About MSH6
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 uncertain. Select a step to read what it means.
Uncertain.The recorded classification is uncertain significance.
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 ClinGen MSH6 VCEP v2.0.0. 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.
No pathogenic criterion marked as applied in the recorded assessment.
HCI prior probability for pathogenicity 0.0007 falls below the InSiGHT MSH6 VCEP BP4_Supporting threshold of <0.11. SpliceAI max delta score 0.00 confirms no predicted splicing impact. REVEL score 0.216 and BayesDel score -0.443 are also consistent with a benign computational profile.
ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for MSH6 Version 2.0.0 v2.0.0 criteria-combination framework was evaluated deterministically with applied criteria: BP4 supporting benign; no rule matched the adjudicated criteria.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 150 / 1,614,044 alleles. Recorded AF 9.29343e-05. Recorded homozygote count 1.
This variant is present in gnomAD v2.1 (AF= 7.4311e-05; MAF= 0.00743%, 21/282596 alleles, homozygotes = 1) and has highest observed frequency in the South Asian population (AF= 0.000293964; MAF= 0.02940%, 9/30616 alleles, homozygotes = 1); grpmax FAF= 0.00015255.
This variant is present in gnomAD-Canada v1.0 (AF= 0.00021715526601520088, 4/18420 alleles, homozygotes = 0).
Recorded SpliceAI maximum delta score: 0.000. Refer to the recorded PP3/BP4 rationale for interpretation.
9 Likely benign · 4 Uncertain significance · 1 Benign.
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.
This variant has previously been reported in somatic cancers (COSMIC; COSV52274944, n = 3 times).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under ClinGen MSH6 VCEP v2.0.0, with the data and sources behind each one.
29 criteria with recorded statuses: 1 met · 5 not met · 9 not assessed · 14 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000179.3(MSH6):c.1054G>A (p.Val352Ile) is a missense substitution in exon 4 of MSH6.
This variant has been observed in gnomAD v4.1 at an overall allele frequency of 0.000093 (150/1,614,044 alleles, 1 homozygote), with a grpmax filtering allele frequency of 0.000199 (0.0199%). In gnomAD v2.1 the variant is present at an allele frequency of 0.000074 (21/282,596 alleles, 1 homozygote). It is absent from gnomAD-Canada v1.0.
The gnomAD v4.1 grpmax FAF (0.000199) is below the InSiGHT MSH6 VCEP BS1 threshold of ≥0.00022 and far below the BA1 threshold of ≥0.0022, so neither allele-frequency-based benign criterion is met. The overall allele frequency also exceeds the PM2 supporting threshold of <0.00002, so PM2 is not met.
Computational predictors strongly favor a benign effect: the HCI prior probability for pathogenicity is 0.0007 (far below the BP4_Supporting threshold of <0.11), SpliceAI predicts no splicing impact (max delta 0.00), REVEL score is 0.216, and BayesDel score is -0.443.
The variant was detected as a somatic finding in a tumor from a suspected Lynch syndrome patient (PMID:25111426), where it was classified as class 2 (likely not pathogenic) with 34% variant allele frequency, retention of heterozygosity, and normal MMR protein expression by IHC. This somatic observation is consistent with a benign or low-impact variant but does not independently meet any VCEP criterion in a germline context.
In ClinVar, this variant is reported as Likely benign by 9 clinical laboratories, Uncertain significance by 4, and Benign by 1 (ClinVar Variation ID: 182617). The InSiGHT expert panel has not issued a classification for this variant.
No pathogenic or likely pathogenic missense variants at the same amino acid residue (Val352) were identified in InSiGHT VCEP records, so PM5 cannot be assessed.
Applying the InSiGHT MSH6 VCEP version 2.0.0 combining rules: BP4_Supporting is the only criterion met. With a single benign supporting criterion, neither the Likely Benign threshold (≥2 benign supporting per Rule 19, or 1 benign strong + 1 benign supporting per Rule 18) nor any pathogenic threshold is reached. The variant is classified as Uncertain Significance.
No criteria match.
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Every interpreted variant in MSH6, mapped onto the exon structure of NM_000179.3. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| Amish5 / 912 | 0.0055 |
| South Asian26 / 91,092 | 0.000291 hom |
| European (non-Finnish)112 / 1,180,022 | 9.5e-05 |
| Remaining individuals5 / 62,486 | 8e-05 |
| African/African American2 / 74,936 | 2.7e-05 |
| South Asian9 / 30,616 | 0.000291 hom |
| European (non-Finnish)11 / 128,944 | 8.5e-05 |
| African/African American1 / 24,956 | 4e-05 |
This variant is present in gnomAD v4.1 (AF= 9.29343e-05; MAF= 0.00929%, 150/1614044 alleles, homozygotes = 1) and has highest observed frequency in the Amish population (AF= 0.00548246; MAF= 0.54825%, 5/912 alleles, homozygotes = 0); grpmax FAF= 0.00019901.
This variant is present in gnomAD v2.1 (AF= 7.4311e-05; MAF= 0.00743%, 21/282596 alleles, homozygotes = 1) and has highest observed frequency in the South Asian population (AF= 0.000293964; MAF= 0.02940%, 9/30616 alleles, homozygotes = 1); grpmax FAF= 0.00015255.
This variant is present in gnomAD-Canada v1.0 (AF= 0.00021715526601520088, 4/18420 alleles, homozygotes = 0).
No further detail was recorded.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.216. BayesDel score = -0.442852. HCI prior probability for pathogenicity = 0.0007. MAPP score = 2.28. Custom PP2 score = 0.001.
9 paper records listed. No publication is explicitly linked to an applied criterion in the recorded metadata.
MSH6: c.1054G>A; p.V352I / 2 / 34% (67/200) / ROH / no deficient MMR protein
Supplementary Table (lines 1625-1631 of full text), listing somatic MMR gene variants identified in tumors of sLS patients
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.
This variant is present in gnomAD v4.1 (AF= 9.29343e-05; MAF= 0.00929%, 150/1614044 alleles, homozygotes = 1) and has highest observed frequency in the Amish population (AF= 0.00548246; MAF= 0.54825%, 5/912 alleles, homozygotes = 0); grpmax FAF= 0.00019901.
This variant is present in gnomAD v2.1 (AF= 7.4311e-05; MAF= 0.00743%, 21/282596 alleles, homozygotes = 1) and has highest observed frequency in the South Asian population (AF= 0.000293964; MAF= 0.02940%, 9/30616 alleles, homozygotes = 1); grpmax FAF= 0.00015255.
This variant is present in gnomAD-Canada v1.0 (AF= 0.00021715526601520088, 4/18420 alleles, homozygotes = 0).
This variant has been reported in ClinVar as Likely benign (9 clinical laboratories) and as Uncertain significance (4 clinical laboratories) and as Benign (1 clinical laboratory). (ClinVarID = 182617)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.216. BayesDel score = -0.442852. HCI prior probability for pathogenicity = 0.0007. MAPP score = 2.28. Custom PP2 score = 0.001.
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.
This variant does not lie in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV52274944, n = 3 times).
This variant does not lie in a statistically significant hotspot.