8-31088941-A-G

Position:

• chr8-31088941-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000553.6(WRN):​c.1628A>G​(p.Tyr543Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,459,230 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: WRN NM_000553.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.90

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
WRN	NM_000553.6	c.1628A>G	p.Tyr543Cys	missense_variant	13/35	ENST00000298139.7	NP_000544.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
WRN	ENST00000298139.7	c.1628A>G	p.Tyr543Cys	missense_variant	13/35	1	NM_000553.6	ENSP00000298139.5
WRN	ENST00000521620.5	n.329A>G		non_coding_transcript_exon_variant	2/23	1
WRN	ENST00000650667.1	n.*1242A>G		non_coding_transcript_exon_variant	12/34			ENSP00000498593.1
WRN	ENST00000650667.1	n.*1242A>G		3_prime_UTR_variant	12/34			ENSP00000498593.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459230 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 725836

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Werner syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 14, 2020

This sequence change replaces tyrosine with cysteine at codon 543 of the WRN protein (p.Tyr543Cys). The tyrosine residue is moderately conserved and there is a large physicochemical difference between tyrosine and cysteine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with WRN-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: Not Available; PolyPhen-2: Probably Damaging; Align-GVGD: Not Available). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.038	D
MetaRNN	Uncertain	0.64	D
MetaSVM	Benign	-0.56	T
MutationAssessor	Benign	2.0	M
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-6.6	D
REVEL	Benign	0.24
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0050	D
Polyphen		1.0	D
Vest4		0.65
MutPred		0.46		Gain of methylation at K541 (P = 0.07);
MVP		0.74
MPC		0.44
ClinPred		0.99	D
GERP RS		4.3
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.0
Varity_R		0.80
gMVP		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: rs151001436; hg19: chr8-30946457;