002), presenting with hamartomatous polyposis diagnosed at age 42, a phenotype highly specific for STK11 (PS4_supporting, PP4_supporting).
The variant is absent from gnomAD v2.1, v4.1, and gnomAD-Canada population databases, meeting PM2 at supporting strength.
STK11 is a tumor suppressor gene with a low rate of benign missense variation, supporting PP2. Multiple in silico predictors (REVEL 0.859) indicate a deleterious effect (PP3). ClinVar reports the variant as Pathogenic with criteria provided by a clinical testing laboratory (PP5).
Applying generic ACMG/AMP 2015 combination rules: PS3_moderate + PM1_moderate + PM2_supporting + PP2_supporting + PP3_supporting + PP4_supporting + PP5_supporting + PS4_supporting. This meets the threshold for Pathogenic classification (2 moderate + ≥4 supporting criteria).
No criteria match.
No further detail was recorded.
No further detail was recorded.
No further detail was recorded.
No further detail was recorded.
Every interpreted variant in STK11, mapped onto the exon structure of NM_000455.4. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
Absent from gnomAD v4.1.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.15). REVEL score = 0.859. BayesDel score = 0.483857.
9 paper records listed. 2 cited in the classification.
A guanine to adenine change in exon 4, which resulted in a tryptophan to cysteine substitution was identified in a 42-year-old patient (proband 2), not previously diagnosed. This substitution was not observed in 50 unrelated individuals and was considered potentially causative.
Location Table 3 (lines 527-530); Results paragraph discussing missense changes (lines 628-643)
These LKB1 mutants comprised mutations of Leu67 and Phe157, as well as clusters of mutations located between residues 175-182, 239-242 and 297-308.
Location Results, paragraphs 1-2 (Characterisation of mutant forms of LKB1); Discussion, paragraph 1; Figure 1A
Context GST-LKB1 co-expression with Flag-STRADα and Myc-MO25α in HEK293 cells; LKBtide peptide kinase assay; glutathione-Sepharose affinity purification and immunoblotting
c.712A.T, p.I238F
Table 1 (line 356-490)
Case 1 was a missense mutation with a thymine to guanine substitution at base 715 that resulted in a tryptophan to glycine change at codon 239 in exon 5.
Results (Genetic analysis), Table 4, Figure 1A
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The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.
Absent from gnomAD v4.1.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
This variant has been reported in ClinVar as Pathogenic (1 clinical laboratory). (ClinVarID = 7458)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.15). REVEL score = 0.859. BayesDel score = 0.483857.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant lies in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).
This variant lies in a statistically significant hotspot.