2-47803546-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4BP6

The NM_000179.3(MSH6):c.3299C>T(p.Thr1100Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000341 in 1,613,980 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

MSH6
NM_000179.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:14B:4

Conservation

PhyloP100: 4.15

Variant links:

Genes affected

MSH6 (HGNC:7329): (mutS homolog 6) This gene encodes a member of the DNA mismatch repair MutS family. In E. coli, the MutS protein helps in the recognition of mismatched nucleotides prior to their repair. A highly conserved region of approximately 150 aa, called the Walker-A adenine nucleotide binding motif, exists in MutS homologs. The encoded protein heterodimerizes with MSH2 to form a mismatch recognition complex that functions as a bidirectional molecular switch that exchanges ADP and ATP as DNA mismatches are bound and dissociated. Mutations in this gene may be associated with hereditary nonpolyposis colon cancer, colorectal cancer, and endometrial cancer. Transcripts variants encoding different isoforms have been described. [provided by RefSeq, Jul 2013]

MSH6 links:

FBXO11 (HGNC:13590): (F-box protein 11) This gene encodes a member of the F-box protein family which is characterized by an approximately 40 amino acid motif, the F-box. The F-box proteins constitute one of the four subunits of ubiquitin protein ligase complex called SCFs (SKP1-cullin-F-box), which function in phosphorylation-dependent ubiquitination. The F-box proteins are divided into 3 classes: Fbws containing WD-40 domains, Fbls containing leucine-rich repeats, and Fbxs containing either different protein-protein interaction modules or no recognizable motifs. The protein encoded by this gene belongs to the Fbxs class. It can function as an arginine methyltransferase that symmetrically dimethylates arginine residues, and it acts as an adaptor protein to mediate the neddylation of p53, which leads to the suppression of p53 function. This gene is known to be down-regulated in melanocytes from patients with vitiligo, a skin disorder that results in depigmentation. Polymorphisms in this gene are associated with chronic otitis media with effusion and recurrent otitis media (COME/ROM), a hearing loss disorder, and the knockout of the homologous mouse gene results in the deaf mouse mutant Jeff (Jf), a single gene model of otitis media. Alternatively spliced transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jun 2010]

FBXO11 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.34337825).

BP6

Variant 2-47803546-C-T is Benign according to our data. Variant chr2-47803546-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 89369.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=1, Uncertain_significance=12}. Variant chr2-47803546-C-T is described in Lovd as [Likely_benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH6	NM_000179.3 link	c.3299C>T	p.Thr1100Met	missense_variant	Exon 5 of 10	ENST00000234420.11	NP_000170.1	P52701-1Q3SWU9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH6	ENST00000234420.11 link	c.3299C>T	p.Thr1100Met	missense_variant	Exon 5 of 10	1	NM_000179.3	ENSP00000234420.5		P52701-1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152094

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000398

AC:

AN:

251432

Hom.:

AF XY:

0.0000368

AC XY:

AN XY:

135886

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000308

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.0000316

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000927

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000288

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152094

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74302

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.000478

Bravo

AF:

0.0000529

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:14Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:4

May 03, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: MSH6 c.3299C>T (p.Thr1100Met) results in a non-conservative amino acid change located in the DNA mismatch repair protein MutS, core (IPR007696) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-05 in 251432 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in MSH6 causing Hereditary Nonpolyposis Colorectal Cancer (4e-05 vs 0.00014), allowing no conclusion about variant significance. c.3299C>T has been reported in the literature in individuals affected with or suspected to have Hereditary Nonpolyposis Colorectal Cancer, or colorectal cancer or breast cancer (Example: Ackay_2021, Schuber_2020, Berends_2002, deVoer_2016, Kwong_2020). The variant was also reported to cosegregate with heterozygous pathogenic MUTYH p.Tyr179Cys in multiple colorectal cancer-affected members of a suspected Lynch syndrome family (Schuber_2020). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Nonpolyposis Colorectal Cancer. At least one publication reports experimental evidence evaluating an impact on protein function (Schuber_2020). The following publications have been ascertained in the context of this evaluation (PMID: 32658311, 11709755, 25801821, 31422818, 32068069, 32615015, 23621914, 25980754, 26901136, 35449176). ClinVar contains an entry for this variant (Variation ID: 89369). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Jan 25, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Thr1100Met variant in MSH6 has been reported in 2 individuals with suspect ed colorectal cancer or Lynch syndrome (Berends 2002, Yurgelun 2015). This varia nt has also been identified in 2/16512 of South Asian chromosomes by the Exome A ggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs63750442). Computational prediction tools and conservation analysis do not provide strong s upport for or against an impact to the protein. In addition, the p.Thr1100Met va riant has been classified as a variant of uncertain significance on Sept 5, 2013 by the ClinGen-approved InSiGHT expert panel (ClinVar SCV000108047.2). In summ ary, the clinical significance of the p.Thr1100Met variant is uncertain. -

