rs878854136

Variant names:

• chr8-31120338-T-TTA
• rs878854136
• NM_000553.6:c.2546_2547dupAT

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000553.6(WRN):​c.2546_2547dupAT​(p.Gln850IlefsTer27) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. Q850Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: WRN NM_000553.6 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.62
• Publications: 0 publications found

Genes affected

WRN (HGNC:12791): (WRN RecQ like helicase) This gene encodes a member of the RecQ subfamily of DNA helicase proteins. The encoded nuclear protein is important in the maintenance of genome stability and plays a role in DNA repair, replication, transcription and telomere maintenance. This protein contains a N-terminal 3' to 5' exonuclease domain, an ATP-dependent helicase domain and RQC (RecQ helicase conserved region) domain in its central region, and a C-terminal HRDC (helicase RNase D C-terminal) domain and nuclear localization signal. Defects in this gene are the cause of Werner syndrome, an autosomal recessive disorder characterized by accelerated aging and an elevated risk for certain cancers. [provided by RefSeq, Aug 2017]

WRN Gene-Disease associations (from GenCC):

• Werner syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, G2P, Ambry Genetics
• osteosarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 8-31120338-T-TTA is Pathogenic according to our data. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-31120338-T-TTA is described in CliVar as Pathogenic. Clinvar id is 238140.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
WRN	NM_000553.6	c.2546_2547dupAT	p.Gln850IlefsTer27	frameshift_variant	Exon 21 of 35	ENST00000298139.7	NP_000544.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
WRN	ENST00000298139.7	c.2546_2547dupAT	p.Gln850IlefsTer27	frameshift_variant	Exon 21 of 35	1	NM_000553.6	ENSP00000298139.5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Werner syndrome Pathogenic:1

Aug 29, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in WRN are known to be pathogenic (PMID: 16673358). This variant has not been reported in the literature in individuals with WRN-related disease. ClinVar contains an entry for this variant (Variation ID: 238140). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln850Ilefs*27) in the WRN gene. It is expected to result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.6
Mutation Taster		=1/199	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs878854136; hg19: chr8-30977854;