rs1554519439

chr8-31068273-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000553.6(WRN):c.670T>A(p.Tyr224Asn) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y224C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: WRN NM_000553.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.59

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.898

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
WRN	NM_000553.6	c.670T>A	p.Tyr224Asn	missense_variant	7/35	ENST00000298139.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
WRN	ENST00000298139.7	c.670T>A	p.Tyr224Asn	missense_variant	7/35	1	NM_000553.6	P1
WRN	ENST00000650667.1	c.*284T>A		3_prime_UTR_variant, NMD_transcript_variant	6/34
WRN	ENST00000651642.1			upstream_gene_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

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

Invitae

Nov 02, 2018

Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: Deleterious; PolyPhen-2: Probably Damaging; Align-GVGD: Class C0). 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. This variant has not been reported in the literature in individuals with WRN-related disease. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces tyrosine with asparagine at codon 224 of the WRN protein (p.Tyr224Asn). The tyrosine residue is highly conserved and there is a large physicochemical difference between tyrosine and asparagine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
Cadd	Uncertain	24
Dann	Uncertain	0.98
DEOGEN2	Uncertain	0.60	D
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.89	D
M_CAP	Benign	0.062	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.19	D
MutationAssessor	Pathogenic	3.6	H
MutationTaster	Benign	0.99	D
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-4.9	D
REVEL	Uncertain	0.48
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.12	T
Polyphen		1.0	D
Vest4		0.82
MutPred		0.73		Loss of catalytic residue at I223 (P = 0.0989);
MVP		0.87
MPC		0.50
ClinPred		0.98	D
GERP RS		3.8
Varity_R		0.93
gMVP		0.70

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: rs1554519439; hg19: chr8-30925789;