12-6019478-C-G

Position:

• chr12-6019478-C-G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PP4_Moderate PM2_Supporting PS2_Moderate PS3 PS4_Moderate

This summary comes from the ClinGen Evidence Repository: The NM_000552.5(VWF):c.3940G>C (p.Val1314Leu) missense variant has been reported in at least 3 probands with VWD 2B phenotypes (PS4_moderate; PMIDs: 1419803, 27215777, ISTH 2015 Congress Poster). At least one proband displayed excessive mucocutaneous bleeding as well as a laboratory phenotypes of loss of high molecular weight multimers and an increased response to LD-RIPA showing gain of function, which together are highly specific for VWD type 2B (PP4_moderate; PMID:1419803). The variant was identified as a de novo occurrence in this patient (PS2_Moderate; PMIDs: 1419803). This variant is absent from gnomAD v4.1 (PM2_Supporting). A Platelet binding assay performed with the Val1314Leu recombinant mutant vWF expressed by COS-7 showed increased binding in the absence of, or at low doses, of ristocetin, indicating that this variant has a gain of function effect on the protein (PMID:8630394; PS3). In summary, the variant meets the criteria to be classified as Likely Pathogenic for von Willebrand disease type 2B based on the ACMG/AMP criteria applied, as specified by the ClinGen VWD VCEP: PS3, PS4_moderate, PS2_Moderate, PP4_moderate, and PM2_supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA114151/MONDO:0015629/081

• Frequency: Genomes: not found (cov: 32)
• Consequence: VWF NM_000552.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 4.20

Genes affected

VWF (HGNC:12726): (von Willebrand factor) This gene encodes a glycoprotein involved in hemostasis. The encoded preproprotein is proteolytically processed following assembly into large multimeric complexes. These complexes function in the adhesion of platelets to sites of vascular injury and the transport of various proteins in the blood. Mutations in this gene result in von Willebrand disease, an inherited bleeding disorder. An unprocessed pseudogene has been found on chromosome 22. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
VWF	NM_000552.5	c.3940G>C	p.Val1314Leu	missense_variant	28/52	ENST00000261405.10
VWF	XM_047429501.1	c.3940G>C	p.Val1314Leu	missense_variant	28/52

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
VWF	ENST00000261405.10	c.3940G>C	p.Val1314Leu	missense_variant	28/52	1	NM_000552.5	P1
VWF	ENST00000538635.5	n.421-25544G>C		intron_variant, non_coding_transcript_variant		4
VWF	ENST00000539641.1			downstream_gene_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 38

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Von Willebrand disease type 2B Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 01, 2010

- -

not provided Other:1

not provided, no classification provided

literature only

Academic Unit of Haematology, University of Sheffield

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.44	T
Eigen	Benign	-0.094
Eigen_PC	Benign	0.011
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.50	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Uncertain	-0.25	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	0.75	N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.98	N
REVEL	Uncertain	0.60
Sift	Benign	0.034	D
Sift4G	Uncertain	0.017	D
Polyphen		0.0060	B
Vest4		0.22
MutPred		0.80		Loss of sheet (P = 0.0457);
MVP		0.76
MPC		0.27
ClinPred		0.29	T
GERP RS		3.8
Varity_R		0.25
gMVP		0.66

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: rs61749393; hg19: chr12-6128644;