NM_000179.3:c.198G>A

Variant names:

• chr2-47783431-G-A
• rs1299712565
• NM_000179.3:c.198G>A

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 2P and 13B. PM2 BP4_Strong BP6_Very_Strong BP7

The NM_000179.3(MSH6):​c.198G>A​(p.Pro66Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000148 in 1,348,720 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 Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. P66P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: MSH6 NM_000179.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.251
• Publications: 0 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]

MSH6 Gene-Disease associations (from GenCC):

• Lynch syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, ClinGen, Orphanet
• Lynch syndrome 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Genomics England PanelApp
• mismatch repair cancer syndrome 1

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• mismatch repair cancer syndrome 3

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P
• ovarian cancer

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• malignant pancreatic neoplasm

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• Muir-Torre syndrome

  Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• rhabdomyosarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• breast cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• prostate cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• hereditary breast carcinoma

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Benign. The variant received -11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.67).
• BP6: Variant 2-47783431-G-A is Benign according to our data. Variant chr2-47783431-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 820469.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.251 with no splicing effect.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MSH6	NM_000179.3	MANE Select	c.198G>A	p.Pro66Pro	synonymous	Exon 1 of 10	NP_000170.1
	MSH6	NM_001406804.1		c.143G>A	p.Arg48His	missense	Exon 1 of 10	NP_001393733.1
	MSH6	NM_001406795.1		c.198G>A	p.Pro66Pro	synonymous	Exon 1 of 11	NP_001393724.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MSH6	ENST00000234420.11	TSL:1 MANE Select	c.198G>A	p.Pro66Pro	synonymous	Exon 1 of 10	ENSP00000234420.5
	MSH6	ENST00000445503.5	TSL:1	n.198G>A		non_coding_transcript_exon	Exon 1 of 9	ENSP00000405294.1
	MSH6	ENST00000700002.1		c.198G>A	p.Pro66Pro	synonymous	Exon 1 of 10	ENSP00000514750.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000148 AC: 2 AN: 1348720 Hom.: 0 Cov.: 34 AF XY: 0.00000302 AC XY: 2 AN XY: 662822

African (AFR) AF: 0.0000361 AC: 1 AN: 27732

American (AMR) AF: 0.00 AC: 0 AN: 26018

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21992

East Asian (EAS) AF: 0.00 AC: 0 AN: 33500

South Asian (SAS) AF: 0.00 AC: 0 AN: 72542

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46572

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5428

European-Non Finnish (NFE) AF: 9.44e-7 AC: 1 AN: 1059532

Other (OTH) AF: 0.00 AC: 0 AN: 55404

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Hereditary cancer-predisposing syndrome (1)
-	-	1	Lynch syndrome 5 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.67
CADD	Benign	6.5
DANN	Benign	0.95
PhyloP100		-0.25
PromoterAI		0.0017	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Mutation Taster		=100/0	polymorphism

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: rs1299712565; hg19: chr2-48010570;