NM_000179.3:c.2342C>T

Variant names:

• chr2-47800325-C-T
• rs1553413710
• NM_000179.3:c.2342C>T

Variant summary

Our verdict is Pathogenic. The variant received 22 ACMG points: 22P and 0B. PS3 PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000179.3(MSH6):​c.2342C>T​(p.Pro781Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV005032832: This variant has been detected in individuals whose Lynch syndrome-associated tumors demonstrated high microsatellite instability (MSI-H) and/or loss of MSH6 by immunohistochemistry (IHC), and was classified as pathogenic by a study that evaluated multiple lines of evidence, including population data, functional evidence, in silico prediction models, segregation with disease and clinical phenotype including tumor characteristics (Tsai GJ et al. Genet Med, 2019 Jun" and additional evidence is available in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P781T) has been classified as Likely pathogenic. The gene MSH6 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MSH6 NM_000179.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4 U:1
• Conservation: PhyloP100: 7.85
• Publications: 1 publications found

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]

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: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Specifications for MSH6 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 22 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV005032832: This variant has been detected in individuals whose Lynch syndrome-associated tumors demonstrated high microsatellite instability (MSI-H) and/or loss of MSH6 by immunohistochemistry (IHC), and was classified as pathogenic by a study that evaluated multiple lines of evidence, including population data, functional evidence, in silico prediction models, segregation with disease and clinical phenotype including tumor characteristics (Tsai GJ et al. Genet Med, 2019 Jun;21:1435-1442; Ambry internal data).
• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 52 uncertain in NM_000179.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-47800324-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 182635.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 2-47800325-C-T is Pathogenic according to our data. Variant chr2-47800325-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 433914.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000179.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MSH6	NM_000179.3	MANE Select	c.2342C>T	p.Pro781Leu	missense	Exon 4 of 10	NP_000170.1	P52701-1
	MSH6	NM_001406795.1		c.2438C>T	p.Pro813Leu	missense	Exon 5 of 11	NP_001393724.1
	MSH6	NM_001406813.1		c.2348C>T	p.Pro783Leu	missense	Exon 4 of 10	NP_001393742.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MSH6	ENST00000234420.11	TSL:1 MANE Select	c.2342C>T	p.Pro781Leu	missense	Exon 4 of 10	ENSP00000234420.5	P52701-1
	MSH6	ENST00000445503.5	TSL:1	n.*1689C>T		non_coding_transcript_exon	Exon 3 of 9	ENSP00000405294.1	F8WAX8
	MSH6	ENST00000445503.5	TSL:1	n.*1689C>T		3_prime_UTR	Exon 3 of 9	ENSP00000405294.1	F8WAX8

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
1	-	-	Hereditary cancer-predisposing syndrome (1)
1	-	-	Hereditary nonpolyposis colon cancer (1)
1	-	-	Hereditary nonpolyposis colorectal neoplasms (1)
1	-	-	Lynch syndrome (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	D
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.8	H
PhyloP100		7.8
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-9.7	D
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.96
MutPred		0.86		Gain of MoRF binding (P = 0.0794)
MVP		0.98
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.97
gMVP		0.86
Mutation Taster		=6/94	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1553413710; hg19: chr2-48027464;