2-47799466-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000179.3(MSH6):c.1483C>T(p.Arg495*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,872 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. R495R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

MSH6
NM_000179.3 stop_gained

Scores

Clinical Significance

Pathogenic reviewed by expert panel P:25

Conservation

PhyloP100: 2.65

Publications

22 publications found

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 Gene-Disease associations (from GenCC):

intellectual developmental disorder with dysmorphic facies and behavioral abnormalities
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

FBXO11 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 2-47799466-C-T is Pathogenic according to our data. Variant chr2-47799466-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 89197.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH6	NM_000179.3 link	c.1483C>T	p.Arg495*	stop_gained	Exon 4 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.1483C>T	p.Arg495*	stop_gained	Exon 4 of 10	1	NM_000179.3	ENSP00000234420.5		P52701-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251182

AF XY:

0.00000737

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461872

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727230

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112002

Other (OTH)

AF:

0.0000166

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000107

Hom.:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:25

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not provided

Pathogenic:9

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MSH6: PVS1, PS4:Moderate -

Apr 09, 2018

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mayo Clinic Laboratories, Mayo Clinic

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jun 04, 2019

Revvity Omics, Revvity

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 21, 2024

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Observed in individuals with a personal and/or family history of Lynch syndrome associated cancers (PMID: 17100999, 20587412, 21642682, 23294250, 26437257, 26845104, 27601186, 31054147); Not observed at significant frequency in large population cohorts (gnomAD); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; This variant is associated with the following publications: (PMID: 20587412, 23294250, 26845104, 31054147, 21642682, 17100999, 27013479, 26437257, 27601186, 27742654, 28724667, 28874130, 30787465, 35449176, 33309985, 33693762, 36230473, 37307877, 29922827, 34707409, 37732318, 34873480) -

Sep 16, 2018

Gharavi Laboratory, Columbia University

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Lynch syndrome

Pathogenic:6

Feb 04, 2025

Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PVS1; PM2_SUP; PP4_SUP -

Mar 01, 2022

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Arg495X variant in MSH6 has been reported in at least 7 individuals with MSH6-associated cancers and at least 1 individual with breast cancer (Sjursen 2010 PMID: 20587412, Bonadona 2011 PMID: 21642682, Beggs 2013 PMID: 23294250, Carneiro da Silva 2015 PMID: 26437257, Lagerstedt-Robinson 2016 PMID: 27601186, Rossi 2017 PMID: 28874130, Sun 2017 PMID: 28724667, Tian 2019 PMID: 31054147). It has also been identified in 0.003% (1/30616) of South Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org). This nonsense variant leads to a premature termination codon at position 495, which is predicted to lead to a truncated or absent protein. Loss of function of the MSH6 gene is an established disease mechanism in autosomal dominant Lynch syndrome. Additionally, this variant was classified as pathogenic on September 5, 2013 by the ClinGen-approved InSiGHT expert panel (ClinVar Variation ID 89197). In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant Lynch syndrome. ACMG/AMP Criteria applied: PVS1, PM2_Supporting, PS4_Moderate. -

Sep 05, 2013

International Society for Gastrointestinal Hereditary Tumours (InSiGHT)

Significance:Pathogenic

Review Status:reviewed by expert panel

Collection Method:research

Coding sequence variation resulting in a stop codon -

Jan 30, 2019

A.C.Camargo Cancer Center / LGBM, A.C.Camargo Cancer Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

Nov 20, 2015

University of Washington Department of Laboratory Medicine, University of Washington

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 18, 2023

All of Us Research Program, National Institutes of Health

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant changes 1 nucleotide in exon 4 of the MSH6 gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with Lynch syndrome (PMID: 20587412, 21642682, 23294250, 26437257, 27601186, 27013479, 28874130) and breast cancer (PMID: 33471991, 28724667). This variant has been identified in 1/251182 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of MSH6 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

