2-47783116-G-A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS1

The ENST00000445503.5(MSH6):c.-118G>A variant causes a 5 prime UTR, NMD transcript change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00258 in 1,413,074 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0021 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0026 (15 hom.)
• Consequence: MSH6 ENST00000445503.5 5_prime_UTR, NMD_transcript
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.275

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]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.78).
• BP6: Variant 2-47783116-G-A is Benign according to our data. Variant chr2-47783116-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 336435.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00212 (323/152070) while in subpopulation AMR AF= 0.00596 (91/15278). AF 95% confidence interval is 0.00497. There are 0 homozygotes in gnomad4. There are 157 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSH6	NM_000179.3			upstream_gene_variant		ENST00000234420.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSH6	ENST00000234420.11			upstream_gene_variant		1	NM_000179.3	P4

Frequencies

GnomAD3 genomes AF: 0.00213 AC: 323 AN: 151960 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000459

Gnomad AMI AF: 0.00883

Gnomad AMR AF: 0.00596

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.000189

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00278

Gnomad OTH AF: 0.00623

GnomAD4 exome AF: 0.00263 AC: 3317 AN: 1261004 Hom.: 15 Cov.: 17 AF XY: 0.00254 AC XY: 1594 AN XY: 628618

Gnomad4 AFR exome AF: 0.000532

Gnomad4 AMR exome AF: 0.00302

Gnomad4 ASJ exome AF: 0.0000881

Gnomad4 EAS exome AF: 0.0000306

Gnomad4 SAS exome AF: 0.000319

Gnomad4 FIN exome AF: 0.0000484

Gnomad4 NFE exome AF: 0.00312

Gnomad4 OTH exome AF: 0.00259

GnomAD4 genome AF: 0.00212 AC: 323 AN: 152070 Hom.: 0 Cov.: 33 AF XY: 0.00211 AC XY: 157 AN XY: 74344

Gnomad4 AFR AF: 0.000458

Gnomad4 AMR AF: 0.00596

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.000189

Gnomad4 NFE AF: 0.00278

Gnomad4 OTH AF: 0.00616

Alfa AF: 0.000159 Hom.: 0

Bravo AF: 0.00257

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Lynch syndrome 5 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
Cadd	Benign	6.7
Dann	Benign	0.86

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

LitVar

Other links and lift over

dbSNP: rs556432240; hg19: chr2-48010255;