rs745579260

Positions:

• chr3-93927335-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The ENST00000394236.9(PROS1):​c.149A>C​(p.Lys50Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000041 in 1,461,794 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. K50E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: PROS1 ENST00000394236.9 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.46

Genes affected

PROS1 (HGNC:9456): (protein S) This gene encodes a vitamin K-dependent plasma protein that functions as a cofactor for the anticoagulant protease, activated protein C (APC) to inhibit blood coagulation. It is found in plasma in both a free, functionally active form and also in an inactive form complexed with C4b-binding protein. Mutations in this gene result in autosomal dominant hereditary thrombophilia. An inactive pseudogene of this locus is located at an adjacent region on chromosome 3. Alternative splicing results in multiple transcript variants encoding different isoforms that may undergo similar processing to generate mature protein. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a domain Gla (size 45) in uniprot entity PROS_HUMAN there are 12 pathogenic changes around while only 0 benign (100%) in ENST00000394236.9
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.797

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PROS1	NM_000313.4	c.149A>C	p.Lys50Thr	missense_variant	2/15	ENST00000394236.9	NP_000304.2
PROS1	NM_001314077.2	c.245A>C	p.Lys82Thr	missense_variant	3/16		NP_001301006.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PROS1	ENST00000394236.9	c.149A>C	p.Lys50Thr	missense_variant	2/15	1	NM_000313.4	ENSP00000377783	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000199 AC: 5 AN: 251422 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135894

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000272

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461794 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727200

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000101

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Thrombophilia due to protein S deficiency, autosomal dominant;C3281092:Thrombophilia due to protein S deficiency, autosomal recessive Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Juno Genomics, Hangzhou Juno Genomics, Inc

-

PM2_Supporting -

Thrombophilia due to protein S deficiency, autosomal recessive Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 25, 2016

This sequence change replaces lysine with threonine at codon 50 of the PROS1 protein (p.Lys50Thr). The lysine residue is highly conserved and there is a moderate physicochemical difference between lysine and threonine. This variant is present in population databases (rs745579260, ExAC 0.02%) but has not been reported in the literature in individuals with a PROS1-related disease. 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, this variant is a rare missense change with uncertain impact on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Uncertain	0.029	T
BayesDel_noAF	Uncertain	0.10
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;.;.;D;.;.
Eigen	Uncertain	0.20
Eigen_PC	Benign	0.098
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.73	.;T;T;T;T;T
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.80	D;D;D;D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	3.0	M;.;.;M;.;.
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.51	T
PROVEAN	Pathogenic	-4.8	D;.;.;.;.;.
REVEL	Pathogenic	0.74
Sift	Uncertain	0.0020	D;.;.;.;.;.
Sift4G	Uncertain	0.0050	D;.;.;.;.;.
Polyphen		0.98	D;.;.;D;.;.
Vest4		0.62
MutPred		0.67		Loss of ubiquitination at K50 (P = 0.0039);.;.;Loss of ubiquitination at K50 (P = 0.0039);Loss of ubiquitination at K50 (P = 0.0039);Loss of ubiquitination at K50 (P = 0.0039);
MVP		0.97
MPC		0.90
ClinPred		0.89	D
GERP RS		2.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.48
gMVP		0.73

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: rs745579260; hg19: chr3-93646179;