Hereditary cancer-predisposing syndrome

Pathogenic:3

Oct 11, 2023

Color Diagnostics, LLC DBA Color Health

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 14, 2023

Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 11, 2022

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.R495* pathogenic mutation (also known as c.1483C>T), located in coding exon 4 of the MSH6 gene, results from a C to T substitution at nucleotide position 1483. This changes the amino acid from an arginine to a stop codon within coding exon 4. This mutation has been identified in multiple individuals/families with HNPCC/Lynch syndrome based on personal and family history (Sjursen W et al. J. Med. Genet. 2010 Sep;47:579-85; Dominguez-Valentin M et al. BMC Urol. 2016 Mar;16:15; Beggs AD et al. Breast J. Jan;19:193-5). This alteration has been identified in a cohort of Swedish Lynch syndrome families (Lagerstedt-Robinson K et al. Oncol. Rep. 2016 Nov;36:2823-2835) and in a cohort of Latin American patients suspected of having Lynch syndrome (Rossi BM et al. BMC Cancer. 2017 Sep;17:623). This alteration was also detected in a cohort of 8085 consecutive unselected Chinese breast cancer patients who underwent multi-gene panel testing. (Sun J et al. Clin. Cancer Res. 2017 Oct;23:6113-6119). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Lynch syndrome 5

Pathogenic:2

Mar 28, 2023

Human Genetics Bochum, Ruhr University Bochum

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ACMG criteria used to clasify this variant:PVS1, PS4, PM2_SUP -

Aug 14, 2023

Myriad Genetics, Inc.

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered pathogenic. This variant creates a termination codon and is predicted to result in premature protein truncation. -

Carcinoma of colon

Pathogenic:1

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The p.Arg495X variant has been reported in the HGMD, COSMIC, InSiGHT databases and once in the literature in 5 out of 1028 proband chromosomes in individuals with HNPCC. However, no controls were tested to establish the frequency of the variant in the general population (Sjursen 2010). The variant leads to a premature stop codon at position 495 which is predicted to cause premature truncation of the protein product. This is a loss of function DNA variant and loss of function the MSH6 gene is an established disease mechanism for Lynch syndrome. In summary, based on the above information, this variant is classified as pathogenic. -

Hereditary nonpolyposis colon cancer

Pathogenic:1

Jun 24, 2024

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

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: MSH6 c.1483C>T (p.Arg495X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 4e-06 in 251182 control chromosomes. c.1483C>T has been reported in the literature in individuals affected with Lynch Syndrome (Bonadona_2011). These data do not allow any conclusion about variant significance. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 21642682). ClinVar contains an entry for this variant (Variation ID: 89197). Based on the evidence outlined above, the variant was classified as pathogenic. -

Lynch-like syndrome

Pathogenic:1

Jul 01, 2019

Constitutional Genetics Lab, Leon Berard Cancer Center

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Hereditary nonpolyposis colorectal neoplasms

Pathogenic:1

Sep 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Arg495*) in the MSH6 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MSH6 are known to be pathogenic (PMID: 18269114, 24362816). This variant is present in population databases (rs587779212, gnomAD 0.003%). This premature translational stop signal has been observed in individual(s) with clinical features of Lynch syndrome (PMID: 20587412, 21642682, 26437257, 27601186). Invitae Evidence Modeling of clinical and family history, age, sex, and reported ancestry of multiple individuals with this MSH6 variant has been performed. This variant is expected to be pathogenic with a positive predictive value of at least 99%. This is a validated machine learning model that incorporates the clinical features of 1,370,736 individuals referred to our laboratory for MSH6 testing. ClinVar contains an entry for this variant (Variation ID: 89197). For these reasons, this variant has been classified as Pathogenic. -

Endometrial carcinoma

Pathogenic:1

Jan 20, 2024

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.47

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Uncertain

0.46

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.94

PhyloP100

2.6

Vest4

0.89

GERP RS

1.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over