rs121909553

Variant names:

• chr1-173914726-G-T
• rs121909547
• NM_000488.4:c.235C>A

Your query was ambiguous. Multiple possible variants found:

• chr1-173914726-G-T
• chr1-173914726-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PS4_Supporting PM2_Supporting PM5 PM1 PP3

This summary comes from the ClinGen Evidence Repository: The c.235C>A variant in SEPRINC1 is a missense variant predicted to cause substitution of arginine by serine at amino acid 79 (p.Arg79Ser). This variant has been reported in one family with an abnormal crossed immunoelectrophoresis assay demonstrating decreased antithrombin function. (PS4_Supporting; PMID:3350974). This variant is absent from gnomAD v[2.1.1] (PM2_Supporting). This variant resides within a region, Arg79, of SERPINC1 that is defined as a critical functional domain that would impact heparin binding site residues by the ClinGen Thrombosis Variant Curation Expert Panel (PM1). Another missense variant c.236G>A (p.Arg79His) (ClinVarID:18014) in the same codon has been classified as pathogenic for hereditary antithrombin deficiency by the ClinGen Thrombosis Variant Curation Expert Panel (PM5). The computational predictor REVEL gives a score of 0.718, which is above the threshold of 0.6, evidence that correlates with impact to SERPINC1 function (PP3). In summary, this variant meets the criteria to be classified as likely pathogenic for autosomal dominant hereditary antithrombin deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Thrombosis Variant Curation Expert Panel: PM1, PM5, PP3, PM2_Supporting, PS4_Supporting. (Required: ClinGen Thrombosis Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for SERPINC1 Version 1.0.0; date of approval) LINK:https://erepo.genome.network/evrepo/ui/classification/CA210760/MONDO:0013144/084

• Frequency: Genomes: not found (cov: 32)
• Consequence: SERPINC1 NM_000488.4 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 2.56

Genes affected

SERPINC1 (HGNC:775): (serpin family C member 1) The protein encoded by this gene, antithrombin III, is a plasma protease inhibitor and a member of the serpin superfamily. This protein inhibits thrombin as well as other activated serine proteases of the coagulation system, and it regulates the blood coagulation cascade. The protein includes two functional domains: the heparin binding-domain at the N-terminus of the mature protein, and the reactive site domain at the C-terminus. The inhibitory activity is enhanced by the presence of heparin. Numerous mutations have been identified for this gene, many of which are known to cause antithrombin-III deficiency which constitutes a strong risk factor for thrombosis. A reduction in the serum level of this protein is associated with severe cases of Coronavirus Disease 19 (COVID-19). [provided by RefSeq, Sep 2020]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SERPINC1	NM_000488.4	c.235C>A	p.Arg79Ser	missense_variant	Exon 2 of 7	ENST00000367698.4	NP_000479.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SERPINC1	ENST00000367698.4	c.235C>A	p.Arg79Ser	missense_variant	Exon 2 of 7	1	NM_000488.4	ENSP00000356671.3
SERPINC1	ENST00000494024.1	n.461C>A		non_coding_transcript_exon_variant	Exon 3 of 4	3
SERPINC1	ENST00000487183.1	n.-61C>A		upstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary antithrombin deficiency Pathogenic:2

May 09, 2024

Clingen Thrombosis Variant Curation Expert Panel, ClinGen

Significance: Likely pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

The c.235C>A variant in SEPRINC1 is a missense variant predicted to cause substitution of arginine by serine at amino acid 79 (p.Arg79Ser). This variant has been reported in one family with an abnormal crossed immunoelectrophoresis assay demonstrating decreased antithrombin function. (PS4_Supporting; PMID:3350974). This variant is absent from gnomAD v[2.1.1] (PM2_Supporting). This variant resides within a region, Arg79, of SERPINC1 that is defined as a critical functional domain that would impact heparin binding site residues by the ClinGen Thrombosis Variant Curation Expert Panel (PM1). Another missense variant c.236G>A (p.Arg79His) (ClinVarID:18014) in the same codon has been classified as pathogenic for hereditary antithrombin deficiency by the ClinGen Thrombosis Variant Curation Expert Panel (PM5). The computational predictor REVEL gives a score of 0.718, which is above the threshold of 0.6, evidence that correlates with impact to SERPINC1 function (PP3). In summary, this variant meets the criteria to be classified as likely pathogenic for autosomal dominant hereditary antithrombin deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Thrombosis Variant Curation Expert Panel: PM1, PM5, PP3, PM2_Supporting, PS4_Supporting. (Required: ClinGen Thrombosis Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for SERPINC1 Version 1.0.0; date of approval) -

Jun 18, 1990

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.49	.;T
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Benign	0.080	D
MetaRNN	Pathogenic	0.85	D;D
MetaSVM	Uncertain	0.29	D
MutationAssessor	Uncertain	2.2	.;M
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.8	.;N
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0040	.;D
Sift4G	Uncertain	0.016	D;D
Polyphen		1.0	.;D
Vest4		0.94
MutPred		0.72		Gain of phosphorylation at R79 (P = 0.0519);Gain of phosphorylation at R79 (P = 0.0519);
MVP		0.96
MPC		1.2
ClinPred		0.97	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.94
gMVP		0.91

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: rs121909547; hg19: chr1-173883864;