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Classification rationale
1

NM_000179.3:c.836G>A (p.Ser279Asn) is a missense variant in MSH6 exon 4 that is absent from gnomAD v2.1 and v4.1, meeting the VCEP PM2_Supporting criterion (allele frequency <0.00002).

gnomad_v4 ↗ gnomad_v2 ↗ cspec ↗
2

Computational in silico predictors, including the MSH6-specific HCI prior probability of 0.0075, are consistent with a benign impact, meeting the VCEP BP4_Supporting criterion (HCI prior <0.11). SpliceAI predicts no splicing alteration (max delta score 0.00). REVEL score is 0.322 and BayesDel is -0.109.

spliceai ↗ cspec ↗
3

No functional assay data, segregation data, de novo observations, tumor phenotype data, or same-residue pathogenic comparator variants are available for this variant. The variant has been reported in ClinVar as Uncertain significance (2 clinical laboratories; ClinVar ID 234915) and has been observed once in somatic cancers (COSMIC COSV113286823).

clinvar ↗
4

Per the MSH6 VCEP v2.0.0 combination rules: PM2_Supporting (1 pathogenic supporting point) and BP4_Supporting (1 benign supporting point) are equivocal, resulting in a final classification of Uncertain Significance (VUS).

cspec ↗
Applied criteria
Met
Not met
Not assessed
N/A
Very strong
Strong
Moderate
Supporting
Pathogenic evidence
PVS
PVS1
PS
PS1
PS2
PS3
PS4
PM
PM1
PM2
PM3
PM4
PM5
PM6
PP
PP1
PP2
PP3
PP4
PP5
Benign evidence
BA
BA1
BS
BS1
BS2
BS3
BS4
BP
BP1
BP2
BP3
BP4
BP5
BP6
BP7
PVS1
Rationale
Select a criterion to inspect its explanation.
Evidence used
Gaps remaining
Rule
Publications
Research and evidence
ClinVar evidence
02
ClinVar
This variant has been reported in ClinVar as Uncertain significance (2 clinical laboratories). (ClinVarID = 234915)
Functional evidence
03
Functional
OncoKB: Unknown Oncogenic Effect
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. MSH6, a DNA mismatch repair protein, is frequently mutated in colorectal, small bowel, and endometrial cancers.
In silico evidence
04
In silico
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.322. BayesDel score = -0.109362. HCI prior probability for pathogenicity = 0.0075. MAPP score = 5.62. Custom PP2 score = 0.093.
COSMIC evidence
05
COSMIC
This variant does not lie in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV113286823, n = 1 times).
Cancer hotspots evidence
06
Cancer hotspots Not found
This variant does not lie in a statistically significant hotspot.