rs758087836

Positions:

chr1-173909900-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3_StrongPP5

The NM_000488.4(SERPINC1):c.805G>A(p.Glu269Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,614,084 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

SERPINC1
NM_000488.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:1

Conservation

PhyloP100: 3.07

Variant links:

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]

SERPINC1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.954

PP5

Variant 1-173909900-C-T is Pathogenic according to our data. Variant chr1-173909900-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 410383.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SERPINC1	NM_000488.4 linkuse as main transcript	c.805G>A	p.Glu269Lys	missense_variant	5/7	ENST00000367698.4	NP_000479.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SERPINC1	ENST00000367698.4 linkuse as main transcript	c.805G>A	p.Glu269Lys	missense_variant	5/7	1	NM_000488.4	ENSP00000356671	P1
SERPINC1	ENST00000487183.1 linkuse as main transcript	n.456G>A		non_coding_transcript_exon_variant	4/4	2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152254

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000798

AC:

AN:

250712

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135524

show subpopulations

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000267

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.0000261

AC XY:

AN XY:

727228

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000342

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74386

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000278

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Dec 30, 2022

PP1, PM1, PM2, PS4_supporting -

Hereditary antithrombin deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 31, 2016

This sequence change replaces glutamic acid with lysine at codon 269 of the SERPINC1 protein (p.Glu269Lys). The glutamic acid residue is moderately conserved and there is a small physicochemical difference between glutamic acid and lysine. This variant is present in population databases (rs758087836, ExAC 0.003%). This variant has been reported in a 37 year old male with cerebellar venous infarct, deep vein thrombosis, and pulmonary emboli and recovered following treatment with antithrombin III (AT-III) concentrate. Family studies showed that this variant segregated in three individuals with reduced concentrations of AT-III plus venous thromboembolism (VTE), one individual with reduced AT-III concentrations but no VTE, and an unaffected 17 year old female family member (PMID: 1430264). This variant is also known as 237 Glu to Lys or Truro variant in the literature. Experimental studies have shown that this missense change alters heparin pentasaccharide affinity and binding kinetics in vitro suggesting that this amino acid residue is important for protein function (PMID: 10966821, 16973611). In summary, this missense change has been reported to alter binding to heparin in vitro and segregates in a family with history of venous thromboembolism. However, this variant is also present in population databases and without additional functional and/or genetic data, this change has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.24

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Uncertain

0.10

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.56

Eigen

Benign

-0.16

Eigen_PC

Benign

-0.14

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.85

M_CAP

Uncertain

0.13

MetaRNN

Pathogenic

0.95

MetaSVM

Uncertain

-0.21

MutationAssessor

Benign

1.3

MutationTaster

Benign

1.0

PrimateAI

Benign

0.46

PROVEAN

Benign

-1.6

REVEL

Uncertain

0.50

Sift

Benign

0.30

Sift4G

Benign

0.83

Polyphen

0.17

Vest4

0.73

MutPred

0.77

Loss of ubiquitination at K268 (P = 0.0074);

MVP

0.98

MPC

0.84

ClinPred

0.50

GERP RS

5.5

Varity_R

0.64

gMVP

0.69

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over