About FBXW7
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.
The R479L substitution was directly tested in a co-immunoprecipitation assay in 293T cells and demonstrated complete loss of FBXW7 interaction with its substrate DAB2IP, confirming disruption of substrate recognition function. This is a single study with direct variant testing using an indirect reporter-type assay, supporting moderate strength.
The variant is located at residue Arg479 within the WD40 substrate recognition domain of FBXW7, a well-characterized critical functional domain. This residue is a statistically significant mutational hotspot per cancerhotspots.org. Functional studies (PMID:24912918, PMID:17646408, PMID:17646409) confirm that mutations at this position disrupt FBXW7 substrate binding. The variant lies in the WD40 repeat domain that mediates substrate recognition, and no benign variation is observed at this position in population databases.
This variant is absent from gnomAD v2.1 (exomes), gnomAD v4.1 (exomes), and gnomAD-Canada v1.0. Allele frequency is below the 0.1% PM2 threshold for rare variant support in the generic ACMG framework.
Multiple lines of computational evidence support a deleterious effect: REVEL score of 0.583 (above the 0.5 threshold for pathogenicity) and SpliceAI predicts a possible splice alteration with a max delta score of 0.33 (acceptor loss). The variant also lies at a statistically significant mutational hotspot. BayesDel score is low at 0.125 but does not outweigh the preponderance of evidence from REVEL and SpliceAI.
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, PM1 moderate, PM2 supporting, PP3 supporting; combination = 2 moderate + 2 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: 0.330. Refer to the recorded PP3/BP4 rationale for interpretation.
A ClinVar laboratory submission summary was not recorded. ClinVar API review status: criteria provided, single submitter.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant has previously been reported in somatic cancers (COSMIC; COSV55899054, n = 18 times).
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: 4 met · 20 not met · 0 not assessed · 5 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_033632.3:c.1436G>T (p.Arg479Leu) is a missense variant in exon 10 of FBXW7, located at residue 479 within the WD40 substrate recognition domain.
This variant is absent from gnomAD v2.1, v4.1, and gnomAD-Canada population databases, meeting PM2 at supporting strength.
The variant lies at a statistically significant mutational hotspot (cancerhotspots.org) within the WD40 domain, a well-characterized functional domain critical for FBXW7 substrate recognition. Mutations at residue 479 have been shown to disrupt FBXW7-substrate interactions across multiple studies, meeting PM1 at moderate strength.
Functional studies directly testing the R479L substitution in a co-immunoprecipitation assay (293T cells) demonstrated complete loss of FBXW7 interaction with its substrate DAB2IP, confirming disruption of substrate recognition function. This meets PS3 at moderate strength.
Multiple in silico tools support a deleterious effect: REVEL score 0.583 and SpliceAI max delta score 0.33 (acceptor loss prediction). This meets PP3 at supporting strength.
The variant has been reported in ClinVar (Variation ID: 4530538) as Tier I - Strong with a single submitter (1-star review status). It has been observed in somatic cancers (COSMIC COSV55899054, 18 counts) but lacks independent germline proband observations. These data are insufficient for PP5 or PS4.
No criteria match.
Every interpreted variant in FBXW7, mapped onto the exon structure of NM_033632.3. 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 possible splice impact for this variant (max delta score = 0.33). REVEL score = 0.583. BayesDel score = 0.124658.
6 paper records listed. 3 cited in the classification.
we replaced the arginine at position 465, 479, or 505 with cysteine (DN FBW7 R465C and DN FBW7 R505C) or glutamine (DN FBW7 R479Q) and tested their abilities to interact with N1-IC
Location Results; Table of T-ALL mutations; Figure panels showing DN FBW7 mutants
Context Co-immunoprecipitation, T-ALL cell lines and 293T cells
the mutants were defective in NOTCH binding, although FBW7R479Q showed a modest amount of residual binding
Location Results, Figure 6A
Context Co-immunoprecipitation, T-ALL cell lines
Consistent with DAB2IP being a substrate of Fbw7, we found that three T-ALL associated mutations in Fbw7 (R465H, R479L, and R505C) no longer interacted of Fbw7 with DAB2IP (Figure 4B), providing further evidence that DAB2IP interaction with Fbw7 is through the substrate recognition domain of Fbw7.
Location Results, Figure 4B
Context Co-immunoprecipitation assay, 293T cells, FLAG-DAB2IP and HA-FBW7 constructs
Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.
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 but submission details could not be extracted. (ClinVarID = 4530538)
SpliceAI predicts possible splice impact for this variant (max delta score = 0.33). REVEL score = 0.583. BayesDel score = 0.124658.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant lies in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV55899054, n = 18 times).
This variant lies in a statistically significant hotspot.