8-31068282-T-A

Position:

• chr8-31068282-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.679T>A​(p.Leu227Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: WRN NM_000553.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.33

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, 0.857

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
WRN	NM_000553.6	c.679T>A	p.Leu227Ile	missense_variant	7/35	ENST00000298139.7	NP_000544.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
WRN	ENST00000298139.7	c.679T>A	p.Leu227Ile	missense_variant	7/35	1	NM_000553.6	ENSP00000298139	P1
WRN	ENST00000650667.1	c.*293T>A		3_prime_UTR_variant, NMD_transcript_variant	6/34			ENSP00000498593
WRN	ENST00000651642.1			upstream_gene_variant				ENSP00000498779

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.072	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.12	T
Eigen	Benign	0.077
Eigen_PC	Benign	-0.085
FATHMM_MKL	Benign	0.72	D
LIST_S2	Benign	0.62	T
M_CAP	Benign	0.041	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Benign	-0.42	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	0.89	N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.0	N
REVEL	Uncertain	0.36
Sift	Uncertain	0.027	D
Sift4G	Uncertain	0.037	D
Polyphen		0.98	D
Vest4		0.43
MutPred		0.82		Loss of catalytic residue at L227 (P = 0.0929);
MVP		0.75
MPC		0.41
ClinPred		0.76	D
GERP RS		1.1
Varity_R		0.53
gMVP		0.28

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1554519443; hg19: chr8-30925798;