rs677

Variant names:

• chr1-173907423-C-A
• rs677
• NM_000488.4:c.1218+27G>T

Your query was ambiguous. Multiple possible variants found:

• chr1-173907423-C-A
• chr1-173907423-C-G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000488.4(SERPINC1):​c.1218+27G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,416,486 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: SERPINC1 NM_000488.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.64
• Publications: 0 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: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.97).

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.1218+27G>T		intron	N/A	NP_000479.1
	SERPINC1	NM_001386302.1		c.1341+27G>T		intron	N/A	NP_001373231.1
	SERPINC1	NM_001386303.1		c.1299+27G>T		intron	N/A	NP_001373232.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SERPINC1	ENST00000367698.4	TSL:1 MANE Select	c.1218+27G>T		intron	N/A	ENSP00000356671.3
	SERPINC1	ENST00000874328.1		c.1347+27G>T		intron	N/A	ENSP00000544387.1
	SERPINC1	ENST00000874324.1		c.1341+27G>T		intron	N/A	ENSP00000544383.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.06e-7 AC: 1 AN: 1416486 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 707396

African (AFR) AF: 0.00 AC: 0 AN: 32520

American (AMR) AF: 0.00 AC: 0 AN: 44668

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25906

East Asian (EAS) AF: 0.00 AC: 0 AN: 39484

South Asian (SAS) AF: 0.00 AC: 0 AN: 85330

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5674

European-Non Finnish (NFE) AF: 9.34e-7 AC: 1 AN: 1070610

Other (OTH) AF: 0.00 AC: 0 AN: 58920

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
CADD	Benign	0.019
DANN	Benign	0.58
PhyloP100		-1.6

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

Other links and lift over

dbSNP: rs677; hg19: chr1-173876561;