rs281875299

Variant names:

• chr9-133440344-C-T
• rs281875299
• NM_139027.6:c.1787C>T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_139027.6(ADAMTS13):​c.1787C>T​(p.Ala596Val) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000753 in 1,461,632 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: ADAMTS13 NM_139027.6 missense, splice_region
• Scores: Splicing: ADA: 0.9957
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 4.82

Genes affected

ADAMTS13 (HGNC:1366): (ADAM metallopeptidase with thrombospondin type 1 motif 13) This gene encodes a member of a family of proteins containing several distinct regions, including a metalloproteinase domain, a disintegrin-like domain, and a thrombospondin type 1 (TS) motif. The enzyme encoded by this gene specifically cleaves von Willebrand Factor (vWF). Defects in this gene are associated with thrombotic thrombocytopenic purpura. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a region_of_interest Spacer (size 129) in uniprot entity ATS13_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_139027.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964
• PP5: Variant 9-133440344-C-T is Pathogenic according to our data. Variant chr9-133440344-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 68805.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-133440344-C-T is described in UniProt as null. Variant chr9-133440344-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADAMTS13	NM_139027.6	c.1787C>T	p.Ala596Val	missense_variant, splice_region_variant	Exon 16 of 29	ENST00000355699.7	NP_620596.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ADAMTS13	ENST00000355699.7	c.1787C>T	p.Ala596Val	missense_variant, splice_region_variant	Exon 16 of 29	1	NM_139027.6	ENSP00000347927.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000119 AC: 3 AN: 251126 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135838

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000753 AC: 11 AN: 1461632 Hom.: 0 Cov.: 36 AF XY: 0.00000963 AC XY: 7 AN XY: 727108

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000812

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 12, 2023	ClinVar contains an entry for this variant (Variation ID: 68805). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 596 of the ADAMTS13 protein (p.Ala596Val). This variant is present in population databases (rs281875299, gnomAD 0.01%). This missense change has been observed in individual(s) with thrombotic thrombocytopenic purpura (PMID: 15009458, 22783805, 28678087, 30312976, 31064749, 32496441). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Experimental studies have shown that this missense change affects ADAMTS13 function (PMID: 17849048, 22783805). For these reasons, this variant has been classified as Pathogenic. -
not provided, no classification provided	literature only	UniProtKB/Swiss-Prot	-	- -

Thrombotic thrombocytopenic purpura Pathogenic:1

Pathogenic, criteria provided, single submitter

research

NIHR Bioresource Rare Diseases, University of Cambridge

Feb 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.75
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.54	D;T;.;.
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.91	D;D;D;D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Uncertain	0.38	D
MutationAssessor	Pathogenic	3.3	M;.;M;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-3.8	D;.;D;D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0020	D;.;D;D
Sift4G	Uncertain	0.0030	D;D;D;.
Polyphen		1.0	D;.;D;D
Vest4		0.78
MutPred		0.80		Gain of MoRF binding (P = 0.1253);.;Gain of MoRF binding (P = 0.1253);.;
MVP		0.92
MPC		1.1
ClinPred		0.95	D
GERP RS		5.2
Varity_R		0.22
gMVP		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.83
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: rs281875299; hg19: chr9-136305465; COSMIC: COSV63021386;