Sep 23, 2019

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer-predisposing syndrome

Uncertain:2Benign:2

Apr 05, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces threonine with methionine at codon 1100 of the MSH6 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). A functional study has reported that this variant does not impact in vitro DNA mismatch repair activity (PMID: 32615015). This variant has been reported in individuals affected with Lynch syndrome-associated cancer and/or polyps (PMID: 11709755, 25980754, 26901136, 30267214) and skin melanoma and thyroid cancer (PMID: 2968408). This variant also has been reported to cosegregate with heterozygous pathogenic MUTYH p.Tyr179Cys in three colorectal cancer-affected members of a suspected Lynch syndrome family (PMID: 32615015). This variant has been identified in 12/282832 chromosomes in the general population by the Genome Aggregation Database (gnomAD) and in healthy controls (PMID: 32980694). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Jun 04, 2021

Sema4, Sema4

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Mar 24, 2025

Molecular Diagnostics Laboratory, Catalan Institute of Oncology

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

BP4, BP5 The c.3299C>T variant, located in exon 5 of the MSH6 gene, is predicted to result in the substitution of threonine by methionine at codon 1100; p.(Thr1100Met). This variant is found in 55/1613980 alleles at a frequency of 0,0034% in the gnomAD v4 database, with a filter allele frequency of 0.0043% (South Asian dataset). Computational tools for this variant suggests no significant impact on splicing (SpliceAI) or protein function (MAPP+PolyPhen-2 prior probability for pathogenicity: 0.06) (BP4). It has been reported in several colorectal cancer patients showing conserved MSH6 expression in CRC (PMID: 32615015, 11709755 and internal data) (BP5). A functional study reported that this variant does not impact in vitro DNA mismatch repair activity (PMID: 32615015). In addition, the variant has been reported in ClinVar (13x uncertain significance, 2x likely benign, 1x benign), LOVD (9x uncertain significance, 2x likely benign, 2x not classified) and in the InSiGHT database as Class 3: uncertain (Insufficient evidence). Based on currently available information, the variant c.3299C>T is classified as a likely benign variant according to ClinGen_Insight_ACMG_Specifications_MSH6_v1.0.0. -

Dec 21, 2023

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Lynch syndrome

Uncertain:2

Sep 23, 2024

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Mar 11, 2015

CSER _CC_NCGL, University of Washington

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

not provided

Uncertain:2

Sep 09, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The MSH6 c.3299C>T (p.Thr1100Met) variant has been reported in the published literature in individuals with colorectal cancer (PMIDs: 11709755 (2002), 26901136 (2016), 32658311 (2021), 30267214 (2018)), breast cancer (PMID: 32068069 (2020), 35449176 (2022)) and suspected Lynch syndrome (PMID: 25980754 (2015)). This variant has also been identified in reportedly healthy individuals (PMID: 36243179 (2022)). In one family, this variant was found to co-occur with a pathogenic MUTYH variant in three individuals with colorectal cancer (PMID: 32615015 (2020)). One in vitro functional study demonstrated this variant has a mismatch repair efficiency similar to wildtype (PMID: 32615015 (2020)). The frequency of this variant in the general population, 0.000031 (4/129154 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. -

