rs377746844

Variant names:

• chr2-47803695-TCTTA-T
• rs377746844
• NM_000179.3:c.3438+11_3438+14delCTTA

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP6_Very_Strong BS1 BS2

The NM_000179.3(MSH6):​c.3438+11_3438+14delCTTA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000111 in 1,614,182 control chromosomes in the GnomAD database, including 2 homozygotes. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00023 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000099 (2 hom.)
• Consequence: MSH6 NM_000179.3 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts U:1 B:16
• Conservation: PhyloP100: 0.953
• Publications: 3 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: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

ACMG classification

Our verdict: Benign. The variant received -16 ACMG points.

• BP6: Variant 2-47803695-TCTTA-T is Benign according to our data. Variant chr2-47803695-TCTTA-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 89384.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00023 (35/152316) while in subpopulation EAS AF = 0.00193 (10/5184). AF 95% confidence interval is 0.00105. There are 0 homozygotes in GnomAd4. There are 17 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAdExome4 at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MSH6	NM_000179.3	c.3438+11_3438+14delCTTA		intron_variant	Intron 5 of 9	ENST00000234420.11	NP_000170.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MSH6	ENST00000234420.11	c.3438+11_3438+14delCTTA		intron_variant	Intron 5 of 9	1	NM_000179.3	ENSP00000234420.5

Frequencies

GnomAD3 genomes AF: 0.000230 AC: 35 AN: 152198 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000410

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00192

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000219 AC: 55 AN: 250742 AF XY: 0.000206

Gnomad AFR exome AF: 0.000314

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00207

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000793

Gnomad OTH exome AF: 0.000328

GnomAD4 exome AF: 0.0000985 AC: 144 AN: 1461866 Hom.: 2 AF XY: 0.0000935 AC XY: 68 AN XY: 727236

African (AFR) AF: 0.0000896 AC: 3 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00118 AC: 47 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.000347 AC: 2 AN: 5768

European-Non Finnish (NFE) AF: 0.0000270 AC: 30 AN: 1111990

Other (OTH) AF: 0.00103 AC: 62 AN: 60396

GnomAD4 genome AF: 0.000230 AC: 35 AN: 152316 Hom.: 0 Cov.: 32 AF XY: 0.000228 AC XY: 17 AN XY: 74482

African (AFR) AF: 0.000409 AC: 17 AN: 41574

American (AMR) AF: 0.000196 AC: 3 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00193 AC: 10 AN: 5184

South Asian (SAS) AF: 0.000207 AC: 1 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68028

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.000260 Hom.: 0

Bravo AF: 0.000234

Asia WGS AF: 0.00520 AC: 18 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:1 Benign:16

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:7

Nov 15, 2018

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Clinical Genetics, Academic Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

May 04, 2017

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 11, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 12, 2017

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

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The MSH6 c.3438+11_3438+14delCTTA variant involves the alteration of 4 intronic nucleotides. One in silico tool predicts a benign outcome for this variant. 5/5 splice prediction tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. This variant was found in 27/120966 control chromosomes, predominantly observed in the East Asian subpopulation at a frequency of 0.002081 (18/8650). This frequency is about 15 times the estimated maximal expected allele frequency of a pathogenic MSH6 variant (0.0001421), suggesting this is likely a benign polymorphism found primarily in the populations of East Asian origin. Multiple clinical diagnostic laboratories/reputable databases classified this variant as benign/likely benign. Additionally, the variant was detected in an internal specimen which also carries likely pathogenic MLH1 c.347delC. Taken together, this variant is classified as benign. -

Hereditary cancer-predisposing syndrome Benign:4

May 28, 2014

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is found in BR-OV-HEREDIC panel(s). -

Oct 09, 2019

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as 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. -

Apr 26, 2015

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 10, 2021

Sema4, Sema4

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: curation

- -

not specified Benign:2

Aug 02, 2021

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Carcinoma of colon 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 c.3438+11_3438+14del variant was identified in 1 of 68 proband chromosomes (frequency: 0.015) from individuals or families with Lynch syndrome (Chan 1999). The variant was also identified in the following databases: dbSNP (ID: rs377746844) as “With Uncertain significance allele”, ClinVar (as uncertain significance, reviewed by expert panel), Clinvitae (as benign, likely benign, and uncertain significance), COGR, Insight Colon Cancer Gene Variant Database (as Class 3: uncertain), and Insight Hereditary Tumors Database (as Class 3: uncertain). The variant was not identified in Cosmic, MutDB, UMD-LSDB, Zhejiang Colon Cancer Database, or the Mismatch Repair Genes Variant Database. The variant was identified by our laboratory in 2 individuals with Lynch syndrome. The variant was identified in control databases in 63 of 277008 chromosomes (1 homozygous) at a frequency of 0.0003 (Genome Aggregation Database Feb 27, 2017). It was observed in the following populations: East Asian in 39 of 18864 chromosomes (freq: 0.002), “Other” in 5 of 6460 chromosomes (freq: 0.0008), African in 9 of 24016 chromosomes (freq: 0.0004), European Non-Finnish in 9 of 126542 chromosomes (freq: 0.00007), South Asian in 1 of 30782 chromosomes (freq: 0.00003); it was not observed in the Ashkenazi Jewish, European (Finnish), and Latino populations. 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 the loss of a cryptic splice acceptor site. 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. -

Lynch syndrome 5 Benign:1

Sep 28, 2016

Counsyl

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Breast and/or ovarian cancer Benign:1

Jan 05, 2023

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary nonpolyposis colorectal neoplasms Benign:1

Feb 02, 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
PhyloP100		0.95
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: rs377746844; hg19: chr2-48030834;