chr1-173909724-T-A

Variant names:

• chr1-173909724-T-A
• rs5877
• NM_000488.4:c.981A>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_000488.4(SERPINC1):​c.981A>T​(p.Val327Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. V327V) has been classified as Benign. The gene SERPINC1 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SERPINC1 NM_000488.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.06
• Publications: 43 publications found

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 Gene-Disease associations (from GenCC):

• hereditary antithrombin deficiency

  Inheritance: AD, AR, SD Classification: DEFINITIVE, STRONG, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia, Genomics England PanelApp, Orphanet, ClinGen

ACMG classification

Specifications for SERPINC1 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.47).
• BP7: Synonymous conserved (PhyloP=2.06 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000488.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SERPINC1	NM_000488.4	MANE Select	c.981A>T	p.Val327Val	synonymous	Exon 5 of 7	NP_000479.1	P01008
	SERPINC1	NM_001386302.1		c.1104A>T	p.Val368Val	synonymous	Exon 5 of 7	NP_001373231.1
	SERPINC1	NM_001386303.1		c.1062A>T	p.Val354Val	synonymous	Exon 6 of 8	NP_001373232.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SERPINC1	ENST00000367698.4	TSL:1 MANE Select	c.981A>T	p.Val327Val	synonymous	Exon 5 of 7	ENSP00000356671.3	P01008
	SERPINC1	ENST00000874328.1		c.1110A>T	p.Val370Val	synonymous	Exon 5 of 7	ENSP00000544387.1
	SERPINC1	ENST00000874324.1		c.1104A>T	p.Val368Val	synonymous	Exon 5 of 7	ENSP00000544383.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 47

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 23493

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
CADD	Benign	7.5
DANN	Benign	0.48
PhyloP100		2.1
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs5877; hg19: chr1-173878862;