Feb 11, 2025

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in patients with colorectal cancer (CRC) or other Lynch syndrome-associated cancers, and segregated with CRC in one family together with a MUTYH pathogenic variant (PMID: 11709755, 25980754, 26901136, 30267214, 32615015); Published functional studies suggest no damaging effect: mismatch repair activity similar to wild-type (PMID: 32615015); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25801821, 32615015, 32980694, 25980754, 23621914, 24362816, 26269718, 26901136, 11709755, 35422474, 32658311, 33471991, 29684080, 30267214, 31422818, 32068069, 36243179, 35449176, 17531815, 21120944) -

MSH6-related disorder

Uncertain:1

Apr 05, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The MSH6 c.3299C>T variant is predicted to result in the amino acid substitution p.Thr1100Met. This variant has been reported in individuals with Lynch syndrome-associated cancers such as colorectal cancers and in controls (Examples: Table 1. Berends et al 2002. PubMed ID: 11709755; Supplemental Table 2. Yurgelun et al 2015. PubMed ID: 25980754; Supplemental Table 2. Rosenthal EA et al 2018. PubMed ID: 30267214; Table S2. Okawa et al 2022. PubMed ID: 36243179). This variant is reported in 0.0080% of alleles in individuals of African descent in gnomAD and is interpreted as uncertain in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/89369/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Endometrial carcinoma;C1833477:Lynch syndrome 5;C5399763:Mismatch repair cancer syndrome 1

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Malignant tumor of breast

Uncertain:1

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The MSH6 p.Thr1100Met variant was identified in 3 of 3262 proband chromosomes (frequency: 0.001) from individuals or families with colorectal cancer (Berends 2002, de Voer 2016, Yurgelun 2015). The variant was also identified in dbSNP (ID: rs63750442) as With Uncertain significance allele, ClinVar (classified as uncertain significance by Invitae, Ambry Genetics, GeneDx, Color Genomics, and 5 clinical laboratories), Clinvitae, Cosmic, MutDB, UMD-LSDB (1X classified as uncertain significance), Mismatch Repair Genes Variant Database, and Insight Hereditary Tumors Database (as unclassified variant) databases. The variant was not identified in GeneInsight-COGR, or the Zhejiang Colon Cancer Database. The variant was identified in control databases in 11 of 277180 chromosomes at a frequency of 0.00004 (Genome Aggregation Database Feb 27, 2017). The variant was identified in the following populations: African in 2 of 24038 chromosomes (freq: 0.0001), â€šÃ„ÃºOtherâ€šÃ„Ã¹ in 1 of 6464 chromosomes (freq: 0.0002), European in 5 of 126684 chromosomes (freq: 0.00004), East Asian in 1 of 18868 chromosomes (freq: 0.0001), and South Asian in 2 of 30782 chromosomes (freq: 0.0001), while the variant was not observed in the Latino, Ashkenazi Jewish, or Finnish populations. The p.Thr1100 residue is conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and 1 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing; this is not very predictive of pathogenicity. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Endometrial carcinoma

Uncertain:1

Mar 04, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Lynch syndrome 5

Benign:1

Jan 23, 2024

Myriad Genetics, Inc.

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign. This variant is strongly associated with less severe personal and family histories of cancer, typical for individuals without pathogenic variants in this gene [PMID: 27363726]. -

Hereditary nonpolyposis colorectal neoplasms

Benign:1

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.00033

BayesDel_noAF

Uncertain

0.0

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.31

.;.;T;D;.

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.14

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.88

.;D;D;D;D

M_CAP

Benign

0.043

MetaRNN

Benign

0.34

T;T;T;T;T

MetaSVM

Uncertain

0.021

MutationAssessor

Benign

1.0

.;.;.;L;.

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-2.5

.;N;.;N;D

REVEL

Uncertain

0.59

Sift

Benign

0.031

.;D;.;D;D

Sift4G

Uncertain

0.0090

D;D;T;D;D

Polyphen

0.12

.;.;.;B;.

Vest4

0.51

MutPred

0.53

.;.;.;Loss of methylation at K1101 (P = 0.0283);.;

MVP

0.94

ClinPred

0.10

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.16

gMVP

0.71

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over